L2SM Working Group B. Wen Internet-Draft Comcast Intended status: Standards Track G. Fioccola, Ed. Expires: August 23, 2018 Telecom Italia C. Xie China Telecom L. Jalil Verizon February 19, 2018 A YANG Data Model for L2VPN Service Delivery draft-ietf-l2sm-l2vpn-service-model-07 Abstract This document defines a YANG data model that can be used to configure a Layer 2 Provider Provisioned VPN service. This model is intended to be instantiated at management system to deliver the overall service. This model is not a configuration model to be used directly on network elements, but provides an abstracted view of the Layer 2 VPN service configuration components. It is up to a management system to take this as an input and generate specific configurations models to configure the different network elements to deliver the service. How configuration of network elements is done is out of scope of the document. The data model in this document includes support for point-to-point Virtual Private Wire Services (VPWS) and multipoint Virtual Private LAN services (VPLS) that use Pseudowires signaled using the Label Distribution Protocol (LDP) and the Border Gateway Protocol (BGP) as described in RFC4761 and RFC6624. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." Wen, et al. Expires August 23, 2018 [Page 1] Internet-Draft L2VPN Service Model February 2018 This Internet-Draft will expire on August 23, 2018. Copyright Notice Copyright (c) 2018 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4 1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 4 1.1.1. Requirements Language . . . . . . . . . . . . . . . . 5 1.2. Tree diagram . . . . . . . . . . . . . . . . . . . . . . 5 2. Definitions . . . . . . . . . . . . . . . . . . . . . . . . . 5 3. The Layer 2 VPN Service Model . . . . . . . . . . . . . . . . 7 3.1. Layer 2 VPN Service Types . . . . . . . . . . . . . . . . 7 3.2. Layer 2 VPN Physical Network Topology . . . . . . . . . . 8 4. Service Data Model Usage . . . . . . . . . . . . . . . . . . 9 5. Design of the Data Model . . . . . . . . . . . . . . . . . . 11 5.1. Features and Augmentation . . . . . . . . . . . . . . . . 21 5.2. VPN Service Overview . . . . . . . . . . . . . . . . . . 21 5.2.1. VPN Service Type . . . . . . . . . . . . . . . . . . 22 5.2.2. VPN Service Topology . . . . . . . . . . . . . . . . 22 5.2.2.1. Route Target Allocation . . . . . . . . . . . . . 23 5.2.2.2. Any-to-Any . . . . . . . . . . . . . . . . . . . 23 5.2.2.3. Hub-and-Spoke . . . . . . . . . . . . . . . . . . 23 5.2.2.4. Hub-and-Spoke-Disjoint . . . . . . . . . . . . . 24 5.2.3. Cloud Access . . . . . . . . . . . . . . . . . . . . 24 5.2.4. Extranet VPNs . . . . . . . . . . . . . . . . . . . . 27 5.2.5. Frame Delivery Service . . . . . . . . . . . . . . . 29 5.3. Site Overview . . . . . . . . . . . . . . . . . . . . . . 30 5.3.1. Devices and Locations . . . . . . . . . . . . . . . . 31 5.3.2. Site Network Accesses . . . . . . . . . . . . . . . . 32 5.3.2.1. Bearer . . . . . . . . . . . . . . . . . . . . . 33 5.3.2.2. Connection . . . . . . . . . . . . . . . . . . . 33 5.4. Site Role . . . . . . . . . . . . . . . . . . . . . . . . 38 5.5. Site Belonging to Multiple VPNs . . . . . . . . . . . . . 38 5.5.1. Site VPN Flavor . . . . . . . . . . . . . . . . . . . 38 Wen, et al. Expires August 23, 2018 [Page 2] Internet-Draft L2VPN Service Model February 2018 5.5.1.1. Single VPN Attachment: site-vpn-flavor-single . . 38 5.5.1.2. MultiVPN Attachment: site-vpn-flavor-multi . . . 39 5.5.1.3. NNI: site-vpn-flavor-nni . . . . . . . . . . . . 39 5.5.1.4. E2E: site-vpn-flavor-e2e . . . . . . . . . . . . 40 5.5.2. Attaching a Site to a VPN . . . . . . . . . . . . . . 41 5.5.2.1. Referencing a VPN . . . . . . . . . . . . . . . . 41 5.5.2.2. VPN Policy . . . . . . . . . . . . . . . . . . . 43 5.6. Deciding Where to Connect the Site . . . . . . . . . . . 48 5.6.1. Constraint: Device . . . . . . . . . . . . . . . . . 48 5.6.2. Constraint/Parameter: Site Location . . . . . . . . . 49 5.6.3. Constraint/Parameter: Access Type . . . . . . . . . . 50 5.6.4. Constraint: Access Diversity . . . . . . . . . . . . 51 5.7. Route Distinguisher and Network Instance Allocation . . . 52 5.8. Site Network Access Availability . . . . . . . . . . . . 53 5.9. SVC MTU . . . . . . . . . . . . . . . . . . . . . . . . . 54 5.10. Service . . . . . . . . . . . . . . . . . . . . . . . . . 55 5.10.1. Bandwidth . . . . . . . . . . . . . . . . . . . . . 55 5.10.2. QoS . . . . . . . . . . . . . . . . . . . . . . . . 56 5.10.2.1. QoS Classification . . . . . . . . . . . . . . . 56 5.10.2.2. QoS Profile . . . . . . . . . . . . . . . . . . 57 5.10.3. Broadcast Multicast Unknow Unicast Support . . . . . 58 5.11. Site Management . . . . . . . . . . . . . . . . . . . . . 59 5.12. MAC Loop Protection . . . . . . . . . . . . . . . . . . . 59 5.13. MAC Address Limit . . . . . . . . . . . . . . . . . . . . 60 5.14. Enhanced VPN Features . . . . . . . . . . . . . . . . . . 60 5.14.1. Carriers' Carriers . . . . . . . . . . . . . . . . . 60 5.15. External ID References . . . . . . . . . . . . . . . . . 62 5.16. Defining NNIs and Inter-AS support . . . . . . . . . . . 62 5.16.1. Defining an NNI with the Option A Flavor . . . . . . 63 5.16.2. Defining an NNI with the Option B Flavor . . . . . . 67 5.16.3. Defining an NNI with the Option C Flavor . . . . . . 69 5.17. Applicability of L2SM model in Inter-Provider and Inter- Domain Orchestration . . . . . . . . . . . . . . . . . . 71 6. Interaction with Other YANG Modules . . . . . . . . . . . . . 72 7. Service Model Usage Example . . . . . . . . . . . . . . . . . 73 8. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 80 9. Security Considerations . . . . . . . . . . . . . . . . . . . 154 10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 155 11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 155 12. References . . . . . . . . . . . . . . . . . . . . . . . . . 156 12.1. Normative References . . . . . . . . . . . . . . . . . . 156 12.2. Informative References . . . . . . . . . . . . . . . . . 157 Appendix A. Changes Log . . . . . . . . . . . . . . . . . . . . 158 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 162 Wen, et al. Expires August 23, 2018 [Page 3] Internet-Draft L2VPN Service Model February 2018 1. Introduction This document defines a YANG data model for Layer 2 VPN (L2VPN) service configuration. This model is intended to be instantiated at management system to allow a user (a customer or an application) to request the service from a service provider. This model is not a configuration model to be used directly on network elements, but provides an abstracted view of the L2VPN service configuration components. It is up to a management system to take this as an input and generate specific configurations models to configure the different network elements to deliver the service. How configuration of network elements is done is out of scope of the document. The data model in this document includes support for point-to-point Virtual Private Wire Services (VPWS) and multipoint Virtual Private LAN services (VPLS) that use Pseudowires signaled using the Label Distribution Protocol (LDP) and the Border Gateway Protocol (BGP) as described in [RFC4761] and [RFC6624]. Further discussion of the way that services are modeled in YANG and the relationship between "customer service models" like the one described in this document and configuration models can be found in [RFC8309] and [RFC8199]. Section 4 and Section 6 also provide more information of how this service model could be used and how it fits into the overall modeling architecture. 1.1. Terminology The following terms are defined in [RFC6241] and are not redefined here: o client o configuration data o server o state data The following terms are defined in [RFC6020] and are not redefined here: o augment o data model o data node Wen, et al. Expires August 23, 2018 [Page 4] Internet-Draft L2VPN Service Model February 2018 The terminology for describing YANG data models is found in [RFC6020]. 1.1.1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 1.2. Tree diagram A simplified graphical representation of the data model is presented in Section 5. The meaning of the symbols in these diagrams is as follows: o Brackets "[" and "]" enclose list keys. o Curly braces "{" and "}" contain names of optional features that make the corresponding node conditional. o Abbreviations before data node names: "rw" means configuration (read-write), and "ro" state data (read-only). o Symbols after data node names: "?" means an optional node and "*" denotes a "list" or "leaf-list". o Parentheses enclose choice and case nodes, and case nodes are also marked with a colon (":"). o Ellipsis ("...") stands for contents of subtrees that are not shown. 2. Definitions This document uses the following terms: Service Provider (SP): The organization (usually a commercial undertaking) responsible for operating the network that offers VPN services to clients and customers. Customer Edge (CE) Device: Equipment that is dedicated to a particular customer and is directly connected to one or more PE devices via attachment circuits. A CE is usually located at the customer premises, and is usually dedicated to a single VPN, although it may support multiple VPNs if each one has separate Wen, et al. Expires August 23, 2018 [Page 5] Internet-Draft L2VPN Service Model February 2018 attachment circuits. The CE devices can be routers, bridges, switches, or hosts. Provider Edge (PE) Device: Equipment managed by the SP that can support multiple VPNs for different customers, and is directly connected to one or more CE devices via attachment circuits. A PE is usually located at an SP point of presence (PoP) and is managed by the SP. Virtual Private LAN Service (VPLS): A VPLS is a provider service that emulates the full functionality of a traditional Local Area Network (LAN). A VPLS makes it possible to interconnect several LAN segments over a packet switched network (PSN) and makes the remote LAN segments behave as one single LAN. Virtual Private Wire Service (VPWS): A VPWS is a point-to-point circuit (i.e., link) connecting two CE devices. The link is established as a logical through a packet switched network. The CE in the customer network is connected to a PE in the provider network via an Attachment Circuit (AC): the AC is either a physical or a logical circuit. A VPWS differs from a VPLS in that the VPLS is point-to-multipoint, while the VPWS is point-to-point. In some implementations, a set of VPWSs is used to create a multi- site L2VPN network. Pseudowire(PW): A pseudowire is an emulation of a native service over a packet switched network (PSN). The native service may be ATM, frame relay, Ethernet, low-rate TDM, or SONET/SDH, while the PSN may be MPLS, IP (either IPv4 or IPv6), or L2TPv3. MAC-VRF: A Virtual Routing and Forwarding table for Media Access Control (MAC) addresses on a PE. It is sometime also referred to as a Virtual Switching Instance (VSI). UNI: User to Network Interface. The physical demarcation point between the responsibility of Customer and the responsibility of Provider. NNI: Network to Network Interface. A reference point representing the boundary between two Networks that are operated as separate administrative domains. The two networks may belong to the same provider or to two different providers. This document uses the following abbreviations: BSS: Business Support System B-U-M: Broadcast-UnknownUnicast-Multicast Wen, et al. Expires August 23, 2018 [Page 6] Internet-Draft L2VPN Service Model February 2018 CoS: Class of Service LAG: Link Aggregation Group LLDP: Link Level Discovery Protocol OAM: Operations, Administration, and Maintenance OSS: Operations Support System PDU: Protocol Data Unit QoS: Quality of Service 3. The Layer 2 VPN Service Model A Layer 2 VPN (L2VPN) service is a collection of sites that are authorized to exchange traffic between each other over a shared infrastructure of a common technology. This L2VPN service model (L2SM) provides a common understanding of how the corresponding L2VPN service is to be deployed over the shared infrastructure. This document presents the L2SM using the YANG data modeling language [RFC6020] as a formal language that is both human-readable and parsable by software for use with protocols such as NETCONF [RFC6241] and RESTCONF [RFC8040]. This service model is limited to VPWS and VPLS based VPNs as described in [RFC4761] and [RFC6624], EVPN as described in [RFC7432]. 3.1. Layer 2 VPN Service Types From a technology perspective, a set of basic L2VPN service types include: o Point-to-point Virtual Private Wire Services (VPWSs) that use LDP- signaled Psedowires or L2TP-signaled Psedowires [RFC6074]; o Multipoint Virtual Private LAN Services (VPLSs) that use LDP- signaled Pseudowires or L2TP-signaled Psedowires [RFC6074]; o Multipoint Virtual Private LAN Services (VPLSs) that use a Border Gateway Protocol (BGP) control plane as described in [RFC4761] and [RFC6624]; o IP-Only LAN-Like Services (IPLSs) that are a functional subset of VPLS services [RFC4664]; Wen, et al. Expires August 23, 2018 [Page 7] Internet-Draft L2VPN Service Model February 2018 o BGP MPLS-based Ethernet VPN Services as described in [RFC7432] and [RFC7209]; o Ethernet VPN VPWS specified in [RFC8214] and [RFC7432]; 3.2. Layer 2 VPN Physical Network Topology Figure 1 depicts a typical service provider's physical network topology. Most service providers have deployed an IP, MPLS, or Segment Routing (SR) multi-service core infrastructure. Ingress Layer 2 service frames will be mapped to either an Ethernet Pseudowire (PWE) or a VxLAN PE-to-PE tunnel. The details of these tunneling mechanism are at the provider's discretion and not part of the L2SM. An L2VPN provides end-to-end L2 connectivity over this multi-service core infrastructure between two or more customer locations or a collection of sites. Attachment Circuits are placed between CE devices and PE Devices that backhaul layer 2 service frames from the customer over the access network to the Provider Network or remote Site. The demarcation point (i.e., UNI) between the customer and service provider can be either placed between Customer nodes and the Customer Edge Device, or between the Customer Edge Device and the Provider Edge Device. The actual bearer connection between CE and PE will be described in the L2SM model. The service provider may also choose a Seamless MPLS approach to expand the PWE or VxLAN tunnel between sites. The service provider may leverage multi-protocol BGP to auto-discover and signal the PWE or VxLAN tunnel end points. Wen, et al. Expires August 23, 2018 [Page 8] Internet-Draft L2VPN Service Model February 2018 Site A | |Site B --- ---- | VXLAN/PW | --- | | | | |<------------------------>| | | | C +---+ CE | | | | C | | | | | | --------- | | | --- ----\ | ( ) | /--- \ -|-- ( ) -|-- ---- / \| | ( ) | | | |/ | PE +---+ IP/MPLS/SR +---+ PE +---+ CE | /| | ( Network ) | | | |\ / ---- ( ) ---- ---- \ --- ----/ ( ) \--- | | | | ----+---- | | | C +---+ CE | | | C | | | | | --+-- | | --- ---- | PE | --- --+-- | Site C --+-- | CE | --+-- | --+-- | C | ----- Figure 1: Reference Network for the Use of the L2VPN Service Model From the customer perspective, however, all the customer edge devices are connected over a simulated LAN environment as shown in Figure 2. Broadcast and multicast packets are sent to all participants in the same bridge domain. CE---+----+-----+---CE | | | | | | | | | CE---+ CE +---CE Figure 2: Customer View of the L2VPN 4. Service Data Model Usage The L2VPN service model provides an abstracted interface to request, configure, and manage the components of an L2VPN service. The model is used by a customer who purchases connectivity and other services from an SP to communicate with that SP. Wen, et al. Expires August 23, 2018 [Page 9] Internet-Draft L2VPN Service Model February 2018 A typical usage for this model is as an input to an orchestration layer that is responsible for translating it into configuration commands for the network elements that deliver/enable the service. The network elements may be routers, but also servers (like AAA) that are necessary within the network. The configuration of network elements may be done using the Command Line Interface (CLI), or any other configuration (or "southbound") interface such as NETCONF [RFC6241] in combination with device- specific and protocol-specific YANG models. This way of using the service model is illustrated in Figure 3 and described in more detail in [RFC8309] and [RFC8199]. The usage of this service model is not limited to this example: it can be used by any component of the management system, but not directly by network elements. The usage and structure of this model should be compared to the Layer 3 VPN service model defined in [RFC8299]. Wen, et al. Expires August 23, 2018 [Page 10] Internet-Draft L2VPN Service Model February 2018 ---------------------------- | Customer Service Requester | ---------------------------- | L2VPN | Service | Model | | ----------------------- | Service Orchestration | ----------------------- | | Service +-------------+ | Delivery +------>| Application | | Model | | BSS/OSS | | V +-------------+ ----------------------- | Network Orchestration | ----------------------- | | +----------------+ | | Config manager | | +----------------+ | Device | | Models | | -------------------------------------------- Network +++++++ + AAA + +++++++ ++++++++ Bearer ++++++++ ++++++++ ++++++++ + CE A + ----------- + PE A + + PE B + ---- + CE B + ++++++++ Connection ++++++++ ++++++++ ++++++++ Site A Site B Figure 3: Reference Architecture for the Use of the L2VPN Service Model 5. Design of the Data Model The L2SM model is structured in a way that allows the provider to list multiple circuits of various service types for the same customer. A circuit represents an end-to-end connection between two or more locations of Customers. Wen, et al. Expires August 23, 2018 [Page 11] Internet-Draft L2VPN Service Model February 2018 The YANG module is divided into two main containers: vpn-services and sites. The vpn-svc container under vpn-services defines global parameters for the VPN service for a specific customer. A site contains at least one network access (i.e., site network accesses providing access to the sites defined in Section 5.3.2) and there may be multiple network accesses in case of multihoming. The site to network access attachment is done through a bearer with a Layer 2 connection on top. The bearer refers to properties of the attachment that are below layer 2 while the connection refers to layer 2 protocol oriented properties. The bearer may be allocated dynamically by the service provider and the customer may provide some constraints or parameters to drive the placement. Authorization of traffic exchange is done through what we call a VPN policy or VPN topology defining routing exchange rules between sites. An end to end Multi-segment connectivity can be realized using a combination of per site connectivity and per segment connectivity at different segments. The figure below describe the overall structure of the YANG module: module: ietf-l2vpn-svc +--rw l2vpn-svc +--rw vpn-profiles | +--rw valid-provider-identifiers | +--rw cloud-identifier* [id] {cloud-access}? | | +--rw id string | +--rw qos-profile-identifier* [id] | | +--rw id string | +--rw bfd-profile-identifier* [id] | | +--rw id string | +--rw remote-carrier-identifier* [id] | +--rw id string +--rw vpn-services | +--rw vpn-service* [vpn-id] | +--rw vpn-id svc-id | +--rw svc-type? identityref | +--rw customer-name? string | +--rw svc-topo? identityref | +--rw cloud-accesses {cloud-access}? | | +--rw cloud-access* [cloud-identifier] | | +--rw cloud-identifier | | | -> /l2vpn-svc/vpn-profiles/ | | | valid-provider-identifiers/cloud-identifier/id | | +--rw (list-flavor)? | | +--:(permit-any) Wen, et al. Expires August 23, 2018 [Page 12] Internet-Draft L2VPN Service Model February 2018 | | | +--rw permit-any? empty | | +--:(deny-any-except) | | | +--rw permit-site* | | | : -> /l2vpn-svc/sites/site/site-id | | +--:(permit-any-except) | | +--rw deny-site* | | -> /l2vpn-svc/sites/site/site-id | +--rw frame-delivery {frame-delivery}? | | +--rw customer-tree-flavors | | | +--rw tree-flavor* identityref | | +--rw bum-frame-delivery | | | +--rw bum-frame-delivery* [frame-type] | | | +--rw frame-type identityref | | | +--rw delivery-mode? identityref | | +--rw multicast-gp-port-mapping identityref | +--rw extranet-vpns {extranet-vpn}? | | +--rw extranet-vpn* [vpn-id] | | +--rw vpn-id svc-id | | +--rw local-sites-role? identityref | +--rw ce-vlan-preservation boolean | +--rw ce-vlan-cos-perservation boolean | +--rw carrierscarrier? boolean {carrierscarrier}? +--rw sites +--rw site* [site-id] +--rw site-id string +--rw site-vpn-flavor? identityref +--rw devices | +--rw device* [device-id] | +--rw device-id string | +--rw location | | -> ../../../locations/location/location-id | +--rw management | +--rw transport? identityref | +--rw address? inet:ip-address +--rw locations | +--rw location* [location-id] | +--rw location-id string | +--rw address? string | +--rw zip-code? string | +--rw state? string | +--rw city? string | +--rw country-code? string +--rw management | +--rw type identityref +--rw site-diversity {site-diversity}? | +--rw groups | +--rw group* [group-id] | +--rw group-id string Wen, et al. Expires August 23, 2018 [Page 13] Internet-Draft L2VPN Service Model February 2018 +--rw vpn-policies | +--rw vpn-policy* [vpn-policy-id] | +--rw vpn-policy-id string | +--rw entries* [id] | +--rw id string | +--rw filters | | +--rw filter* [type] | | +--rw type identityref | | +--rw lan-tag* uint32 {lan-tag}? | +--rw vpn* [vpn-id] | +--rw vpn-id | | -> /l2vpn-svc/vpn-services/ | | vpn-service/vpn-id | +--rw site-role? identityref +--rw service | +--rw qos {qos}? | | +--rw classification-policy | | | +--rw rule* [id] | | | +--rw id string | | | +--rw (match-type)? | | | | +--:(match-flow) | | | | | +--rw match-flow | | | | | +--rw dscp? inet:dscp | | | | | +--rw dot1q? uint16 | | | | | +--rw pcp? uint8 | | | | | +--rw src-mac? yang:mac-address | | | | | +--rw dst-mac? yang:mac-address | | | | | +--rw color-type? identityref | | | | | +--rw target-sites* | | | | | | svc-id {target-sites}? | | | | | +--rw any? empty | | | | | +--rw vpn-id? svc-id | | | | +--:(match-application) | | | | +--rw match-application? identityref | | | +--rw target-class-id? string | | +--rw qos-profile | | +--rw (qos-profile)? | | +--:(standard) | | | +--rw profile? | | | -> /l2vpn-svc/vpn-profiles/ | | | valid-provider-identifiers/ | | | qos-profile-identifier/id | | +--:(custom) | | +--rw classes {qos-custom}? | | +--rw class* [class-id] | | +--rw class-id string | | +--rw direction? identityref | | +--rw policing? identityref Wen, et al. Expires August 23, 2018 [Page 14] Internet-Draft L2VPN Service Model February 2018 | | +--rw byte-offset? uint16 | | +--rw frame-delay | | | +--rw (flavor)? | | | +--:(lowest) | | | | +--rw use-lowest-latency? empty | | | +--:(boundary) | | | +--rw delay-bound? uint16 | | +--rw frame-jitter | | | +--rw (flavor)? | | | +--:(lowest) | | | | +--rw use-lowest-jitter? empty | | | +--:(boundary) | | | +--rw delay-bound? uint32 | | +--rw frame-loss | | | +--rw rate? decimal64 | | +--rw bandwidth | | +--rw guaranteed-bw-percent decimal64 | | +--rw end-to-end? empty | +--rw carrierscarrier {carrierscarrier}? | +--rw signaling-type? identityref +--rw broadcast-unknown-unicast-multicast {bum}? | +--rw multicast-site-type? enumeration | +--rw multicast-gp-address-mapping* [id] | | +--rw id uint16 | | +--rw vlan-id uint16 | | +--rw mac-gp-address yang:mac-address | | +--rw port-lag-number? uint32 | +--rw bum-overall-rate? uint32 | +--rw bum-rate-per-type* [type] | +--rw type identityref | +--rw rate? uint32 +--rw mac-loop-prevention {mac-loop-prevention}? | +--rw protection-type? identityref | +--rw frequency? uint32 | +--rw retry-timer? uint32 +--rw access-control-list | +--rw mac* [mac-address] | +--rw mac-address yang:mac-address +--ro actual-site-start? yang:date-and-time +--ro actual-site-stop? yang:date-and-time +--rw bundling-type? identityref +--rw default-ce-vlan-id uint32 +--rw site-network-accesses +--rw site-network-access* [network-access-id] +--rw network-access-id string +--rw remote-carrier-name? string +--rw type? identityref +--rw (location-flavor) Wen, et al. Expires August 23, 2018 [Page 15] Internet-Draft L2VPN Service Model February 2018 | +--:(location) | | +--rw location-reference? | | -> ../../../locations/location/ | | location-id | +--:(device) | +--rw device-reference? | -> ../../../devices/device/device-id +--rw access-diversity {site-diversity}? | +--rw groups | | +--rw group* [group-id] | | +--rw group-id string | +--rw constraints | +--rw constraint* [constraint-type] | +--rw constraint-type identityref | +--rw target | +--rw (target-flavor)? | +--:(id) | | +--rw group* [group-id] | | +--rw group-id string | +--:(all-accesses) | | +--rw all-other-accesses? empty | +--:(all-groups) | +--rw all-other-groups? empty +--rw bearer | +--rw requested-type {requested-type}? | | +--rw type? string | | +--rw strict? boolean | +--rw always-on? boolean {always-on}? | +--rw bearer-reference? string {bearer-reference}? +--rw connection | +--rw encapsulation-type? identityref | +--rw eth-inf-type? identityref | +--rw tagged-interface | | +--rw type? identityref | | +--rw dot1q-vlan-tagged {dot1q}? | | | +--rw tg-type? identityref | | | +--rw cvlan-id uint16 | | +--rw priority-tagged | | | +--rw tag-type? identityref | | +--rw qinq {qinq}? | | | +--rw tag-type? identityref | | | +--rw svlan-id uint16 | | | +--rw cvlan-id uint16 | | +--rw qinany {qinany}? | | | +--rw tag-type? identityref | | | +--rw svlan-id uint16 | | +--rw vxlan {vxlan}? | | +--rw vni-id uint32 Wen, et al. Expires August 23, 2018 [Page 16] Internet-Draft L2VPN Service Model February 2018 | | +--rw peer-mode? identityref | | +--rw peer-list* [peer-ip] | | +--rw peer-ip inet:ip-address | +--rw untagged-interface | | +--rw speed? uint32 | | +--rw mode? neg-mode | | +--rw phy-mtu? uint32 | | +--rw lldp? boolean | | +--rw oam-802.3ah-link {oam-3ah}? | | | +--rw enable? boolean | | +--rw uni-loop-prevention? boolean | +--rw lag-interfaces {lag-interface}? | | +--rw lag-interface* [index] | | +--rw index string | | +--rw lacp {lacp}? | | +--rw enable? boolean | | +--rw mode? neg-mode | | +--rw speed? uint32 | | +--rw mini-link-num? uint32 | | +--rw system-priority? uint16 | | +--rw micro-bfd {micro-bfd}? | | | +--rw enable? enumeration | | | +--rw interval? uint32 | | | +--rw hold-timer? uint32 | | +--rw bfd {bfd}? | | | +--rw enabled? boolean | | | +--rw (holdtime)? | | | +--:(profile) | | | | +--rw profile-name? | | | | -> /l2vpn-svc/ | | | | vpn-profiles/ | | | | valid-provider-identifiers/ | | | | bfd-profile-identifier/id | | | +--:(fixed) | | | +--rw fixed-value? uint32 | | +--rw member-links | | | +--rw member-link* [name] | | | +--rw name string | | | +--rw speed? uint32 | | | +--rw mode? neg-mode | | | +--rw link-mtu? uint32 | | | +--rw oam-802.3ah-link {oam-3ah}? | | | +--rw enable? boolean | | +--rw flow-control? boolean | | +--rw lldp? boolean | +--rw cvlan-id-to-svc-map* [svc-id] | | +--rw svc-id | | | -> /l2vpn-svc/vpn-services/vpn-service/ Wen, et al. Expires August 23, 2018 [Page 17] Internet-Draft L2VPN Service Model February 2018 | | | vpn-id | | +--rw cvlan-id* [vid] | | +--rw vid uint16 | +--rw l2cp-control {l2cp-control}? | | +--rw stp-rstp-mstp? control-mode | | +--rw pause? control-mode | | +--rw lacp-lamp? control-mode | | +--rw link-oam? control-mode | | +--rw esmc? control-mode | | +--rw l2cp-802.1x? control-mode | | +--rw e-lmi? control-mode | | +--rw lldp? boolean | | +--rw ptp-peer-delay? control-mode | | +--rw garp-mrp? control-mode | +--rw oam {oam} | +--rw md-name string | +--rw md-level uint16 | +--rw cfm-802.1-ag* [maid] | | +--rw maid string | | +--rw mep-id? uint32 | | +--rw mep-level? uint32 | | +--rw mep-up-down? enumeration | | +--rw remote-mep-id? uint32 | | +--rw cos-for-cfm-pdus? uint32 | | +--rw ccm-interval? uint32 | | +--rw ccm-holdtime? uint32 | | +--rw alarm-priority-defect? identityref | | +--rw ccm-p-bits-pri? ccm-priority-type | +--rw y-1731* [maid] | +--rw maid string | +--rw mep-id? uint32 | +--rw type? identityref | +--rw remote-mep-id? uint32 | +--rw message-period? uint32 | +--rw measurement-interval? uint32 | +--rw cos? uint32 | +--rw loss-measurement? boolean | +--rw synthethic-loss-measurement? boolean | +--rw delay-measurement | | +--rw enable-dm? boolean | | +--rw two-way? boolean | +--rw frame-size? uint32 | +--rw session-type? enumeration +--rw availability | +--rw access-priority? uint32 | +--rw (redundancy-mode)? | +--:(single-active) | | +--rw single-active? empty Wen, et al. Expires August 23, 2018 [Page 18] Internet-Draft L2VPN Service Model February 2018 | +--:(all-active) | +--rw all-active? empty +--rw vpn-attachment | +--rw (attachment-flavor) | +--:(vpn-id) | | +--rw vpn-id? | | | -> /l2vpn-svc/vpn-services/ | | | vpn-service/vpn-id | | +--rw site-role? identityref | +--:(vpn-policy-id) | +--rw vpn-policy-id? | -> ../../../../vpn-policies/ | vpn-policy/vpn-policy-id +--rw service | +--rw svc-bandwidth {input-bw}? | | +--rw bandwidth* [direction type] | | +--rw direction identityref | | +--rw type identityref | | +--rw cos-id? uint8 | | +--rw vpn-id? svc-id | | +--rw cir uint64 | | +--rw cbs uint64 | | +--rw eir? uint64 | | +--rw ebs? uint64 | | +--rw pir? uint64 | | +--rw pbs? uint64 | +--rw svc-mtu uint16 | +--rw qos {qos}? | | +--rw classification-policy | | | +--rw rule* [id] | | | +--rw id string | | | +--rw (match-type)? | | | | +--:(match-flow) | | | | | +--rw match-flow | | | | | +--rw dscp? inet:dscp | | | | | +--rw dot1q? uint16 | | | | | +--rw pcp? uint8 | | | | | +--rw src-mac? yang:mac-address | | | | | +--rw dst-mac? yang:mac-address | | | | | +--rw color-type? identityref | | | | | +--rw target-sites* | | | | | | svc-id {target-sites}? | | | | | +--rw any? empty | | | | | +--rw vpn-id? svc-id | | | | +--:(match-application) | | | | +--rw match-application? identityref | | | +--rw target-class-id? string | | +--rw qos-profile Wen, et al. Expires August 23, 2018 [Page 19] Internet-Draft L2VPN Service Model February 2018 | | +--rw (qos-profile)? | | +--:(standard) | | | +--rw profile? | | | -> /l2vpn-svc/vpn-profiles/ | | | valid-provider-identifiers/ | | | qos-profile-identifier/id | | +--:(custom) | | +--rw classes {qos-custom}? | | +--rw class* [class-id] | | +--rw class-id string | | +--rw direction? identityref | | +--rw policing? identityref | | +--rw byte-offset? uint16 | | +--rw frame-delay | | | +--rw (flavor)? | | | +--:(lowest) | | | | +--rw use-lowest-latency? | | | | empty | | | +--:(boundary) | | | +--rw delay-bound? uint16 | | +--rw frame-jitter | | | +--rw (flavor)? | | | +--:(lowest) | | | | +--rw use-lowest-jitter? | | | | empty | | | +--:(boundary) | | | +--rw delay-bound? uint32 | | +--rw frame-loss | | | +--rw rate? decimal64 | | +--rw bandwidth | | +--rw guaranteed-bw-percent | | | decimal64 | | +--rw end-to-end? empty | +--rw carrierscarrier {carrierscarrier}? | +--rw signaling-type? identityref +--rw broadcast-unknown-unicast-multicast {bum}? | +--rw multicast-site-type? enumeration | +--rw multicast-gp-address-mapping* [id] | | +--rw id uint16 | | +--rw vlan-id uint16 | | +--rw mac-gp-address yang:mac-address | | +--rw port-lag-number? uint32 | +--rw bum-overall-rate? uint32 | +--rw bum-rate-per-type* [type] | +--rw type identityref | +--rw rate? uint32 +--rw mac-loop-prevention {mac-loop-prevention}? | +--rw protection-type? identityref Wen, et al. Expires August 23, 2018 [Page 20] Internet-Draft L2VPN Service Model February 2018 | +--rw frequency? uint32 | +--rw retry-timer? uint32 +--rw access-control-list | +--rw mac* [mac-address] | +--rw mac-address yang:mac-address +--rw mac-addr-limit +--rw limit-number? uint16 +--rw time-interval? uint32 +--rw action? identityref Figure 4 5.1. Features and Augmentation The model defined in this document implements many features that allow implementations to be modular. As an example, the layer 2 protocols parameters (Section 5.3.2.2) proposed to the customer may also be enabled through features. This model also defines some features for options that are more advanced, such as support for extranet VPNs (Section 5.2.4), site diversity (Section 5.3), and QoS (Section 5.10.2). In addition, as for any YANG model, this service model can be augmented to implement new behaviors or specific features. For example, this model defines VXLAN [RFC7348] for Ethernet packet Encapsulation; if VXLAN Encapsulation does not fulfill all requirements for describing the service, new options can be added through augmentation. 5.2. VPN Service Overview A vpn-service list item contains generic information about the VPN service. The vpn-id of the vpn-service refers to an internal reference for this VPN service. This identifier is purely internal to the organization responsible for the VPN service. A vpn-service is composed of some characteristics: Customer information: Used to identify the customer. VPN Service Type (svc-type): Used to indicate the VPN service Type. The identifier is a string allowing any encoding for the local administration of the VPN service. Cloud Access (cloud-access): All sites in the L2VPN MUST be authorized to access to the cloud. The cloud-access container provides parameters for authorization rules. A cloud identifier Wen, et al. Expires August 23, 2018 [Page 21] Internet-Draft L2VPN Service Model February 2018 is used to reference the target service. This identifier is local to each administration. Service Topology (svc-topo): Used to identify the type of VPN service topology that is required. Frame Delivery Service (frame-delivery): Defines the frame delivery support required for the L2VPN, e.g., multicast delivery, unicast delivery, or broadcast delivery. Extranet VPN (extranet-vpns): Indicates that a particular VPN needs access to resources located in another VPN. 5.2.1. VPN Service Type The "svc-type" defines the service type for provider provisioned L2VPNs. The current version of the model supports six flavors: o Point-to-point Virtual Private Wire Services (VPWS) connecting two customer Sites; o Point-to-point or point-to-multipoint Virtual Private Wire Services (VPWS) connecting a set of customer sites [RFC8214]; o Multipoint Virtual Private LAN services (VPLS) connecting a set of customer sites; o Multipoint Virtual Private LAN services (VPLS) connecting one or more root sites and a set of leave sites, but preventing inter- leaf sites communication. o EVPN Service connecting a set of customer sites. o Ethernet VPN VPWS between two customer sites or a set of customer sites specified in [RFC8214] and [RFC7432]; Other L2VPN Service Types could be included by augmentation. Note that an Ethernet Private Line (EPL) service or an Ethernet Virtual Private Line (EVPL) service is an E-Line service or a point-to-point Ethernet Virtual Circuit (EVC) service, while an Ethernet Private LAN (EP-LAN) service or an Ethernet Virtual Private LAN (EVP-LAN) service is an E-LAN service or a multipoint-to-multipoint EVC service. 5.2.2. VPN Service Topology The type of VPN service topology can be used for configuration if needed. The module currently supports: any-to-any; hub-and-spoke (where hubs can exchange traffic); and hub-and-spoke-disjoint (where Wen, et al. Expires August 23, 2018 [Page 22] Internet-Draft L2VPN Service Model February 2018 hubs cannot exchange traffic). New topologies could be added by augmentation. By default, the any-to-any VPN service topology is used. 5.2.2.1. Route Target Allocation A Layer 2 PE-based VPN (such as a VPLS-based VPN, or an EVPN that uses BGP as its signaling protocol) can be built using route targets (RTs) as described in [RFC4364] an [RFC7432]. The management system is expected to automatically allocate a set of RTs upon receiving a VPN service creation request. How the management system allocates RTs is out of scope for this document, but multiple ways could be envisaged, as described in the Section 6.2.1.1 of [RFC8299]. 5.2.2.2. Any-to-Any +------------------------------------------------------------+ | VPN1_Site1 ------ PE1 PE2 ------ VPN1_Site2 | | | | VPN1_Site3 ------ PE3 PE4 ------ VPN1_Site4 | +------------------------------------------------------------+ Any-to-Any VPN Service Topology In the any-to-any VPN service topology, all VPN sites can communicate with each other without any restrictions. The management system that receives an any-to-any L2VPN service request through this model is expected to assign and then configure the MAC-VRF and RTs on the appropriate PEs. In the any-to-any case, a single RT is generally required, and every MAC-VRF imports and exports this RT. 5.2.2.3. Hub-and-Spoke +-------------------------------------------------------------+ | Hub_Site1 ------ PE1 PE2 ------ Spoke_Site1 | | +----------------------------------+ | | | +----------------------------------+ | Hub_Site2 ------ PE3 PE4 ------ Spoke_Site2 | +-------------------------------------------------------------+ Hub-and-Spoke VPN Service Topology In the Hub-and-Spoke VPN service topology, all Spoke sites can communicate only with Hub sites, but not with each other. And Hubs can also communicate with each other. The management system that receives a Hub-and-Spoke L2VPN service request through this model is expected to assign and then configure the MAC-VRF and RTs on the Wen, et al. Expires August 23, 2018 [Page 23] Internet-Draft L2VPN Service Model February 2018 appropriate PEs. In the Hub-and-Spoke case, two RTs are generally required (one RT for Hub routes, and one RT for Spoke routes). A Hub MAC-VRF that connects Hub sites will export Hub routes with the Hub RT and will import Spoke routes through the Spoke RT. It will also import the Hub RT to allow Hub-to-Hub communication. A Spoke MAC-VRF that connects Spoke sites will export Spoke routes with the Spoke RT and will import Hub routes through the Hub RT. 5.2.2.4. Hub-and-Spoke-Disjoint +-------------------------------------------------------------+ | Hub_Site1 ------ PE1 PE2 ------ Spoke_Site1 | +--------------------------+ +-------------------------------+ | | +--------------------------+ +-------------------------------+ | Hub_Site2 ------ PE3 PE4 ------ Spoke_Site2 | +-------------------------------------------------------------+ Hub-and-Spoke-Disjoint VPN Service Topology In the Hub-and-Spoke-Disjoint VPN service topology, all Spoke sites can communicate only with Hub sites, but not with each other. And Hubs cannot communicate with each other. The management system that receives a Hub-and-Spoke-Disjoint L2VPN service request through this model is expected to assign and then configure the VRF and RTs on the appropriate PEs. In the Hub-and-Spoke-Disjoint case, two RTs arerequired (one RT for Hub routes and one RT for Spoke routes). A Hub VRF that connects Hub sites will export Hub routes with the Hub RT and will import Spoke routes through the Spoke RT. A Spoke VRF that connects Spoke sites will export Spoke routes with the Spoke RT and will import Hub routes through the Hub RT. The management system MUST take into account constraints on Hub-and- Spoke connections, as in the previous case. Hub-and-Spoke-Disjoint can also be seen as multiple Hub-and-Spoke VPNs (one per Hub) that share a common set of Spoke sites. 5.2.3. Cloud Access This model provides cloud access configuration through the cloud- access container. The usage of cloud-access is targeted for public cloud and for Internet access. The cloud-access container provides parameters for authorization rules. Private cloud access may be addressed through the site container as described in Section 5.3 with use consistent with sites of type NNI. Wen, et al. Expires August 23, 2018 [Page 24] Internet-Draft L2VPN Service Model February 2018 A cloud identifier is used to reference the target service. This identifier is local to each administration. By default, all sites in the L2VPN MUST be authorized to access the cloud. If restrictions are required, a user MAY configure the "permit-site" or "deny-site" leaf-list. The permit-site leaf-list defines the list of sites authorized for cloud access. The deny-site leaf-list defines the list of sites denied for cloud access. The model supports both "deny-any-except" and "permit-any-except" authorization. How the restrictions will be configured on network elements is out of scope for this document. L2VPN ++++++++++++++++++++++++++++++++ ++++++++++++ + Site 3 + --- + Cloud 1 + + Site 1 + ++++++++++++ + + + Site 2 + --- ++++++++++++ + + + Internet + + Site 4 + ++++++++++++ ++++++++++++++++++++++++++++++++ | +++++++++++ + Cloud 2 + +++++++++++ In the example above, we configure the global VPN to access the Internet by creating a cloud-access container pointing to the cloud identifier for the Internet service. No authorized sites will be configured, as all sites are required to be able to access the Internet. Wen, et al. Expires August 23, 2018 [Page 25] Internet-Draft L2VPN Service Model February 2018 123456487 INTERNET true true If Site 1 and Site 2 require access to Cloud 1, a new cloud-access container pointing to the cloud identifier of Cloud 1 will be created. The permit-site leaf-list will be filled with a reference to Site 1 and Site 2. 123456487 Cloud1 site1 site2 true true If all sites except Site 1 require access to Cloud 2, a new cloud- access container pointing to the cloud identifier of Cloud 2 will be created. The deny-site leaf-list will be filled with a reference to Site 1. Wen, et al. Expires August 23, 2018 [Page 26] Internet-Draft L2VPN Service Model February 2018 123456487 Cloud2 site1 true true 5.2.4. Extranet VPNs There are some cases where a particular VPN needs access to resources (servers, hosts, etc.) that are external. Those resources may be located in another VPN. +-----------+ +-----------+ / \ / \ Site A -- | VPN A | --- | VPN B | --- Site B \ / \ / (Shared +-----------+ +-----------+ resources) In the figure above, VPN B has some resources on Site B that need to be made available to some customers/partners. Specifically, VPN A must be able to access those VPN B resources. Such a VPN connection scenario can be achieved via a VPN policy as defined in Section 5.5.2.2. But there are some simple cases where a particular VPN (VPN A) needs access to all resources in another VPN (VPN B). The model provides an easy way to set up this connection using the "extranet-vpns" container. The extranet-vpns container defines a list of VPNs a particular VPN wants to access. The extranet-vpns container is used on customer VPNs accessing extranet resources in another VPN. In the figure above, in order to provide VPN A with access to VPN B, the extranet- vpns container needs to be configured under VPN A with an entry corresponding to VPN B. There is no service configuration requirement on VPN B. Wen, et al. Expires August 23, 2018 [Page 27] Internet-Draft L2VPN Service Model February 2018 Readers should note that even if there is no configuration requirement on VPN B, if VPN A lists VPN B as an extranet, all sites in VPN B will gain access to all sites in VPN A. The "site-role" leaf defines the role of the local VPN sites in the target extranet VPN service topology. Site roles are defined in Section 5.4. In the example below, VPN A accesses VPN B resources through an extranet connection. A Spoke role is required for VPN A sites, as sites from VPN A must not be able to communicate with each other through the extranet VPN connection. VPNB hub-spoke VPNA any-to-any VPNB spoke-role true true This model does not define how the extranet configuration will be achieved within the network. Any VPN interconnection scenario that is more complex (e.g., only certain parts of sites on VPN A accessing only certain parts of sites on VPN B) needs to be achieved using a VPN attachment as defined in Section 5.5.2, and especially a VPN policy as defined in Section 5.5.2.2. Wen, et al. Expires August 23, 2018 [Page 28] Internet-Draft L2VPN Service Model February 2018 5.2.5. Frame Delivery Service If Frame Delivery Service support is required for an L2VPN, some global frame delivery parameters are required as input for the service request. When a CE sends packets that are Broadcast, Multicast, or Unknown-destination-unicast, replication occurs at the ingress PE, therefore three frame types are supported. Users of this model will need to provide the flavors of trees that will be used by customers within the L2VPN (customer-tree-flavors). The model defined in this document supports bidirectional, shared, and source-based trees (and can be augmented to contain other tree types). Multiple flavors of trees can be supported simultaneously. Operator network ______________ / \ | | | | Recv -- Site2 ------- PE2 | | PE1 --- Site1 --- Source1 | | \ | | -- Source2 | | | | Recv -- Site3 ------- PE3 | | | | | Recv -- Site4 ------- PE4 | / | | Recv -- Site5 ------- | | | | | | \_______________/ Multicast Group to port mappings can be created using the "rp-group- mappings" leaf. Two group to port mapping methods are supported: o Static configuration of multicast Ethernet addresses and ports/ interfaces. o Multicast control protocol based on Layer-2 technology that signals mappings of multicast addresses to ports/interfaces, such as Generic Attribute Registration Protocol / GARP Multicast Registration Protocol (GARP/GMRP) [IEEE-802-1D]. Wen, et al. Expires August 23, 2018 [Page 29] Internet-Draft L2VPN Service Model February 2018 5.3. Site Overview A site represents a connection of a customer office to one or more VPN services. Each site is associated with one or more location. +-------------+ / \ +-----| VPN1 | +------------------+ | \ / | | | +-------------+ | New York Office |------ (site) -----+ | | | +-------------+ +------------------+ | / \ +-----| VPN2 | \ / +-------------+ The "site" container is used for the provider to store information of detailed implementation arrangements made with either the customer or with peer operators at each inter-connect location. We restrict the L2SM to exterior interfaces only, so all internal interfaces and the underlying topology are outside the scope of L2SM. Typically, the following characteristics of a site interface handoff need to be documented as part of the service design: Unique identifier (site-id): An arbitrary string to uniquely identify the site within the overall network infrastructure. The format of site-id is determined by the local administration of the VPN service. Device (device): The customer can request one or more customer premise equipments from the service provider for a particular site. Management (management): Defines the model of management for the site, for example: type, management-transport, address. Location (location): The site location information to allow easy retrieval of data about which are the nearest available resources. Site diversity (site-diversity): Presents some parameters to support site diversity. Site Network Accesses (site-network-accesses): Defines the list of ports to the site and their properties: especially bearer, connection, and service parameters. Wen, et al. Expires August 23, 2018 [Page 30] Internet-Draft L2VPN Service Model February 2018 A site-network-access represents an Ethernet logical connection to a site. A site may have multiple site-network-accesses. +------------------+ Site | |----------------------------------- | |****** (site-network-access#1) ****** | New York Office | | |****** (site-network-access#2) ****** | |----------------------------------- +------------------+ Multiple site-network-accesses are used, for instance, in the case of multihoming. Some other meshing cases may also include multiple site-network-accesses. The site configuration is viewed as a global entity; we assume that it is mostly the management system's role to split the parameters between the different elements within the network. For example, in the case of the site-network-access configuration, the management system needs to split the parameters between the PE configuration and the CE configuration. 5.3.1. Devices and Locations The information in the "location" sub-container under a "site" and in the "device" container allows easy retrieval of data about which are the nearest available facilities and can be used for access topology planning. It may also be used by other network orchestration components to choose the targeted upstream PE and downstream CE. Location is expressed in terms of postal information. A site may be composed of multiple locations. All the locations will need to be configured as part of the "locations" container and list. A typical example of a multi-location site is a headquarters office in a city composed of multiple buildings. Those buildings may be located in different parts of the city and may be linked by intra- city fibers (a customer metropolitan area network). In such a case, when connecting to a VPN service, the customer may ask for multihoming based on its distributed locations. Wen, et al. Expires August 23, 2018 [Page 31] Internet-Draft L2VPN Service Model February 2018 New York Site +------------------+ Site | +--------------+ |----------------------------------- | | Manhattan | |****** (site-network-access#1) ****** | +--------------+ | | +--------------+ | | | Brooklyn | |****** (site-network-access#2) ****** | +--------------+ |----------------------------------- +------------------+ A customer may also request the use of some premises equipment entities (CEs) from the SP via the "devices" container. Requesting a CE implies a provider-managed or co-managed model. A particular device must be ordered to a particular already-configured location. This would help the SP send the device to the appropriate postal address. In a multi-location site, a customer may, for example, request a CE for each location on the site where multihoming must be implemented. In the figure above, one device may be requested for the Manhattan location and one other for the Brooklyn location. By using devices and locations, the user can influence the multihoming scenario he wants to implement: single CE, dual CE, etc. 5.3.2. Site Network Accesses The L2SM includes a set of essential physical interface properties and Ethernet layer characteristics in the "site-network-accesses" container. Some of these are critical implementation arrangements that require consent from both customer and provider. As mentioned earlier, a site may be multihomed. Each logical network access for a site is defined in the "site-network-accesses" container. The site-network-access parameter defines how the site is connected on the network and is split into three main classes of parameters: o bearer: defines requirements of the attachment (below Layer 2). o connection: defines Layer 2 protocol parameters of the attachment. o availability: defines the site's availability policy. The availability parameters are defined in Section 5.8. The site-network-access has a specific type (site-network-access- type). This document defines two types: o point-to-point: describes a point-to-point connection between the SP and the customer. Wen, et al. Expires August 23, 2018 [Page 32] Internet-Draft L2VPN Service Model February 2018 o multipoint: describes a multipoint connection between the SP and the customer. This site-network-access type may have an impact on the parameters offered to the customer, e.g., an SP might not offer encryption for multipoint accesses. It is up to the provider to decide what parameters are supported for point-to-point and/or multipoint accesses. Multipoint accesses are out of scope for this document and some containers defined in the model may require extensions in order to work properly for multipoint accesses. 5.3.2.1. Bearer The "bearer" container defines the requirements for the site attachment to the provider network that are below Layer 3. The bearer parameters will help to determine the access media to be used. 5.3.2.2. Connection The "connection" container defines the layer 2 protocol parameters of the attachment (e.g.,vlan-id or circuit-id) and provides connectivity between customer Ethernet switches. Depending on the management mode, it refers to PE-CE-LAN segment addressing or to CE-to-customer- LAN segment addressing. In any case, it describes the responsibility boundary between the provider and the customer. For a customer- managed site, it refers to the PE-CE-LAN Segment connection. For a provider-managed site, it refers to the CE-to-LAN Segment connection. "encapsulation-type" allows the user to select between Ethernet encapsulation (port-based) or Ethernet VLAN encapsulation (VLAN- based). All of the allowed Ethernet interface types of service frame can be listed under "ether-inf-type", e.g., untagged interface, tagged interface, LAG interface. Corresponding to "ether-inf-type", the connection container also presents three sets of link attributes: untagged interface, tagged interface, or optional LAG interface attributes. These parameters are essential for the connection to establish properly between the customer and provider edge devices. The connection container also defines an L2CP attribute to allow control plane protocol interaction between the CE devices and PE device. Wen, et al. Expires August 23, 2018 [Page 33] Internet-Draft L2VPN Service Model February 2018 5.3.2.2.1. Untagged Interface For each untagged interface (untagged-interface), there are basic configuration parameters like interface index and speed, interface MTU, auto-negotiation and flow-control settings, etc. In addition and based on mutual agreement, the customer and provider may decide to enable advanced features, such as LLDP, 802.3AH link OAM, MAC loop detection/prevention at a UNI. If Loop avoidance is required, the attribute "uni-loop-prevention" must be set to TRUE. 5.3.2.2.2. Tagged Interface If the tagged service is enabled on a logical unit on the connection at the interface, "encapsulation-type" should be specified as the Ethernet VLAN ecapsulation (if VLAN-based) or VXLAN encapsulation, and "eth-inf-type" should be set to indicate a tagged interface. In addition, "tagged-interface-type" should be specified under "tagged-interface" container to determines how tagging needs to be done. The current model defines five ways to perform VLAN tagging: o priority-tagged: Service providers encapsulate and tag packets between CE and PE with the frame priority level. o dot1q-vlan-tagged: Service providers encapsulate packets between CE and PE with one or a set of customer VLAN IDs (C-VLANs) o qinq: service providers encapsulate packets that enter the service-provider network with multiple customer VLAN IDs (C-VLANs) and a single VLAN tag with a single service provider VLAN (S-VLAN). o qinany: service providers encapsulate packets that enter the service-provider network with unknown C-VLAN and a single VLAN tag with a single service provider VLAN (S-VLAN). o vxlan: service providers encapsulate packets that enter the service-provider network with VNI and peer list. The overall S-tag for the Ethernet circuit and C-tag-to-SVC mapping, if applicable, has been placed in the service container. For the qinq an qinany options, the S-tag under "qinq" and "qinany" should match the S-tag in the service container in most cases, however, vlan translation is required for the S-tag in certain deployment at the external facing interface or upstream PEs to "normalize" the outer VLAN tag to the service S-tag into the network and translate back to the site's S-tag in the opposite direction. One example of this is with a Layer 2 aggregation switch along the path: the S-tag for the Wen, et al. Expires August 23, 2018 [Page 34] Internet-Draft L2VPN Service Model February 2018 SVC has been previously assigned to another service thus can not be used by this attachment circuit. 5.3.2.2.3. LAG Interface Sometimes, the customer may require multiple physical links bundled together to form a single, logical, point-to-point LAG connection to the service provider. Typically, LACP (Link Aggregation Control Protocol) is used to dynamically manage adding or deleting member links of the aggregate group. In general, a LAG allows for increased service bandwidth beyond the speed of a single physical link while providing graceful degradation as failure occurs, thus increased availability. In the L2SM, there is a set of attributes under "LAG-interface" related to link aggregation functionality. The customer and provider first need to decide on whether LACP PDUs will be exchanged between the edge devices by specifying the "LACP-state" to "On" or "Off". If LACP is to be enabled, then both parties need to further specify whether it will be running in active or passive mode, plus the time interval and priority level of the LACP PDU. The customer and provider can also determine the minimum aggregate bandwidth for a LAG to be considered as a valid path by specifying the optional "mini- link" attribute. To enable fast detection of faulty links, micro-bfd runs independent UDP sessions to monitor the status of each member link. Customer and provider should agree the BFD hello interval and hold time. Each member link will be listed under the LAG interface with basic physical link properties. Certain attributes like flow-control, encapsulation type, allowed ingress Ethertype and LLDP settings are at the LAG level. 5.3.2.2.4. CVLAN ID To SVC MAP When more than one service is multiplexed onto the same interface, ingress service frames are conditionally transmitted through one of the L2VPN services based upon pre-arranged customer VLAN-to-SVC mapping. Multiple customer VLANs can be bundled across the same SVC. The bundling type will determine how a group of CVLANs is bundled into one VPN service (i.e., VLAN-Bundling). "cvlan-id-to-svc-map", when applicable, contains the list of customer VLANs that are mapped to the same service. In most cases, this will be the VLAN access-list for the inner 802.1q tag (the C-tag). A VPN Service can be set to preserve the CE-VLAN ID and CE-VLAN CoS from source site to destination site. This is required when the Wen, et al. Expires August 23, 2018 [Page 35] Internet-Draft L2VPN Service Model February 2018 customer wants to use the VLAN header information between its two sites. CE-VLAN ID Preservation and CE-VLAN CoS Preservation are applied on each site-network-access within sites. Preservation means that the value of CE-VLAN ID and/or CE-VLAN CoS at source site must be equal to the value at a destination site belonging to the same L2VPN Service. If All-to-One bundling is Enabled (i.e., bundling type is set to all- to-one bundling), then preservation applies to all Ingress service frames. If All-to-One bundling is Disabled, then preservation applies to tagged Ingress service frames having the CE-VLAN ID. 5.3.2.2.5. L2CP Control Support Customer and Service provider should pre-arrange whether to allow control plane protocol interaction between the CE devices and PE device. To provide seamless operation with multicast data transport, the transparent operation of Ethernet control protocols (e.g., Spanning Tree Protocol [IEEE-802-1D]) can be employed by customers. To support efficient dynamic transport, Ethernet multicast control frames (e.g., GARP/GMRP [IEEE-802-1D]) can be used between CE and PE. However, solutions MUST NOT assume all CEs are always running such protocols (typically in the case where a CE is a router and is not aware of Layer-2 details). The destination MAC addresses of these L2CP PDUs fall within two reserved blocks specified by the IEEE 802.1 Working Group. Packet with destination MAC in these multicast ranges have special forwarding rules. o Bridge Block of Protocols: 01-80-C2-00-00-00 through 01-80-C2-00-00-0F o MRP Block of Protocols: 01-80-C2-00-00-20 through 01-80-C2-00-00-2F Layer 2 protocol tunneling allows service providers to pass subscriber Layer 2 control PDUs across the network without being interpreted and processed by intermediate network devices. These L2CP PDUs are transparently encapsulated across the MPLS-enabled core network in Q-in-Q fashion. The "L2CP-control" container contains the list of commonly used L2CP protocols and parameters. The service provider can specify DISCARD, PEER, or TUNNEL mode actions for each individual protocol. Wen, et al. Expires August 23, 2018 [Page 36] Internet-Draft L2VPN Service Model February 2018 5.3.2.2.6. Ethernet Service OAM The advent of Ethernet as a wide-area network technology brings additional requirements of end-to-end service monitoring and fault management in the SP network, particularly in the area of service availability and Mean Time To Repair (MTTR). Ethernet Service OAM in the L2SM model refers to the combined protocol suites of IEEE 802.1ag ([IEEE-802-1ag]) and ITU-T Y.1731 ([ITU-T-Y-1731]). Generally speaking, Ethernet Service OAM enables service providers to perform service continuity check, fault-isolation, and packet delay/ jitter measurement at per-customer and per-site network access granularity. The information collected from Ethernet Service OAM data sets is complementary to other higher layer IP/MPLS OSS tools to ensure the required service level agreements (SLAs) can be meet. The 802.1ag Connectivity Fault Management (CFM) functional model is structured with hierarchical maintenance domains (MDs), each assigned with a unique maintenance level. Higher level MDs can be nested over lower level MDs. However, the MDs cannot intersect. The scope of each MD can be solely within a customer network, solely within the SP network, interact between the customer-to-provider or provider-to- provider edge equipment, or tunnel over another SP network. Depending on the use case scenario, one or more maintenance end points (MEPs) can be placed on the external facing interface, sending CFM PDUs towards the core network (Up MEP) or downstream link (Down MEP). The "cfm-802.1-ag" sub-container under "site-network-access" presents the CFM maintenance association (MA): i.e., Down MEP for the UNI MA. For each MA, the user can define the maintenance domain ID (MAID), MEP level, MEP direction, remote MEP ID, CoS level of the CFM PDUs, Continuity Check Message (CCM) interval and hold time, alarm priority defect, CCM priority-type, etc. ITU-T Y.1731 Performance Monitoring (PM) provides essential network telemetry information that includes the measurement of Ethernet service frame delay, frame delay variation, frame loss, and frame throughput. The delay/jitter measurement can be either one-way or two-way. Typically, a Y.1731 PM probe sends a small amount of synthetic frames along with service frames to measure the SLA parameters. The "y-1731" sub-container under "site-network-access" contains a set of parameters to define the PM probe information, including MAID, local and remote MEP-ID, PM PDU type, message period and measurement interval, CoS level of the PM PDUs, loss measurement by synthetic or Wen, et al. Expires August 23, 2018 [Page 37] Internet-Draft L2VPN Service Model February 2018 service frame options, one-way or two-way delay measurement, PM frame size, and session type. 5.4. Site Role A VPN has a particular service topology, as described in Section 5.2.2. As a consequence, each site belonging to a VPN is assigned a particular role in this topology. The site-role leaf defines the role of the site in a particular VPN topology. In the any-to-any VPN service topology, all sites MUST have the same role, which will be "any-to-any-role". In the Hub-and-Spoke VPN service topology or the Hub-and-Spoke- Disjoint VPN service topology, sites MUST have a Hub role or a Spoke role. 5.5. Site Belonging to Multiple VPNs 5.5.1. Site VPN Flavor A site may be part of one or more VPNs. The "site-vpn-flavor" defines the way the VPN multiplexing is done. There are three possible types of external facing connections associated with an Ethernet VPN service and a site. Therefore the model supports three flavors: o site-vpn-flavor-single: The site belongs to only one VPN. o site-vpn-flavor-multi: The site belongs to multiple VPNs, and all the logical accesses of the sites belong to the same set of VPNs. o site-vpn-flavor-nni: The site represents an NNI where two administrative domains belonging to the same or different providers inter-connect. o site-vpn-flavor-e2e: The site represents an end-to-end multi- segment connection. 5.5.1.1. Single VPN Attachment: site-vpn-flavor-single The figure below describes a single VPN attachment. The site connects to only one VPN. Wen, et al. Expires August 23, 2018 [Page 38] Internet-Draft L2VPN Service Model February 2018 +--------+ +------------------+ Site / \ | |-----------------------------| | | |***(site-network-access#1)***| VPN1 | | New York Office | | | | |***(site-network-access#2)***| | | |-----------------------------| | +------------------+ \ / +--------+ 5.5.1.2. MultiVPN Attachment: site-vpn-flavor-multi The figure below describes a site connected to multiple VPNs. +---------+ +---/----+ \ +------------------+ Site / | \ | | |--------------------------------- | |VPN B| | |***(site-network-access#1)******* | | | | New York Office | | | | | | |***(site-network-access#2)******* \ | / | |-----------------------------| VPN A+-----|---+ +------------------+ \ / +--------+ In the example above, the New York office is multihomed. Both logical accesses are using the same VPN attachment rules, and both are connected to VPN A and to VPN B. Reaching VPN A or VPN B from the New York office will be done via destination-based routing. Having the same destination reachable from the two VPNs may cause routing problems. The customer administration's role in this case would be to ensure the appropriate mapping of its prefixes in each VPN. 5.5.1.3. NNI: site-vpn-flavor-nni A Network-to-Network Interface (NNI) scenario may be modeled using the sites container. It is helpful for the SP to indicate that the requested VPN connection is not a regular site but rather is an NNI, as specific default device configuration parameters may be applied in the case of NNIs (e.g., ACLs, routing policies). Wen, et al. Expires August 23, 2018 [Page 39] Internet-Draft L2VPN Service Model February 2018 SP A SP B ------------------- ------------------- / \ / \ | | | | | ++++++++ Inter-AS link ++++++++ | | + +_______________+ + | | + (MAC-VRF1)-(VPN1)-(MAC-VRF1)+ | | + + + + | | + ASBR + + ASBR + | | + + + + | | + (MAC-VRF2)-(VPN2)-(MAC-VRF2)+ | | + +_______________+ + | | ++++++++ ++++++++ | | | | | | | | | | | | | | ++++++++ Inter-AS link ++++++++ | | + +_______________+ + | | + (MAC-VRF1)-(VPN1)-(MAC-VRF1)+ | | + + + + | | + ASBR + + ASBR + | | + + + + | | + (MAC-VRF2)-(VPN2)-(MAC-VRF2)+ | | + +_______________+ + | | ++++++++ ++++++++ | | | | | | | | | \ / \ / ------------------- ------------------- The figure above describes an option A NNI scenario that can be modeled using the sites container. In order to connect its customer VPNs (VPN1 and VPN2) in SP B, SP A may request the creation of some site-network-accesses to SP B. The site-vpn-flavor-nni will be used to inform SP B that this is an NNI and not a regular customer site. 5.5.1.4. E2E: site-vpn-flavor-e2e A end to end multi-segment VPN connection to be constructed out of several connectivity segments may be modeled. It is helpful for the SP to indicate the requested VPN connection is not a regular site but rather is an end-to-end VPN connection, as specific default device configuration parameters may be applied in case of site-vpn-flavor- e2e (e.g., QoS configuration). In order to establish a connection between Site 1 in SP A and Site 2 in SP B spanning across multiple domains, SP A may request the creation of end-to-end connectivity to SP B. The site-vpn-flavor-e2e will be used to indicate that this is an end-to-end connectivity setup and not a regular customer site. Wen, et al. Expires August 23, 2018 [Page 40] Internet-Draft L2VPN Service Model February 2018 5.5.2. Attaching a Site to a VPN Due to the multiple site-vpn flavors, the attachment of a site to an L2VPN is done at the site-network-access (logical access) level through the "vpn-attachment" container. The vpn-attachment container is mandatory. The model provides two ways to attach a site to a VPN: o By referencing the target VPN directly. o By referencing a VPN policy for attachments that are more complex. A choice is implemented to allow the user to choose the flavor that provides the best fit. 5.5.2.1. Referencing a VPN Referencing a vpn-id provides an easy way to attach a particular logical access to a VPN. This is the best way in the case of a single VPN attachment. When referencing a vpn-id, the site-role setting must be added to express the role of the site in the target VPN service topology. VPNA true true VPNB true true SITE1 L1 customer-managed Wen, et al. Expires August 23, 2018 [Page 41] Internet-Draft L2VPN Service Model February 2018 < network-access-id>LA1 input-bw bw-per-cos 450000000 20000000 1000000000 200000000 bgp 1514 VPNA spoke-role < network-access-id>LA2 input-bw bw-per-cos 450000000 20000000 1000000000 200000000 bgp 1514 VPNB spoke-role Wen, et al. Expires August 23, 2018 [Page 42] Internet-Draft L2VPN Service Model February 2018 The example above describes a multi-VPN case where a site (SITE1) has two logical accesses (LA1 and LA2), attached to both VPNA and VPNB. 5.5.2.2. VPN Policy The "vpn-policy" list helps express a multi-VPN scenario where a logical access belongs to multiple VPNs. As a site can belong to multiple VPNs, the vpn-policy list may be composed of multiple entries. A filter can be applied to specify that only some LANs at the site should be part of a particular VPN. Each time a site (or LAN) is attached to a VPN, the user must precisely describe its role (site-role) within the target VPN service topology. +--------------------------------------------------------------+ | Site1 ------ PE7 | +-------------------------+ [VPN2] | | | +-------------------------+ | | Site2 ------ PE3 PE4 ------ Site3 | +----------------------------------+ | | | +------------------------------------------------------------+ | | Site4 ------ PE5 | PE6 ------ Site5 | | | | | | [VPN3] | | +------------------------------------------------------------+ | | | +---------------------------+ In the example above, Site5 is part of two VPNs: VPN3 and VPN2. It will play a Hub role in VPN2 and an any-to-any role in VPN3. We can express such a multi-VPN scenario as follows: VPN2 true true VPN3 Wen, et al. Expires August 23, 2018 [Page 43] Internet-Draft L2VPN Service Model February 2018 true true L1 customer-managed Site5 POLICY1 ENTRY1 VPN2 hub-role ENTRY2 VPN3 any-to-any-role < network-access-id>LA1 SITE1 L1 customer-managed Wen, et al. Expires August 23, 2018 [Page 44] Internet-Draft L2VPN Service Model February 2018 < network-access-id>LA1 input-bw bw-per-cos 450000000 20000000 1000000000 200000000 bgp 1514 VPNA spoke-role < network-access-id>LA2 input-bw bw-per-cos 450000000 20000000 1000000000 200000000 bgp 1514 VPNB spoke-role Wen, et al. Expires August 23, 2018 [Page 45] Internet-Draft L2VPN Service Model February 2018 POLICY1 Now, if a more-granular VPN attachment is necessary, filtering can be used. For example, if LAN1 from Site5 must be attached to VPN2 as a Hub and LAN2 must be attached to VPN3, the following configuration can be used: VPN2 true true VPN3 true true L1 customer-managed Site5 POLICY1 ENTRY1 lan LAN1 Wen, et al. Expires August 23, 2018 [Page 46] Internet-Draft L2VPN Service Model February 2018 VPN2 hub-role ENTRY2 lan LAN2 VPN3 any-to-any-role < network-access-id>LA1 input-bw bw-per-cos 450000000 20000000 1000000000 200000000 bgp 1514 POLICY1 Wen, et al. Expires August 23, 2018 [Page 47] Internet-Draft L2VPN Service Model February 2018 5.6. Deciding Where to Connect the Site The management system will have to determine where to connect each site-network-access of a particular site to the provider network (e.g., PE or aggregation switch). This model defines parameters and constraints that can influence the meshing of the site-network-access. The management system MUST honor all customer constraints, or if a constraint is too strict and cannot be fulfilled, the management system MUST NOT provision the site and MUST provide information to the user about which constraints that could not be fulfilled. How the information is provided is out of scope for this document. Whether or not to relax the constraint would then be left up to the user. Parameters such as site location (see Section 5.6.2) and access type are just hints (see Section 5.6.3) for the management system for service placement. In addition to parameters and constraints, the management system's decision MAY be based on any other internal constraints that are left up to the SP, such as least load, distance, etc. 5.6.1. Constraint: Device In the case of provider management or co-management, one or more devices have been ordered by the customer to a particular location that has already been configured. The customer may force a particular site- network-access to be connected on a particular device that he ordered. New York Site +------------------+ Site | +--------------+ |----------------------------------- | | Manhattan | | | | CE1********* (site-network-access#1) ****** | +--------------+ | | +--------------+ | | | Brooklyn | | | | CE2********* (site-network-access#2) ****** | +--------------+ | | |----------------------------------- +------------------+ Wen, et al. Expires August 23, 2018 [Page 48] Internet-Draft L2VPN Service Model February 2018 In the figure above, site-network-access#1 is associated with CE1 in the service request. The SP must ensure the provisioning of this connection. 5.6.2. Constraint/Parameter: Site Location The location information provided in this model MAY be used by a management system to determine the target PE to mesh the site (SP side). A particular location must be associated with each site network access when configuring it. The SP MUST honor the termination of the access on the location associated with the site network access (customer side). The "country-code" in the site location should be expressed as an ISO ALPHA-2 code. The site-network-access location is determined by the "location- flavor". In the case of a provider-managed or co-managed site, the user is expected to configure a "device-reference" (device case) that will bind the site-network-access to a particular device that the customer ordered. As each device is already associated with a particular location, in such a case the location information is retrieved from the device location. In the case of a customer- managed site, the user is expected to configure a "location- reference" (location case); this provides a reference to an existing configured location and will help with placement. POP#1 (New York) +---------+ | PE1 | Site #1 ---... | PE2 | (Atlantic City) | PE3 | +---------+ POP#2 (Washington) +---------+ | PE4 | | PE5 | | PE6 | +---------+ POP#3 (Philadelphia) +---------+ | PE7 | Site #2 CE#1---... | PE8 | (Reston) | PE9 | +---------+ In the example above, Site #1 is a customer-managed site with a location L1, while Site #2 is a provider-managed site for which a CE Wen, et al. Expires August 23, 2018 [Page 49] Internet-Draft L2VPN Service Model February 2018 (CE#1) was ordered. Site #2 is configured with L2 as its location. When configuring a site-network-access for Site #1, the user will need to reference location L1 so that the management system will know that the access will need to terminate on this location. Then, for distance reasons, this management system may mesh Site #1 on a PE in the Philadelphia POP. It may also take into account resources available on PEs to determine the exact target PE (e.g., least loaded). For Site #2, the user is expected to configure the site- network-access with a device-reference to CE#1 so that the management system will know that the access must terminate on the location of CE#1 and must be connected to CE#1. For placement of the SP side of the access connection, in the case of the nearest PE used, it may mesh Site #2 on the Washington POP. 5.6.3. Constraint/Parameter: Access Type The management system needs to elect the access media to connect the site to the customer (for example, xDSL, leased line, Ethernet backhaul). The customer may provide some parameters/constraints that will provide hints to the management system. The bearer container information SHOULD be the first piece of information considered when making this decision: o The "requested-type" parameter provides information about the media type that the customer would like to use. If the "strict" leaf is equal to "true", this MUST be considered a strict constraint so that the management system cannot connect the site with another media type. If the "strict" leaf is equal to "false" (default) and if the requested media type cannot be fulfilled, the management system can select another media type. The supported media types SHOULD be communicated by the SP to the customer via a mechanism that is out of scope for this document. o The "always-on" leaf defines a strict constraint: if set to true, the management system MUST elect a media type that is "always-on" (e.g., this means no dial access type). o The "bearer-reference" parameter is used in cases where the customer has already ordered a network connection to the SP apart from the L2VPN site and wants to reuse this connection. The string used is an internal reference from the SP and describes the already-available connection. This is also a strict requirement that cannot be relaxed. How the reference is given to the customer is out of scope for this document, but as an example, when the customer ordered the bearer (through a process that is out of scope for this model), the SP may have provided the bearer reference that can be used for provisioning services on top. Wen, et al. Expires August 23, 2018 [Page 50] Internet-Draft L2VPN Service Model February 2018 Any other internal parameters from the SP can also be used. The management system MAY use other parameters, such as the requested "svc-input-bandwidth" and "svc-output-bandwidth", to help decide which access type to use. 5.6.4. Constraint: Access Diversity Each site-network-access may have one or more constraints that would drive the placement of the access. By default, the model assumes that there are no constraints, but allocation of a unique bearer per site-network-access is expected. In order to help with the different placement scenarios, a site- network-access may be tagged using one or multiple group identifiers. The group identifier is a string, so it can accommodate both explicit naming of a group of sites (e.g., "multihomed-set1") and the use of a numbered identifier (e.g., 12345678). The meaning of each group-id is local to each customer administrator, and the management system MUST ensure that different customers can use the same group-ids. One or more group-ids can also be defined at the site level; as a consequence, all site-network-accesses under the site MUST inherit the group-ids of the site they belong to. When, in addition to the site group-ids some group-ids are defined at the site-network-access level, the management system MUST consider the union of all groups (site level and site network access level) for this particular site- network-access. For an already-configured site-network-access, each constraint MUST be expressed against a targeted set of site-network-accesses. This site-network-access MUST never be taken into account in the targeted set -- for example, "My site-network-access S must not be connected on the same POP as the site-network-accesses that are part of Group 10." The set of site-network-accesses against which the constraint is evaluated can be expressed as a list of groups, "all-other- accesses", or "all-other-groups". The all-other-accesses option means that the current site-network-access constraint MUST be evaluated against all the other site-network-accesses belonging to the current site. The all-other-groups option means that the constraint MUST be evaluated against all groups that the current site-network-access does not belong to. The current model defines multiple constraint-types: o pe-diverse: The current site-network-access MUST NOT be connected to the same PE as the targeted site-network-accesses. o pop-diverse: The current site-network-access MUST NOT be connected to the same POP as the targeted site-network-accesses. Wen, et al. Expires August 23, 2018 [Page 51] Internet-Draft L2VPN Service Model February 2018 o linecard-diverse: The current site-network-access MUST NOT be connected to the same linecard as the targeted site-network- accesses. o bearer-diverse: The current site-network-access MUST NOT use common bearer components compared to bearers used by the targeted site-network-accesses. "bearer-diverse" provides some level of diversity at the access level. As an example, two bearer-diverse site-network-accesses must not use the same DSLAM, BAS, or Layer 2 switch. o same-pe: The current site-network-access MUST be connected to the same PE as the targeted site-network-accesses. o same-bearer: The current site-network-access MUST be connected using the same bearer as the targeted site-network-accesses. These constraint-types can be extended through augmentation. Each constraint is expressed as "The site-network-access S must be (e.g., pe-diverse, pop-diverse) from these site-network-accesses." The group-id used to target some site-network-accesses may be the same as the one used by the current site-network-access. This eases the configuration of scenarios where a group of site-network-access points has a constraint between the access points in the group. 5.7. Route Distinguisher and Network Instance Allocation The route distinguisher (RD) is a critical parameter of BGP-based L2VPNs as described in [RFC4364] that provides the ability to distinguish common addressing plans in different VPNs. As for route targets (RTs), a management system is expected to allocate a MAC-VRF on the target PE and an RD for this MAC-VRF. This RD MUST be unique across all MAC-VRFs on the target PE. If a MAC-VRF already exists on the target PE and the MAC-VRF fulfills the connectivity constraints for the site, there is no need to recreate another MAC-VRF, and the site MAY be meshed within this existing MAC-VRF. How the management system checks that an existing MAC-VRF fulfills the connectivity constraints for a site is out of scope for this document. If no such MAC-VRF exists on the target PE, the management system has to initiate the creation of a new MAC-VRF on the target PE and has to allocate a new RD for this new MAC-VRF. Wen, et al. Expires August 23, 2018 [Page 52] Internet-Draft L2VPN Service Model February 2018 The management system MAY apply a per-VPN or per-MAC-VRF allocation policy for the RD, depending on the SP's policy. In a per-VPN allocation policy, all MAC-VRFs (dispatched on multiple PEs) within a VPN will share the same RD value. In a per-MAC-VRF model, all MAC- VRF should always have a unique RD value. Some other allocation policies are also possible, and this document does not restrict the allocation policies to be used. The allocation of RDs MAY be done in the same way as RTs. The examples provided in Section 5.2.2.1 could be reused in this scenario. Note that an SP MAY configure a target PE for an automated allocation of RDs. In this case, there will be no need for any backend system to allocate an RD value. 5.8. Site Network Access Availability A site may be multihomed, meaning that it has multiple site-network- access points. Placement constraints defined in previous sections will help ensure physical diversity. When the site-network-accesses are placed on the network, a customer may want to use a particular routing policy on those accesses. The "site-network-access/availability" container defines parameters for site redundancy. The "access-priority" leaf defines a preference for a particular access. This preference is used to model load-balancing or primary/backup scenarios. The higher the access-priority value, the higher the preference will be. The "redundancy mode" attribute is defined for an multi-homing site and used to model single-active and active/active scenarios. It allows for multiple active paths in forwarding state and for load-balancing options. The figure below describes how the access-priority attribute can be used. Wen, et al. Expires August 23, 2018 [Page 53] Internet-Draft L2VPN Service Model February 2018 Hub#1 LAN (Primary/backup) Hub#2 LAN (Load-sharing) | | | access-priority 1 access-priority 1 | |--- CE1 ------- PE1 PE3 --------- CE3 --- | | | | | |--- CE2 ------- PE2 PE4 --------- CE4 --- | | access-priority 2 access-priority 1 | PE5 | | | CE5 | Spoke#1 site (Single-homed) In the figure above, Hub#2 requires load-sharing, so all the site- network-accesses must use the same access-priority value. On the other hand, as Hub#1 requires a primary site-network-access and a backup site-network-access, a higher access-priority setting will be configured on the primary site-network-access. Scenarios that are more complex can also be modeled. Let's consider a Hub site with five accesses to the network (A1, A2, A3, A4, and A5). The customer wants to load-share its traffic on A1 and A2 in the nominal situation. If A1 and A2 fail, the customer wants to load-share its traffic on A3 and A4; finally, if all of A1 to A4 are down, he wants to use A5. We can model this easily by configuring the following access-priority values: A1=100, A2=100, A3=50, A4=50, A5=10. The access-priority scenario has some limitations. An access- priority scenario like the previous one with five accesses but with the constraint of having traffic load-shared between A3 and A4 in the case where just one of A1 or A2 is down is not achievable. But the access-priority attribute defined will cover most of the deployment use cases, and if necessary the model can be extended via augmentation to support additional use cases. 5.9. SVC MTU The maximum MTU of subscriber service frames can be derived from the physical interface MTU by default, or specified under the "svc-mtu" leaf if it is different than the default number. Wen, et al. Expires August 23, 2018 [Page 54] Internet-Draft L2VPN Service Model February 2018 5.10. Service The "service" container defines service parameters associated with the site. 5.10.1. Bandwidth The service bandwidth refers to the bandwidth requirement between CE and PE. The requested bandwidth is expressed as ingress bandwidth and egress bandwidth. Ingress/egress direction uses the customer site as the point of reference: Ingress direction bandwidth means download bandwidth for the site, and egresss bandwidth means upload bandwidth for the site. The service bandwidth is only configurable at the site-network-access level (i.e., for the site network access associated with the site). Using a different ingress and egress bandwidth will allow service provider to know if a customer allows for asymmetric bandwidth access like ADSL. It can also be used to set the rate limit in a different way for upload and download on symmetric bandwidth access. The svc-bandwidth has specific type. This document defines four types: o bw-per-access Bandwidth is per connection or site network access, providing rate enforcement for all service frames at the interface that are associated with a particular network access. o bw-per-cos Bandwidth is per cos, providing rate enforcement for all service frames for a given class of service with specific cos- id. o bw-per-svc bandwidth is per site, providing rate enforcement for all service frames that are associated with a particular VPN service. o opaque bandwidth is the total bandwidth that is not associated with any particular cos-id, vpn service identified with the vpn- id, or site network access id. The svc-bandwidth must include a "cos-id" parameter if the 'type' is set as 'bw-per-cos'. The cos-id can be assigned based on the dot1p value in the C-tag, or on the DSCP in the Ethernet Frame header. Service frames are metered against the bandwidth profile based on the cos-identifier. Wen, et al. Expires August 23, 2018 [Page 55] Internet-Draft L2VPN Service Model February 2018 The svc-bandwidth must be associated with a specific "site-network- access- id" parameter if the 'type' is set as 'bw-per-access'. Multiple bandwidths per cos-id can be associated with the same Site Network access. The svc-bandwidth must include a specific "vpn-id" parameter if the 'type' is set as 'bw-per-svc'. Multiple bandwidths per cos-id can be associated with the same Ethernet VPN service. 5.10.2. QoS The model defines QoS parameters as an abstraction: o qos-classification-policy: Defines a set of ordered rules to classify customer traffic. o qos-profile: Provides a QoS scheduling profile to be applied. 5.10.2.1. QoS Classification QoS classification rules are handled by qos-classification-policy. The qos-classification-policy is an ordered list of rules that match a flow or application and set the appropriate target class of service (target-class-id). The user can define the match using a more specific flow definition (based on layer 2 source and destination MAC addresses, cos, dscp, cos-id, color-id, etc.). A "color-id" will be assigned to a service frame to identify its QoS profile conformance. A service frame is "green" if it is conformant with the "committed" rate of the bandwidth profile. A Service Frame is "yellow" if it is exceeding the "committed" rate, but conformant with the "excess" rate of the bandwidth profile. Finally, a service frame is "red" if it is conformant with neither the "committed" nor "excess" rates of the bandwidth profile. When a flow definition is used, the user can use a target-sites leaf- list to identify the destination of a flow rather than using destination addresses. In such a case, an association between the site abstraction and the MAC addresses used by this site must be done dynamically. How this association is done is out of scope for this document. The association of a site to an L2VPN is done through the "vpn-attachment" container. Therefore, the user can also employ the "target-sites" leaf-list and "vpn-attachment" to identify the destination of a flow targeted to specific VPN service. A rule that does not have a match statement is considered as a match-all rule. A service provider may implement a default terminal classification rule if the customer does not provide it. It will be up to the service provider to determine its default target class. This model defines some applications, but new application identities may be added Wen, et al. Expires August 23, 2018 [Page 56] Internet-Draft L2VPN Service Model February 2018 through augmentation. The exact meaning of each application identity is up to the SP, so it will be necessary for the SP to advise the customer on the usage of application matching. 5.10.2.2. QoS Profile A user can choose between the standard profile provided by the operator or a custom profile. The qos-profile defines the traffic scheduling policy to be used by the service provider. A custom qos-profile is defined as a list of class of services and associated properties. The properties are: o direction: Used to specify the direction to which the qos-profile is applied. This model supports "Site-to-WAN" direction, "WAN-to- Site" direction, and "both" directions. By default, "both" directions is used. In case of "both" directions, the provider should ensure scheduling according to the requested policy in both traffic directions (SP to customer, and customer to SP). As an example, a device-scheduling policy may be implemented on both the PE side and the CE side of the WAN link. In case of "WAN-to-Site" direction, the provider should ensure scheduling from the SP network to the customer site. As an example, a device- scheduling policy may be implemented only on the PE side of the WAN link towards the customer. o policing: The optional "policing" indicates whether policing should apply to one-rate two-colors or to two-rates three-colors. o byte-offset: The optional "byte-offset" indicates how many bytes in the service frame header are excluded from rate enforcement. o frame-delay: Used to define the latency constraint of the class. The latency constraint can be expressed as the lowest possible latency, or as a latency boundary expressed in milliseconds. How this latency constraint will be fulfilled is up to the service provider implementation: a strict priority queueing mechanism may be used on the access and in the core network, or a low latency routing path may be created for this traffic class. o frame-jitter: Used to define the jitter constraint of the class. The jitter constraint can be expressed as the lowest possible jitter, or as a jitter boundary expressed in microseconds. How this jitter constraint will be fulfilled is up to the service provider implementation: a strict priority queueing mechanism may be used on the access and in the core network, or a jitter-aware routing path may be created for this traffic class. Wen, et al. Expires August 23, 2018 [Page 57] Internet-Draft L2VPN Service Model February 2018 o bandwidth: used to define a guaranteed amount of bandwidth for the class of service. It is expressed as a percentage. The "guaranteed-bw-percent" parameter uses available bandwidth as a reference. The available bandwidth should not fall below the Committed Information Rate (CIR) defined under svc-input-bandwidth or svc-output-bandwidth. When the qos-profile container is implemented on the CE side, svc-output-bandwidth is taken into account as a reference. When it is implemented on the PE side, svc-input-bandwidth is used. By default, the bandwidth reservation is only guaranteed at the access level. The user can use the "end-to-end" leaf to request an end-to-end bandwidth reservation, including across the MPLS transport network. (In other words, the SP will activate something in the MPLS core to ensure that the bandwidth request from the customer will be fulfilled by the MPLS core as well.) How this is done (e.g., RSVP-TE reservation, controller reservation) is out of scope for this document. In addition, due to network conditions, some constraints may not be completely fulfilled by the SP; in this case, the SP should advise the customer about the limitations. How this communication is done is out of scope for this document. 5.10.3. Broadcast Multicast Unknow Unicast Support The "broadcast-unknowunicast-multicast" container defines the type of site in the customer multicast service topology: source, receiver, or both. These parameters will help the management system optimize the multicast service. Multiple multicast group-to-port mappings can be created using the "multicast-gp-address-mapping" list. The "multicast-gp-address- mapping" defines multicast group address and port LAG number. Those parameters will help the SP select the appropriate association between interface and multicast group to fulfill the customer service requirement. The whole Layer-2 multicast frame (whether for data or control) SHOULD NOT be altered from CE to CEs except that the VLAN ID field may be modified, ensuring that it is transparently transported. If VLAN IDs are assigned by the SP, they can also be altered. For point-to-point services, the provider only needs to deliver a single copy of each service frame to the remote PE, regardless whether the destination MAC address of the incoming frame is unicast, multicast or broadcast. Therefore, all service frames should be delivered unconditionally. Wen, et al. Expires August 23, 2018 [Page 58] Internet-Draft L2VPN Service Model February 2018 B-U-M (Broadcast-UnknownUnicast-Multicast) frame forwarding in multipoint-to-multipoint services, on the other hand, involves both local flooding to other attachment circuits on the same PE and remote replication to all other PEs, thus consumes additional resources and core bandwidth. Special B-U-M frame disposition rules can be implemented at external facing interfaces (UNI or E-NNI) to rate- limit the B-U-M frames, in term of number of packets per second or bits per second. The threshold can apply to all B-U-M traffic, or one for each category. 5.11. Site Management The "management" sub-container is intended for site management options, depending on the device ownership and security access control. The followings are three common management models: CE Provider Managed: The provider has the sole ownership of the CE device. Only the provider has access to the CE. The responsibility boundary between SP and customer is between CE and customer network. This is the most common use case. CE Customer Managed: The customer has the sole ownership of the CE device. Only the customer has access to the CE. In this model, the responsibility boundary between SP and customer is between PE and CE. CE Co-managed: The provider has ownership of the CE device and responsible for managing the CE. However, the provider grants the customer access to the CE for some configuration/monitoring purposes. In this co-managed mode, the responsibility boundary is the same as for the provider-managed model. The selected management mode is specified under the "type" leaf. The "address" leaf stores CE device management addressing information. And the "management-transport" leaf is used to identify the transport protocol for management traffic: IPv4 or IPv6. Additional security options may be derived based on the particular management model selected. 5.12. MAC Loop Protection MAC address flapping between different physical ports typically indicates a bridge loop condition in the customer network. Misleading entries in the MAC cache table can cause service frames to circulate around the network indefinitely and saturate the links throughout the provider's network, affecting other services in the Wen, et al. Expires August 23, 2018 [Page 59] Internet-Draft L2VPN Service Model February 2018 same network. In case of EVPN, it also introduces massive BGP updates and control plane instability. The service provider may opt to implement a switching loop prevention mechanism at the external facing interfaces for multipoint-to- multipoint services by imposing a MAC address move threshold. The MAC move rate and prevention-type options are listed in the "mac- loop-prevention" container. 5.13. MAC Address Limit The optional "mac-address-limit" container contains the customer MAC address limit and information to describe the action when the limit is exceeded and the aging time for a MAC address. When multiple services are provided on the same network element, the MAC address table (and the Routing Information Base space for MAC- routes in the case of EVPN) is a shared common resource. Service providers may impose a maximum number of MAC addresses learned from the customer for a single service instance by using 'mac-limit'leaf, and may use 'action' leaf to specify the action when the upper limit is exceeded: drop the packet, flood the packet, or simply send a warning log message. For point-to-point services, if MAC learning is disabled then the MAC address limit is not necessary. 5.14. Enhanced VPN Features 5.14.1. Carriers' Carriers In the case of Carriers' Carrier (CsC) [RFC6624], a customer may want to build an MPLS service using an L2VPN to carry its traffic. Wen, et al. Expires August 23, 2018 [Page 60] Internet-Draft L2VPN Service Model February 2018 LAN customer1 | | CE1 | | ------------- (vrf_cust1) CE1_ISP1 | ISP1 POP | MPLS link | ------------- | (vrf ISP1) PE1 (...) Provider backbone PE2 (vrf ISP1) | | ------------ | | MPLS link | ISP1 POP CE2_ISP1 (vrf_cust1) | ------------ | CE2 | LAN customer1 In the figure above, ISP1 resells an L2VPN service but has no core network infrastructure between its POPs. ISP1 uses an L2VPN as the core network infrastructure (belonging to another provider) between its POPs. In order to support CsC, the VPN service must indicate MPLS support by setting the "carrierscarrier" leaf to true in the vpn-service list. The link between CE1_ISP1/PE1 and CE2_ISP1/PE2 must also run an MPLS signalling protocol. This configuration is done at the site level. In this model, LDP or BGP can be used as the MPLS signalling protocol. In the case of LDP, an IGP routing protocol MUST also be activated. In the case of BGP signalling, BGP MUST also be configured as the routing protocol. Wen, et al. Expires August 23, 2018 [Page 61] Internet-Draft L2VPN Service Model February 2018 If CsC is enabled, the requested "svc-mtu" leaf will refer to the MPLS MTU and not to the link MTU. 5.15. External ID References The service model sometimes refers to external information through identifiers. As an example, to order cloud-access to a particular cloud service provider (CSP), the model uses an identifier to refer to the targeted CSP. If a customer is directly using this service model as an API (through REST or NETCONF, for example) to order a particular service, the SP should provide a list of authorized identifiers. In the case of cloud-access, the SP will provide the associated identifiers for each available CSP. The same applies to other identifiers, such as std-qos-profile. How an SP provides the meanings of those identifiers to the customer is out of scope for this document. 5.16. Defining NNIs and Inter-AS support An autonomous system (AS) is a single network or group of networks that is controlled by a common system administration group and that uses a single, clearly defined routing protocol. In some cases, VPNs need to span different ASes in different geographic areas or span different SPs. The connection between ASes is established by the SPs and is seamless to the customer. Examples include: o A partnership between SPs (e.g., carrier, cloud) to extend their VPN services seamlessly. o An internal administrative boundary within a single SP (e.g., backhaul versus core versus data center). NNIs have to be defined to extend the VPNs across multiple ASes. [RFC4761] defines multiple flavors of VPN NNI implementation. Each implementation has pros and cons; this topic is outside the scope of this document. For example, in an Inter-AS option A, autonomous system border router (ASBR) peers are connected by multiple interfaces with at least one of those interfaces spanning the two ASes while being present in the same VPN. In order for these ASBRs to signal label blocks, they associate each interface with a Virtual Switching (MAC-VRF) instance and a BGP session. As a result, traffic between the back-to-back VPLS is Ethernet. In this scenario, the VPNs are isolated from each other, and because the traffic is Ethernet, QoS mechanisms that operate on Ethernet traffic can be applied to achieve customer service level agreements (SLAs). Wen, et al. Expires August 23, 2018 [Page 62] Internet-Draft L2VPN Service Model February 2018 -------- -------------- ----------- / \ / \ / \ | Cloud | | | | | | Provider |-----NNI-----| |----NNI---| Data Center | | #1 | | | | | \ / | | \ / -------- | | ----------- | | -------- | My network | ----------- / \ | | / \ | Cloud | | | | | | Provider |-----NNI-----| |---NNI---| L2VPN | | #2 | | | | Partner | \ / | | | | -------- | | | | \ / | | -------------- \ / | ----------- | NNI | | ------------------- / \ | | | | | | | L2VPN Partner | | | \ / ------------------- The figure above describes an SP network called "My network" that has several NNIs. This network uses NNIs to: o increase its footprint by relying on L2VPN partners. o connect its own data center services to the customer L2VPN. o enable the customer to access its private resources located in a private cloud owned by some CSPs. 5.16.1. Defining an NNI with the Option A Flavor Wen, et al. Expires August 23, 2018 [Page 63] Internet-Draft L2VPN Service Model February 2018 AS A AS B ------------------- ------------------- / \ / \ | | | | | ++++++++ Inter-AS link +++++++++ | | + +_______________+ + | | +(MAC-VRF1)--(VPN1)--(MAC-VRF1)+ | | + + + + | | + ASBR + + ASBR + | | + + + + | | +(MAC-VRF2)--(VPN2)--(MAC-VRF2)+ | | + +_______________+ + | | ++++++++ +++++++++ | | | | | | | | | | | | | | ++++++++ Inter-AS link +++++++++ | | + +_______________+ + | | +(MAC-VRF1)--(VPN1)--(MAC-VRF1)+ | | + + + + | | + ASBR + + ASBR + | | + + + + | | +(MAC-VRF2)--(VPN2)--(MAC-VRF2)+ | | + +_______________+ + | | ++++++++ +++++++++ | | | | | | | | | \ / \ / ------------------- ------------------- In option A, the two ASes are connected to each other with physical links on ASBRs. For resiliency purposes, there may be multiple physical connections between the ASes. A VPN connection -- physical or logical (on top of physical) -- is created for each VPN that needs to cross the AS boundary, thus providing a back-to-back VPLS model. From a service model's perspective, this VPN connection can be seen as a site. Let's say that AS B wants to extend some VPN connections for VPN C on AS A. The administrator of AS B can use this service model to order a site on AS A. All connection scenarios could be realized using the features of the current model. As an example, the figure above shows two physical connections that have logical connections per VPN overlaid on them. This could be seen as a multi- VPN scenario. Also, the administrator of AS B will be able to choose the appropriate routing protocol (e.g., E-BGP) to dynamically exchange routes between ASes. Wen, et al. Expires August 23, 2018 [Page 64] Internet-Draft L2VPN Service Model February 2018 This document assumes that the option A NNI flavor SHOULD re-use the existing VPN site modeling. Example: a customer wants its CSP A to attach its virtual network N to an existing L2VPN (VPN1) that he has from L2VPN SP B. CSP A L2VPN SP B ----------------- ----------- / \ / \ | | | | | | VM --| ++++++++ NNI ++++++++++ |--- VPN1 | | + +____________+ + | Site#1 | |-------+(MAC-VRF1)-(VPN1)-(MAC-VRF1)+ | | | + + + + | | | + ASBR + + ASBR + | | | + +____________+ + | | | ++++++++ ++++++++++ | | VM --| | | |--- VPN1 | |Virtual | | | Site#2 | |Network | | | | VM --| | | |--- VPN1 | | | | | Site#3 \ / \ / ----------------- ----------- | | VPN1 Site#4 To create the VPN connectivity, the CSP or the customer may use the L2VPN service model that SP B exposes. We could consider that, as the NNI is shared, the physical connection (bearer) between CSP A and SP B already exists. CSP A may request through a service model the creation of a new site with a single site-network-access (single- homing is used in the figure). As a placement constraint, CSP A may use the existing bearer reference it has from SP A to force the placement of the VPN NNI on the existing link. The XML below illustrates a possible configuration request to SP B: GOLD PLATINUM Wen, et al. Expires August 23, 2018 [Page 65] Internet-Draft L2VPN Service Model February 2018 VPN1 true true CSP_A_attachment NY1 NY US site-vpn-flavor-nni < network-access-id>CSP_A_VN1 vlan tagged dot1q 17 input-bw bw-per-cos 450000000 20000000 1000000000 200000000 bgp Wen, et al. Expires August 23, 2018 [Page 66] Internet-Draft L2VPN Service Model February 2018 12456487 spoke-role customer-managed The case described above is different from a scenario using the cloud-accesses container, as the cloud-access provides a public cloud access while this example enables access to private resources located in a CSP network. 5.16.2. Defining an NNI with the Option B Flavor AS A AS B ------------------- ------------------- / \ / \ | | | | | ++++++++ Inter-AS link ++++++++ | | + +_______________+ + | | + + + + | | + ASBR +<---MP-BGP---->+ ASBR + | | + + + + | | + +_______________+ + | | ++++++++ ++++++++ | | | | | | | | | | | | | | ++++++++ Inter-AS link ++++++++ | | + +_______________+ + | | + + + + | | + ASBR +<---MP-BGP---->+ ASBR + | | + + + + | | + +_______________+ + | | ++++++++ ++++++++ | | | | | | | | | \ / \ / ------------------- ------------------- Wen, et al. Expires August 23, 2018 [Page 67] Internet-Draft L2VPN Service Model February 2018 In option B, the two ASes are connected to each other with physical links on ASBRs. For resiliency purposes, there may be multiple physical connections between the ASes. The VPN "connection" between ASes is done by exchanging VPN routes through MP-BGP [RFC4761]. There are multiple flavors of implementations of such an NNI. For example: 1. The NNI is internal to the provider and is situated between a backbone and a data center. There is enough trust between the domains to not filter the VPN routes. So, all the VPN routes are exchanged. RT filtering may be implemented to save some unnecessary route states. 2. The NNI is used between providers that agreed to exchange VPN routes for specific RTs only. Each provider is authorized to use the RT values from the other provider. 3. The NNI is used between providers that agreed to exchange VPN routes for specific RTs only. Each provider has its own RT scheme. So, a customer spanning the two networks will have different RTs in each network for a particular VPN. Case 1 does not require any service modeling, as the protocol enables the dynamic exchange of necessary VPN routes. Case 2 requires that an RT-filtering policy on ASBRs be maintained. From a service modeling point of view, it is necessary to agree on the list of RTs to authorize. In Case 3, both ASes need to agree on the VPN RT to exchange, as well as how to map a VPN RT from AS A to the corresponding RT in AS B (and vice versa). Those modelings are currently out of scope for this document. Wen, et al. Expires August 23, 2018 [Page 68] Internet-Draft L2VPN Service Model February 2018 CSP A L3VPN SP B ----------------- ------------------ / \ / \ | | | | | | VM --| ++++++++ NNI ++++++++ |--- VPN1 | | + +__________+ + | Site#1 | |-------+ + + + | | | + ASBR +<-MP-BGP->+ ASBR + | | | + +__________+ + | | | ++++++++ ++++++++ | | VM --| | | |--- VPN1 | |Virtual | | | Site#2 | |Network | | | | VM --| | | |--- VPN1 | | | | | Site#3 \ / | | ----------------- | | \ / ------------------ | | VPN1 Site#4 The example above describes an NNI connection between CSP A and SP network B. The SPs do not trust each other and use different RT allocation policies. So, in terms of implementation, the customer VPN has a different RT in each network (RT A in CSP A and RT B in SP network B). In order to connect the customer's virtual network in CSP A to the customer's L2VPN (VPN1) in SP network B, CSP A should request that SP network B open the customer VPN on the NNI (accept the appropriate RT). Who does the RT translation depends on the agreement between the two SPs: SP B may permit CSP A to request VPN (RT) translation. 5.16.3. Defining an NNI with the Option C Flavor Wen, et al. Expires August 23, 2018 [Page 69] Internet-Draft L2VPN Service Model February 2018 AS A AS B ------------------- ------------------- / \ / \ | | | | | | | | | | | | | ++++++++ Multihop E-BGP ++++++++ | | + + + + | | + + + + | | + RGW +<----MP-BGP---->+ RGW + | | + + + + | | + + + + | | ++++++++ ++++++++ | | | | | | | | | | | | | | | | | | | | | | ++++++++ Inter-AS link ++++++++ | | + +_______________+ + | | + + + + | | + ASBR + + ASBR + | | + + + + | | + +_______________+ + | | ++++++++ ++++++++ | | | | | | | | | | | | | | ++++++++ Inter-AS link ++++++++ | | + +_______________+ + | | + + + + | | + ASBR + + ASBR + | | + + + + | | + +_______________+ + | | ++++++++ ++++++++ | | | | | | | | | \ / \ / ------------------- ------------------- From a VPN service's perspective, the option C NNI is very similar to option B, as an MP-BGP session is used to exchange VPN routes between the ASes. The difference is that the forwarding plane and the control plane are on different nodes, so the MP-BGP session is multihop between routing gateway (RGW) nodes. From a VPN service's point of view, modeling options B and C will be identical. Wen, et al. Expires August 23, 2018 [Page 70] Internet-Draft L2VPN Service Model February 2018 5.17. Applicability of L2SM model in Inter-Provider and Inter-Domain Orchestration In the case where the ASes belong to different providers, one might imagine that providers would like to have fewer signaling sessions crossing the AS boundary and that the entities that terminate the sessions could be restricted to a smaller set of devices. Two approaches can be taken: a. Inter-provider control connections to run only between the two border routers b. Allow an end-to-end, multi-segment connectivity to be constructed out of several connectivity segments, without maintaining an end- to-end control connection. Inter-provider control connection described in (a) can be realized using techniques of Section 5.15 (i.e., defining NNI). Multi-segment connectivity described in (b) can produce an inter-AS solution that more closely resembles option (b) in [RFC4364]. It may be realized using stitching of per-site connectivity and service segments at different domains, e.g., end-to-end connectivity between Site_1 and Site_3 spans multiple domains (e.g., Metro networks) and can be constructed by stitching network access connectivity within Site_1 with SEG1, SEG3, SEG4 and network access connectivity within Site_3 (as shown in the following figure). The assumption is that service the orchestration component in Figure 3 should have visibility of the complete abstract topology and resource availability. This may rely on network planning. Note that OVC can also be regarded as network access connectivity within a site and can be created as a normal site using L2SM service model. ---------- ---------- ---------- | | | | | | +--+ +---+ +---+ +--+ Site_1|PE|==SEG1==| |==SEG3==| |==SEG4==|PE|Site_3 +--+ +---+ | | +--+ | | | | | | ---------- | | | | | | | | +--+ +---+ | | +---+ +--+ Site_2|PE|==SEG2==| |==SEG5==| |==SEG6==| |==SEG7==|PE|Site_4 +--+ +---+ +---+ +---+ +--+ | | | | | | | | ---------- ---------- ---------- ---------- Wen, et al. Expires August 23, 2018 [Page 71] Internet-Draft L2VPN Service Model February 2018 In this figure, we use EBGP redistribution of L2VPN NLRIs from AS to neighboring AS. First, the PE routers use Internal BGP (IBGP) to redistribute L2VPN NLRIs either to an ASBR, or to a route reflector of which an ASBR is a client. The ASBR then uses EBGP to redistribute those L2VPN NLRI to an ASBR in another AS, which in turn distributes them to the PE routers in that AS, or perhaps to another ASBR which in turn distributes them, and so on. In this case, a PE can learn the address of an ASBR through which it could reach another PE to which it wishes to establish a connectivity. That is, a local PE will receive a BGP advertisement containing L2VPN NLRI corresponding to an L2VPN instance in which the local PE has some attached members. The BGP next-hop for that L2VPN NLRI will be an ASBR of the local AS. Then, rather than building a control connection all the way to the remote PE, it builds one only to the ASBR. A connectivity segment can now be established from the PE to the ASBR. The ASBR in turn can establish a connectivity to the ASBR of the next AS, and stitching that connectivity to the connectivity from the PE as described in [RFC6073]. Repeating the process at each ASBR leads to a sequence of connectivity segments that, when stitching together, connect the two PEs. Note that in the approach just described, the local PE may never learn the IP address of the remote PE. It learns the L2VPN NLRI advertised by the remote PE, which need not contain the remote PE address, and it learns the IP address of the ASBR that is the BGP next hop for that NLRI. When this approach is used for VPLS, or for full-mesh VPWS, it leads to a full mesh of connectivity among the PEs, but it does not require a full mesh of control connections (LDP or L2TPv3 sessions). Instead, the control connections within a single AS run among all the PEs of that AS and the ASBRs of the AS. A single control connection between the ASBRs of adjacent ASes can be used to support however many AS-to-AS connectivity segments are needed. 6. Interaction with Other YANG Modules As expressed in Section 4, this service module is not intended to configure the network element, but is instantiated in a management system. The management system might follow modular design and comprise at least two different components: a. The component instantiating the service model (let's call it the service component) Wen, et al. Expires August 23, 2018 [Page 72] Internet-Draft L2VPN Service Model February 2018 b. The component responsible for network element configuration (let's call it the configuration component) In some cases, when a split is needed between the behavior and functions that a customer requests and the technology that the network operator has available to deliver the service [RFC8309], a new component can be separated out of the service component (let's call it the control component). This component is responsible for network-centric operation and is aware of many features such as topology, technology, and operatorpolicy. As an optional component, it can use the service model as input and is not required at all if the control component delegates itscontrol operations to the configuration component. In Section 7 we provide some example of translation of service provisioning requests to router configuration lines as an illustration. In the NETCONF/YANG ecosystem, it is expected that NETCONF and YANG will be used between the configuration component and network elements to configure the requested service on those elements. In this framework, it is expected that YANG models will be used for configuring service components on network elements. There will be a strong relationship between the abstracted view provided by this service model and the detailed configuration view that will be provided by specific configuration models for network elements such as those defined in [I-D.ietf-bess-l2vpn-yang] and [I-D.ietf-bess-evpn-yang]. Service components needing configuration on network elements in support of the service model defined in this document include: o Network Instance definition including VPN policy expression. o Physical interface. o Ethernet layer (VLAN ID). o QoS: classification, profiles, etc. o Ethernet Service OAM Support. 7. Service Model Usage Example As explained in Section 4, this service model is intended to be instantiated at a management layer and is not intended to be used directly on network elements. The management system serves as a central point of configuration of the overall service. Wen, et al. Expires August 23, 2018 [Page 73] Internet-Draft L2VPN Service Model February 2018 This section provides an example on how a management system can use this model to configure an L2VPN service on network elements. The example is to provide a VPN service for 3 sites using point-to- point VPWS and a Hub and Spoke VPN service topology as shown in Figure 5. Loadbalancing is not considered in this case. Site1 ............ : : P2P VPWS :Spoke Site:-----PE1--------------------------+ : : | Site3 :..........: | ............ | : : PE3-----: Hub Site : Site2 | : : ............ | :..........: : : P2P VPWS | :Spoke Site:-----PE2--------------------------+ : : :..........: Figure 5: Reference Network for Simple Example The following XML describes the overall simplified service configuration of this VPN. Wen, et al. Expires August 23, 2018 [Page 74] Internet-Draft L2VPN Service Model February 2018 GOLD PLATINUM 12456487 vpws hub-spoke true true 12456488 vpws hub-spoke true true When receiving the request for provisioning the VPN service, the management system will internally (or through communication with another OSS component) allocates VPN route-targets. In this specific case two Route Targets (RTs) will be allocated (100:1 for Hubs and 100:2 for Spokes). The output below describes the configuration of Spoke Site1. GOLD PLATINUM Wen, et al. Expires August 23, 2018 [Page 75] Internet-Draft L2VPN Service Model February 2018 12456487 hub-spoke true true Spoke_Site1 NY1 NY US Spoke_UNI-Site1 20 vlan 17 tunnel true input-bw bw-per-cos 450000000 20000000 Wen, et al. Expires August 23, 2018 [Page 76] Internet-Draft L2VPN Service Model February 2018 1000000000 200000000 bgp 12456487 spoke-role provider-managed When receiving the request for provisioning the Spoke1 site, the management system MUST allocate network resources for this site. It MUST first determine the target network elements to provision the access, and especially the PE router (and may be an aggregation switch). As described in Section 5.3.1, the management system SHOULD use the location information and MUST use the access-diversity constraint to find the appropriate PE. In this case, we consider Spoke1 requires PE diversity with Hub and that management system allocate PEs based on lowest distance. Based on the location information, the management system finds the available PEs in the nearest area of the customer and picks one that fits the access- diversity constraint. When the PE is chosen, the management system needs to allocate interface resources on the node. One interface is selected from the PE available pool. The management system can start provisioning the PE node by using any mean (Netconf, CLI, ...). The management system will check if a VSI is already present that fits the needs. If not, it will provision the VSI: the Route Distinguisher will come from the internal allocation policy model, and the route-targets come from the vpn-policy configuration of the site (management system allocated some RTs for the VPN). As the site is a Spoke site (site-role), the management system knows which RT must be imported and exported. As the site is provider managed, some management route-targets may also be added (100:5000). Standard provider VPN policies MAY also be added in the configuration. Wen, et al. Expires August 23, 2018 [Page 77] Internet-Draft L2VPN Service Model February 2018 Example of generated PE configuration: l2vpn vsi context one vpn id 12456487 autodiscovery bgp signaling bgp ve id 1001 <----identify the PE routers within the VPLS domain ve range 50 <---- VE size route-distinguisher 100:3123234324 route-target import 100:1 route-target import 100:5000 <---- Standard SP configuration route-target export 100:2 for provider managed CE ! When the VSI has been provisioned, the management system can start configuring the access on the PE using the allocated interface information. The tag or VLAN (e.g., service instance tag)is chosen by the management system. One tag will be picked from an allocated subnet for the PE, another will be used for the CE configuration. LACP protocols will also be configured between PE and CE and due to provider managed model, the choice is up to service provider. This choice is independent of the LACP protocol chosen by customer. Example of generated PE configuration: Wen, et al. Expires August 23, 2018 [Page 78] Internet-Draft L2VPN Service Model February 2018 ! bridge-domain 1 member Ethernet0/0 service-instance 100 member vsi one ! l2 router-id 198.51.100.1 ! interface Ethernet0/0 no ip address service instance 100 ethernet encapsulation dot1q 100 ! ! router bgp 1 bgp log-neighbor-changes neighbor 198.51.100.4 remote-as 1 neighbor 198.51.100.4 update-source Loopback0 ! address-family l2vpn vpls neighbor 198.51.100.4 activate neighbor 198.51.100.4 send-community extended neighbor 198.51.100.4 suppress-signaling-protocol ldp exit-address-family ! interface vlan 100 <-- Associating the Attachment no ip address Circuit with the MAC-VRF at the PE xconnect vsi PE1-VPLS-A ! vlan 100 state active As the CE router is not reachable at this stage, the management system can produce a complete CE configuration that can be uploaded to the node by manual operation before sending the CE to customer premise. The CE configuration will be built as for the PE. Based on the CE type (vendor/model) allocated to the customer and bearer information, the management system knows which interface must be configured on the CE. PE-CE link configuration is expected to be handled automatically using the service provider OSS as both resources are managed internally. CE to LAN interface parameters like dot1Q tag are derived from the ethernet-connection taking into account how management system distributes dot1Q tag between PE and CE within subnet. This will allow to produce a plug'n'play configuration for the CE. Wen, et al. Expires August 23, 2018 [Page 79] Internet-Draft L2VPN Service Model February 2018 Example of generated CE configuration: interface Ethernet0/1 switchport trunk allowed vlan none switchport mode trunk service instance 100 ethernet encapsulation default l2protocol forward cdp xconnect 203.0.113.1 100 encapsulation mpls ! 8. YANG Module file "ietf-l2vpn-svc@2018-02-05.yang" module ietf-l2vpn-svc { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-l2vpn-svc"; prefix l2vpn-svc; import ietf-inet-types { prefix inet; } import ietf-yang-types { prefix yang; } import ietf-netconf-acm { prefix nacm; } organization "IETF L2SM Working Group."; contact "WG List: l2sm@ietf.org Editor: giuseppe.fioccola@telecomitalia.it"; description "The YANG module defines a generic service configuration model for Layer 2 VPN services common across all of the vendor implementations."; revision 2018-02-05 { description "Initial revision -04 version"; reference "draft-ietf-l2sm-l2vpn-service-model-05.txt A YANG Data Model for L2VPN Service Delivery."; } feature carrierscarrier { Wen, et al. Expires August 23, 2018 [Page 80] Internet-Draft L2VPN Service Model February 2018 description "Enables support of CsC."; } feature ethernet-oam { description "Enables support of ethernet OAM."; } feature extranet-vpn { description "Enable the Support of Extranet VPN."; } feature l2cp-control { description "Enable the Support of L2CP control."; } feature input-bw { description "Enable the suppport of Input Bandwidth in a VPN."; } feature output-bw { description "Enable the support of Output Bandwidth in a VPN"; } feature uni-list { description "Enable the support of UNI list in a VPN."; } feature cloud-access { description "Allow VPN to connect to a Cloud Service provider."; } feature oam-3ah { description "Enables the support of OAM 802.3ah."; } feature micro-bfd { description "Enables the support of Micro-BFD."; Wen, et al. Expires August 23, 2018 [Page 81] Internet-Draft L2VPN Service Model February 2018 } feature bfd { description "Enables the support of BFD."; } feature signaling-options { description "Enable the support of signaling option."; } feature site-diversity { description "Enables the support of site diversity constraints in a VPN."; } feature encryption { description "Enables support of encryption."; } feature always-on { description "Enables support for always-on access constraint."; } feature requested-type { description "Enables support for requested-type access constraint."; } feature bearer-reference { description "Enables support for bearer-reference access constraint."; } feature qos { description "Enables support of Class of Services."; } feature qos-custom { description "Enables support of custom qos profile."; Wen, et al. Expires August 23, 2018 [Page 82] Internet-Draft L2VPN Service Model February 2018 } feature lag-interface { description "Enable lag-interface."; } feature vlan { description "Enable the support of VLAN."; } feature dot1q { description "Enable the support of Dot1Q."; } feature sub-inf { description "Enable the support of Sub Interface."; } feature qinq { description "Enable the support of QinQ."; } feature qinany { description "Enable the support of QinAny."; } feature vxlan { description "Enable the support of VxLAN."; } feature lan-tag { description "Enables LAN Tag support in a VPN."; } feature target-sites { description "Enables support of the 'target-sites' match flow parameter."; } feature bum { Wen, et al. Expires August 23, 2018 [Page 83] Internet-Draft L2VPN Service Model February 2018 description "Enables broadcast,unknown-unicast,multicast capabilities in a VPN."; } feature mac-loop-prevention { description "Enables MAC Loop prevention capability in a VPN."; } feature lacp { description " Enables LACP capability in a VPN. "; } feature mac-addr-limit{ description "Enables MAC Address Limit capability in a VPN."; } feature acl { description "Enables ACL capability in a VPN. "; } feature cfm { description "Enables cfm 802.1 ag capability in a VPN."; } feature y-1731 { description "Enable Y.1731 capability in a VPN."; } typedef svc-id { type string; description "Defines a type of service component identifier."; } typedef ccm-priority-type { type uint8 { range "0..7"; } description "A 3 bits priority value to be used in the VLAN tag, if present in the transmitted frame."; Wen, et al. Expires August 23, 2018 [Page 84] Internet-Draft L2VPN Service Model February 2018 } typedef control-mode { type enumeration { enum "peer" { description "Peer mode, i.e., participate in the protocol towards the CE. Peering is common for LACP and E-LMI and occasionally for LLDP. For virtual private services the Subscriber can also request that the Service Provider peer spanning tree."; } enum "tunnel" { description "Tunnel mode,i.e.,pass to the egress or destination site. For EPL, the expectation is that L2CP frames are tunneled."; } enum "discard" { description "Discard mode,i.e.,discard the frame."; } } description "Defining a type of the control mode on L2CP protocols."; } typedef neg-mode { type enumeration { enum "full-duplex" { description "Defining Full duplex mode"; } enum "auto-neg" { description "Defining Auto negotiation mode"; } } description "Defining a type of the negotiation mode"; } identity site-network-access-type { description "Base identity for site-network-access type."; } identity point-to-point { base site-network-access-type; Wen, et al. Expires August 23, 2018 [Page 85] Internet-Draft L2VPN Service Model February 2018 description "Identity for point-to-point connection."; } identity multipoint { base site-network-access-type; description "Identity for multipoint connection. Example: Ethernet broadcast segment."; } identity tag-type { description "Base identity from which all tag types are derived from"; } identity c-vlan { base tag-type; description "A Customer-VLAN tag, normally using the 0x8100 Ethertype"; } identity s-vlan { base tag-type; description "A Service-VLAN tag."; } identity c-s-vlan { base tag-type; description "Using both Customer-VLAN tag and Service-VLAN tag."; } identity multicast-tree-type { description "Base identity for multicast tree type."; } identity ssm-tree-type { base multicast-tree-type; description "Identity for SSM tree type."; } identity asm-tree-type { Wen, et al. Expires August 23, 2018 [Page 86] Internet-Draft L2VPN Service Model February 2018 base multicast-tree-type; description "Identity for ASM tree type."; } identity bidir-tree-type { base multicast-tree-type; description "Identity for bidirectional tree type."; } identity mapping-type { description "Identity mapping-type"; } identity static-mapping { base mapping-type; description "Identity for static mapping, i.e.,attach the interface to the Multicast group as static member"; } identity dynamic-mapping { base mapping-type; description "Identity for dynamic mapping, i.e.,interface was added to the Multicast group as a result of snooping"; } identity tf-type { description "Identity traffic-type"; } identity multicast-traffic { base tf-type; description "Identity for multicast traffic"; } identity broadcast-traffic { base tf-type; description "Identity for broadcast traffic"; } identity unknown-unicast-traffic { Wen, et al. Expires August 23, 2018 [Page 87] Internet-Draft L2VPN Service Model February 2018 base tf-type; description "Identity for unknown unicast traffic"; } identity encapsulation-type { description "Identity for encapsulation type"; } identity ethernet { base encapsulation-type; description "Identity for ethernet type"; } identity vlan { base encapsulation-type; description "Identity for VLAN type"; } identity carrierscarrier-type { description "Identity of carrierscarrier"; } identity ldp { base carrierscarrier-type; description "Use LDP as the signalling protocol between the PE and the CE."; } identity bgp { base carrierscarrier-type; description "Use BGP (as per RFC 3107) as the signalling protocol between the PE and the CE. In this case, BGP must also be configured as the routing protocol."; } identity eth-inf-type { description "Identity of Ethernet Interface Type."; } Wen, et al. Expires August 23, 2018 [Page 88] Internet-Draft L2VPN Service Model February 2018 identity tagged { base eth-inf-type; description "Identity of tagged Interface type."; } identity untagged { base eth-inf-type; description "Identity of untagged Interface type."; } identity lag { base eth-inf-type; description "Identity of LAG Interface type"; } identity bw-type { description "Identity of bandwidth"; } identity bw-per-cos { base bw-type; description "Bandwidth is per cos"; } identity bw-per-port { base bw-type; description "Bandwidth is per site network access"; } identity bw-per-site { base bw-type; description "Bandwidth is per site. It is applicable to all the site network accesses within the site."; } identity bw-per-svc { base bw-type; description "Bandwidth is per VPN service"; } Wen, et al. Expires August 23, 2018 [Page 89] Internet-Draft L2VPN Service Model February 2018 identity site-vpn-flavor { description "Base identity for the site VPN service flavor."; } identity site-vpn-flavor-single { base site-vpn-flavor; description "Identity for the site VPN service flavor. Used when the site belongs to only one VPN."; } identity site-vpn-flavor-multi { base site-vpn-flavor; description "Identity for the site VPN service flavor. Used when a logical connection of a site belongs to multiple VPNs."; } identity site-vpn-flavor-nni { base site-vpn-flavor; description "Identity for the site VPN service flavor. Used to describe an NNI option A connection."; } identity service-type { description "Base Identity of service type."; } identity vpws { base service-type; description "point-to-point Virtual Private Wire Services(VPWS) type."; } identity pwe3 { base service-type; description "Pseudo-Wire Emulation Edge to Edge(PWE3)Service type. ."; } identity ldp-l2tp-vpls { base service-type; description Wen, et al. Expires August 23, 2018 [Page 90] Internet-Draft L2VPN Service Model February 2018 "LDP based or L2TP based multipoint Virtual Private LAN services (VPLS) Service Type.This VPLS uses LDP-signaled Pseudowires or L2TP signaled Pseudowires."; } identity bgp-vpls { base service-type; description "BGP based multipoint Virtual Private LAN services (VPLS) Service Type. This VPLS uses a Border Gateway Protocol (BGP) control plane as described in RFC4761 and RFC6624."; } identity vpws-evpn { base service-type; description "VPWS Service Type using Ethernet VPN(EVPN) specified in RFC 7432."; } identity pbb-evpn { base service-type; description "PBB Service Type using Ethernet VPN(EVPN) specified in RFC 7432."; } identity bundling-type { description "This is base identity for Bundling type. It supports multiple CE-VLAN associated with L2VPN service or all CE-VLANs associated with L2VPN service."; } identity multi-svc-bundling { base bundling-type; description "Identity for multiple service bundling,i.e., multiple CE-VLAN IDs can be associated with an L2VPN Service at site."; } identity one2one-bundling { base bundling-type; description "Identity for one to one service bundling,i.e., Each L2VPN can be associated with only one CE-VLAN IDs at site."; Wen, et al. Expires August 23, 2018 [Page 91] Internet-Draft L2VPN Service Model February 2018 } identity all2one-bundling { base bundling-type; description "Identity for all to one bundling,i.e.,all CE-VLAN IDs are mapped to one L2VPN Service"; } identity color-id { description "base identity of color id"; } identity color-id-cvlan { base color-id; description "Identity of color id base on CVLAN "; } identity cos-id { description "Identity of class of service id"; } identity cos-id-pcp { base cos-id; description "Identity of cos id based on PCP"; } identity cos-id-dscp { base cos-id; description "Identity of cos id based on DSCP"; } identity color-type { description "Identity of color types"; } identity green { base color-type; description "Identity of green type"; } Wen, et al. Expires August 23, 2018 [Page 92] Internet-Draft L2VPN Service Model February 2018 identity yellow { base color-type; description "Identity of yellow type"; } identity red { base color-type; description "Identity of red type"; } identity policing { description "Identity of policing type"; } identity one-rate-two-color { base policing; description "Identity of one-rate, two-color (1R2C)."; } identity two-rate-three-color { base policing; description "Identity of two-rate, three-color (2R3C)."; } identity bum-type { description "Identity of BUM type."; } identity broadcast { base bum-type; description "Identity of broadcast."; } identity unicast { base bum-type; description "Identity of unicast"; } identity multicast { base bum-type; Wen, et al. Expires August 23, 2018 [Page 93] Internet-Draft L2VPN Service Model February 2018 description "Identity of multicast."; } identity loop-prevention-type { description "Identity of loop prevention."; } identity shut { base loop-prevention-type; description "Identity of shut protection."; } identity trap { base loop-prevention-type; description "Identity of trap protection."; } identity lacp-state { description "Identity of LACP state."; } identity lacp-on { base lacp-state; description "Identity of LCAP on."; } identity lacp-off { base lacp-state; description "Identity of LACP off"; } identity lacp-mode { description "Identity of LACP mode"; } identity lacp-passive { base lacp-mode; description "Identity of LACP passive"; } Wen, et al. Expires August 23, 2018 [Page 94] Internet-Draft L2VPN Service Model February 2018 identity lacp-active { base lacp-mode; description "Identity of LACP active"; } identity lacp-speed { description "Identity of LACP speed"; } identity lacp-fast { base lacp-speed; description "Identity of LACP fast"; } identity lacp-slow { base lacp-speed; description "Identity of LACP slow"; } identity bw-direction { description "Identity for bandwidth direction"; } identity input-bw { base bw-direction; description "Identity for input bandwidth"; } identity output-bw { base bw-direction; description "Identity for output bandwidth"; } identity management { description "Base identity for site management scheme."; } identity co-managed { base management; description Wen, et al. Expires August 23, 2018 [Page 95] Internet-Draft L2VPN Service Model February 2018 "Identity for co-managed site."; } identity customer-managed { base management; description "Identity for customer managed site."; } identity provider-managed { base management; description "Identity for provider managed site."; } identity address-family { description "Identity for an address family."; } identity ipv4 { base address-family; description "Identity for IPv4 address family."; } identity ipv6 { base address-family; description "Identity for IPv6 address family."; } identity vpn-topology { description "Base identity for VPN topology."; } identity any-to-any { base vpn-topology; description "Identity for any to any VPN topology."; } identity hub-spoke { base vpn-topology; description "Identity for Hub'n'Spoke VPN topology."; } Wen, et al. Expires August 23, 2018 [Page 96] Internet-Draft L2VPN Service Model February 2018 identity hub-spoke-disjoint { base vpn-topology; description "Identity for Hub'n'Spoke VPN topology where Hubs cannot talk between each other."; } identity site-role { description "Base identity for site type."; } identity any-to-any-role { base site-role; description "Site in an any to any L2VPN."; } identity spoke-role { base site-role; description "Spoke Site in a Hub-and-Spoke L2VPN."; } identity hub-role { base site-role; description "Hub Site in a Hub-and-Spoke L2VPN."; } identity pm-type { description "Performance monitor type"; } identity loss { base pm-type; description "Loss measurement"; } identity delay { base pm-type; description "Delay measurement"; } identity fault-alarm-defect-type { Wen, et al. Expires August 23, 2018 [Page 97] Internet-Draft L2VPN Service Model February 2018 description "Indicating the alarm priority defect"; } identity remote-rdi { base fault-alarm-defect-type; description "Indicates the aggregate health of the remote MEPs."; } identity remote-mac-error { base fault-alarm-defect-type; description "Indicates that one or more of the remote MEPs is reporting a failure in its Port Status TLV or Interface Status TLV."; } identity remote-invalid-ccm { base fault-alarm-defect-type; description "Indicates that at least one of the Remote MEP state machines is not receiving valid CCMs from its remote MEP."; } identity invalid-ccm { base fault-alarm-defect-type; description "Indicates that one or more invalid CCMs has been received and that 3.5 times that CCMs transmission interval has not yet expired."; } identity cross-connect-ccm { base fault-alarm-defect-type; description "Indicates that one or more cross connect CCMs has been received and that 3.5 times of at least one of those CCMs transmission interval has not yet expired."; } identity frame-delivery-mode { description "Delivery types"; } Wen, et al. Expires August 23, 2018 [Page 98] Internet-Draft L2VPN Service Model February 2018 identity discard { base frame-delivery-mode; description "Service Frames are discarded."; } identity unconditional { base frame-delivery-mode; description "Service Frames are unconditionally delivered to the destination."; } identity unknown-discard { base frame-delivery-mode; description "Service Frame are conditionally delivered to the destination site and the packet with unknown destination address will be discarded."; } identity placement-diversity { description "Base identity for site placement constraints."; } identity bearer-diverse { base placement-diversity; description "Identity for bearer diversity. The bearers should not use common elements."; } identity pe-diverse { base placement-diversity; description "Identity for PE diversity"; } identity pop-diverse { base placement-diversity; description "Identity for POP diversity"; } identity linecard-diverse { Wen, et al. Expires August 23, 2018 [Page 99] Internet-Draft L2VPN Service Model February 2018 base placement-diversity; description "Identity for linecard diversity"; } identity same-pe { base placement-diversity; description "Identity for having sites connected on the same PE"; } identity same-bearer { base placement-diversity; description "Identity for having sites connected using the same bearer"; } identity tagged-inf-type { description "Identity for the tagged interface type."; } identity priority-tagged { base tagged-inf-type; description "This identity the priority-tagged interface."; } identity qinq { base tagged-inf-type; description "Identity for the qinq tagged interface."; } identity dot1q { base tagged-inf-type; description "Identity for dot1q vlan tagged interface."; } identity qinany { base tagged-inf-type; description "Identity for qinany tagged inteface."; } Wen, et al. Expires August 23, 2018 [Page 100] Internet-Draft L2VPN Service Model February 2018 identity vxlan { base tagged-inf-type; description "Identity for vxlan tagged inteface."; } identity provision-model { description "base identity for provision model."; } identity single-side-provision { description "Identity for single side provisioning with discovery."; } identity doubled-side-provision { description "Identity for double side provisioning."; } identity mac-learning-mode { description "MAC learning mode"; } identity data-plane { base mac-learning-mode; description "User MAC addresses are learned through ARP broadcast."; } identity control-plane { base mac-learning-mode; description "User MAC addresses are advertised through EVPN-BGP"; } identity vpn-policy-filter-type { description "Base identity for filter type."; } identity lan { base vpn-policy-filter-type; description "Identity for lan tag filter type."; } Wen, et al. Expires August 23, 2018 [Page 101] Internet-Draft L2VPN Service Model February 2018 identity mac-action { description "Base identity for MAC action."; } identity drop { base mac-action; description "Identity for packet drop."; } identity flood { base mac-action; description "Identity for packet flooding."; } identity warning { base mac-action; description "Identity for sending a warning log message."; } identity load-balance-method { description "Base identity for load balance method."; } identity fat-pw { base load-balance-method; description "Identity for Fat PW. Fat label is applied to Pseudowires across MPLS network."; } identity entropy-label { base load-balance-method; description "Identity for entropy label.Entropy label is applied to IP forwarding, L2VPN or L3VPN across MPLS network"; } identity vxlan-source-port { base load-balance-method; description "Identity for vxlan source port.VxLAN Wen, et al. Expires August 23, 2018 [Page 102] Internet-Draft L2VPN Service Model February 2018 Source Port is one load balancing method."; } identity qos-profile-direction { description "Base identity for qos profile direction."; } identity site-to-wan { base qos-profile-direction; description "Identity for Site to WAN direction."; } identity wan-to-site { base qos-profile-direction; description "Identity for WAN to Site direction."; } identity bidirectional { base qos-profile-direction; description "Identity for both WAN to Site direction and Site to WAN direction."; } identity vxlan-peer-mode { description "Base identity for vxlan peer mode."; } identity static-mode { base vxlan-peer-mode; description "Identity for the vxlan access in static mode."; } identity bgp-mode { base vxlan-peer-mode; description "Identity for the vxlan access by bgp evpn learning."; } identity customer-application { description "Base identity for customer application."; } Wen, et al. Expires August 23, 2018 [Page 103] Internet-Draft L2VPN Service Model February 2018 identity web { base customer-application; description "Identity for Web application (e.g., HTTP, HTTPS)."; } identity mail { base customer-application; description "Identity for mail application."; } identity file-transfer { base customer-application; description "Identity for file transfer application (e.g., FTP, SFTP)."; } identity database { base customer-application; description "Identity for database application."; } identity social { base customer-application; description "Identity for social-network application."; } identity games { base customer-application; description "Identity for gaming application."; } identity p2p { base customer-application; description "Identity for peer-to-peer application."; } identity network-management { base customer-application; description "Identity for management application (e.g., Telnet, syslog, SNMP)."; Wen, et al. Expires August 23, 2018 [Page 104] Internet-Draft L2VPN Service Model February 2018 } identity voice { base customer-application; description "Identity for voice application."; } identity video { base customer-application; description "Identity for video conference application."; } identity embb { base customer-application; description "Identity for enhanced Mobile Broadband(eMBB) application. Note that eMBB application demands the network performance with wide variety of characteristics such as data rate, latency, loss rate, reliability and many other parameters."; } identity urllc { base customer-application; description "Identity for Ultra-Reliable and Low Latency Communications (URLLC) application. Note that URLLC application demands the network performance with wide variety of characteristics such as latency, reliability and many other parameters."; } identity mmtc { base customer-application; description "Identity for massive Machine Type Communications (mMTC) application. Note that mMTC application demands the network performance with wide variety of characteristics such as data rate, latency, loss rate, reliability and many other parameters."; } grouping vpn-service-cloud-access { container cloud-accesses { if-feature cloud-access; Wen, et al. Expires August 23, 2018 [Page 105] Internet-Draft L2VPN Service Model February 2018 list cloud-access { key "cloud-identifier"; leaf cloud-identifier { type leafref { path "/l2vpn-svc/vpn-profiles/valid-provider-identifiers"+ "/cloud-identifier/id"; } description "Identification of cloud service. Local administration meaning."; } choice list-flavor { case permit-any { leaf permit-any { type empty; description "Allow all sites."; } } case deny-any-except { leaf-list permit-site { type leafref { path "/l2vpn-svc/sites/site/site-id"; } description "Site ID to be authorized."; } } case permit-any-except { leaf-list deny-site { type leafref { path "/l2vpn-svc/sites/site/site-id"; } description "Site ID to be denied."; } } description "Choice for cloud access policy. By default, all sites in the L2VPN MUST be authorized to access the cloud."; } description "Cloud access configuration."; } description "Container for cloud access configurations"; } Wen, et al. Expires August 23, 2018 [Page 106] Internet-Draft L2VPN Service Model February 2018 description "Grouping for vpn cloud definition"; } grouping site-vpn-flavor { leaf site-vpn-flavor { type identityref { base site-vpn-flavor; } default "site-vpn-flavor-single"; description "Defines the way the VPN multiplexing is done ,e.g.,whether the site belongs to a single VPN site or a multiVPN; By default, the site belongs to a single VPN."; } description "Grouping for site VPN flavor."; } grouping site-device { container devices { when "derived-from-or-self(../management/type, "+ "'l2vpn-svc:provider-managed') or "+ "derived-from-or-self(../management/type, "+ "'l2vpn-svc:co-managed')" { description "Applicable only for provider-managed or co-managed device."; } list device { key "device-id"; leaf device-id { type string; description "Identifier for the device."; } leaf location { type leafref { path "../../../locations/location/location-id"; } mandatory true; description "Location of the device."; } container management { when "derived-from-or-self(../../../management/type,"+ "'l2vpn-svc:co-managed')" { Wen, et al. Expires August 23, 2018 [Page 107] Internet-Draft L2VPN Service Model February 2018 description "Applicable only for co-managed device."; } leaf transport { type identityref { base address-family; } description "Transport protocol or Address family used for management."; } leaf address { when "(../ transport)" { description "If address-family is specified, then address should also be specified. If the transport is not specified, then address should also not be specified."; } type inet:ip-address; description "Management address."; } description "Management configuration. Applicable only for co-managed device."; } description "List of devices requested by customer."; } description "Devices configuration"; } description "Device parameters for the site."; } grouping site-management { container management { leaf type { type identityref { base management; } mandatory true; description "Management type of the connection."; } description "Management configuration."; Wen, et al. Expires August 23, 2018 [Page 108] Internet-Draft L2VPN Service Model February 2018 } description "Management parameter for the site."; } grouping site-vpn-policy { container vpn-policies { list vpn-policy { key "vpn-policy-id"; leaf vpn-policy-id { type string; description "Unique identifier for the VPN policy."; } list entries { key "id"; leaf id { type string; description "Unique identifier for the policy entry."; } container filters { list filter { key "type"; ordered-by user; leaf type { type identityref { base vpn-policy-filter-type; } description "Type of VPN Policy filter."; } leaf-list lan-tag { when "derived-from-or-self(../type, 'l2vpn-svc:lan')" { description "Only applies when VPN Policy filter is LAN Tag filter."; } if-feature lan-tag; type uint32; description "List of Ethernet LAN Tag to be matched. Ethernet LAN Tag identifies a particular broadcast domain in a VPN. "; } description "List of filters used on the site. This list can be augmented."; Wen, et al. Expires August 23, 2018 [Page 109] Internet-Draft L2VPN Service Model February 2018 } description "If a more-granular VPN attachment is necessary, filtering can be used. If used, it permits the splitting of site LANs among multiple VPNs. The Site LAN can be split based on either LAN-tag or LAN prefix. If no filter is used, all the LANs will be part of the same VPNs with the same role."; } list vpn { key "vpn-id"; leaf vpn-id { type leafref { path "/l2vpn-svc/vpn-services/vpn-service/vpn-id"; } description "Reference to L2VPN."; } leaf site-role { type identityref { base site-role; } default "any-to-any-role"; description "Role of the site in the L2VPN."; } description "List of VPNs the LAN is associated with."; } description "List of entries for export policy."; } description "List of VPN policies."; } description "VPN policy."; } description "VPN policy parameters for the site."; } grouping bum-frame-delivery { container bum-frame-delivery { list bum-frame-delivery { key "frame-type"; leaf frame-type { Wen, et al. Expires August 23, 2018 [Page 110] Internet-Draft L2VPN Service Model February 2018 type identityref { base tf-type; } description "Type of frame delivery. It support unicast frame delivery, multicast frame delivery and broadcast frame delivery."; } leaf delivery-mode { type identityref { base frame-delivery-mode; } default "unconditional"; description "Define Frame Delivery Mode (unconditional[default], conditional, or discard). By default, Service Frames are unconditionally delivered to the destination. "; } description "List of frame delivery type and mode."; } description "Define frame delivery type and mode."; } description "Grouping for unicast, mulitcast, broadcast frame delivery"; } grouping cvlan-svc-map-grouping { list cvlan-id-to-svc-map { key "svc-id"; leaf svc-id { type leafref { path "/l2vpn-svc/vpn-services/vpn-service/vpn-id"; } description "VPN Service identifier"; } list cvlan-id { key "vid"; leaf vid { type uint16; description "CVLAN ID"; } Wen, et al. Expires August 23, 2018 [Page 111] Internet-Draft L2VPN Service Model February 2018 description "List of CVLAN-ID to SVC Map configurations"; } description "List for cvlan-id to L2VPn Service map configurations"; } description "Grouping for cvlan to L2VPN service mapping"; } grouping customer-location-info { container locations { list location { key "location-id"; leaf location-id { type string; description "Location ID"; } leaf address { type string; description "Address (number and street) of the site."; } leaf zip-code { type string; description "ZIP code of the site."; } leaf state { type string; description "State of the site. This leaf can also be used to describe a region for country who does not have states."; } leaf city { type string; description "City of the site."; } leaf country-code { type string; description "Country of the site."; } description "List for location"; Wen, et al. Expires August 23, 2018 [Page 112] Internet-Draft L2VPN Service Model February 2018 } description "Location of the site."; } description "This grouping defines customer location parameters"; } grouping site-diversity { container site-diversity { if-feature site-diversity; container groups { list group { key "group-id"; leaf group-id { type string; description "Group-id the site is belonging to"; } description "List of group-id"; } description "Groups the site is belonging to. All site network accesses will inherit those group values."; } description "Diversity constraint type."; } description "This grouping defines site diversity parameters"; } grouping vpn-service-multicast { container frame-delivery { if-feature bum; container customer-tree-flavors { leaf-list tree-flavor { type identityref { base multicast-tree-type; } description "Type of tree to be used."; } description "Type of trees used by customer."; } Wen, et al. Expires August 23, 2018 [Page 113] Internet-Draft L2VPN Service Model February 2018 uses bum-frame-delivery; leaf multicast-gp-port-mapping { type identityref { base mapping-type; } mandatory true; description "Describe the way in which each interface is associated with the Multicast group"; } description "Multicast global parameters for the VPN service."; } description "Grouping for multicast VPN definition."; } grouping vpn-extranet { container extranet-vpns { if-feature extranet-vpn; list extranet-vpn { key "vpn-id"; leaf vpn-id { type svc-id; description "Identifies the target VPN the local VPN want to access."; } leaf local-sites-role { type identityref { base site-role; } default "any-to-any-role"; description "This describes the role of the local sites in the target VPN topology. In the any-to-any VPN service topology, the local sites must have the same role, which will be 'any-to-any-role '. In the Hub-and-Spoke VPN service topology or the Hub and Spoke disjoint VPN service topology, the local sites must have a Hub role or a Spoke role"; } description "List of extranet VPNs the local VPN is attached to."; } description "Container for extranet VPN configuration."; } description Wen, et al. Expires August 23, 2018 [Page 114] Internet-Draft L2VPN Service Model February 2018 "Grouping for extranet VPN configuration. This provides an easy way to interconnect all sites from two VPNs."; } grouping operational-requirements-ops { leaf actual-site-start { type yang:date-and-time; config false; description "Optional leaf indicating actual date and time when the service at a particular site actually started"; } leaf actual-site-stop { type yang:date-and-time; config false; description "Optional leaf indicating actual date and time when the service at a particular site actually stopped"; } leaf bundling-type { type identityref { base bundling-type; } default "one2one-bundling"; description "Bundling type. By default, Each L2VPN can be associated with only one CE-VLAN ,i.e., one to one bundling is used."; } leaf default-ce-vlan-id { type uint32; mandatory true; description "Default CE VLAN ID set at site level."; } description "This grouping defines some operational parameters Parameters."; } grouping cfm-8021-ag { list cfm-8021-ag { if-feature cfm; key "maid"; leaf maid { Wen, et al. Expires August 23, 2018 [Page 115] Internet-Draft L2VPN Service Model February 2018 type string; mandatory true; description "Identify an Maintenance Association (MA)."; } leaf mep-id { type uint32; description "Local Maintenance End Point (MEP) ID. The non-existence of this leaf means that no defects are to be reported."; } leaf mep-level { type uint32; description "Define Maintenance End Point (MEP) level. The non-existence of this leaf means that no defects are to be reported."; } leaf mep-up-down { type enumeration { enum "up" { description "MEP up."; } enum "down" { description "MEP down."; } } default "up"; description "MEP up/down. By default, MEP up is used. The non-existence of this leaf means that no defects are to be reported."; } leaf remote-mep-id { type uint32; description "Remote MEP ID. The non-existence of this leaf means that no defects are to be reported."; } leaf cos-for-cfm-pdus { type uint32; description "COS for CFM PDUs. The non-existence of this leaf means that no defects are to be reported."; } Wen, et al. Expires August 23, 2018 [Page 116] Internet-Draft L2VPN Service Model February 2018 leaf ccm-interval { type uint32; units "msec"; default "10000"; description "Continuity Check Message(CCM) interval. By default, ccm-interval is 10 seconds."; } leaf ccm-holdtime { type uint32; units "msec"; default "35000"; description "CCM hold time. By default ccm hold time is 3.5 times of ccm interval."; } leaf alarm-priority-defect { type identityref { base fault-alarm-defect-type; } default "remote-invalid-ccm"; description "The lowest priority defect that is allowed to generate a Fault Alarm.By default, fault-alarm-defect-type is set to remote-invalid-ccm. The non-existence of this leaf means that no defects are to be reported."; } leaf ccm-p-bits-pri { type ccm-priority-type; description "The priority parameter for CCMs transmitted by the MEP. The non-existence of this leaf means that no defects are to be reported."; } description "List of 802.1ag CFM attributes"; } description "Grouping for 802.1ag CFM attributes."; } grouping y-1731 { list y-1731 { if-feature y-1731; key "maid"; leaf maid { type string; Wen, et al. Expires August 23, 2018 [Page 117] Internet-Draft L2VPN Service Model February 2018 mandatory true; description "Identify an Maintenance Association (MA)."; } leaf mep-id { type uint32; description "Local Maintenance End Point(MEP) ID. The non-existence of this leaf means that no measurements are to be reported."; } leaf type { type identityref { base pm-type; } default "delay"; description "Performance monitor types. By default, the performance monitoring type is set to delay. The non-existence of this leaf means that no measurements are to be reported."; } leaf remote-mep-id { type uint32; description "Remote MEP ID. The non-existence of this leaf means that no measurements are to be reported."; } leaf message-period { type uint32; units "msec"; default "10000"; description "Defines the interval between Y.1731 performance monitoring messages. The message period is expressed in milliseconds."; } leaf measurement-interval { type uint32; units "sec"; description "Specifies the measurement interval for statistics. The measurement interval is expressed in seconds."; } leaf cos { type uint32; description Wen, et al. Expires August 23, 2018 [Page 118] Internet-Draft L2VPN Service Model February 2018 "Class of service. The non-existence of this leaf means that no measurements are to be reported."; } leaf loss-measurement { type boolean; default "false"; description "Whether enable loss measurement. By default, loss measurement is not enabled."; } leaf synthethic-loss-measurement { type boolean; default "false"; description "Indicate whether enable synthetic loss measurement.By default, synthethic loss measurement is not enabled."; } container delay-measurement { leaf enable-dm { type boolean; default "false"; description "Whether to enable delay measurement. By defaut, the delay measurement is not enabled."; } leaf two-way { type boolean; default "false"; description "Whether delay measurement is two-way (true) of one- way (false). By default, one way measurement is enabled."; } description "Container for delay measurement."; } leaf frame-size { type uint32; units "bytes"; description "Frame size. The non-existence of this leaf means that no measurements are to be reported."; } leaf session-type { type enumeration { Wen, et al. Expires August 23, 2018 [Page 119] Internet-Draft L2VPN Service Model February 2018 enum "proactive" { description "Proactive mode."; } enum "on-demand" { description "On demand mode."; } } default "on-demand"; description "Session type. By default, the session type is on demand mode. The non-existence of this leaf means that no measurements are to be reported."; } description "List for y-1731."; } description "Grouping for y.1731."; } grouping site-acl { container access-control-list { if-feature acl; list mac { key "mac-address"; leaf mac-address { type yang:mac-address; description "MAC address."; } description "List for MAC."; } description "Container for access control List."; } description "This grouping defines Access Control List."; } grouping lacp { container lacp { if-feature lacp; leaf enable { type boolean; default "false"; Wen, et al. Expires August 23, 2018 [Page 120] Internet-Draft L2VPN Service Model February 2018 description "LACP on/off.By default, LACP is disabled."; } leaf mode { type neg-mode; description "LACP mode. LACP modes have auto negotiation mode and passive mode (false). Auto negotiation mode means initiating the auto speed negotiation and trying to form Ethernet Channel with other end. Passive mode means not initiating the negotiation, but responding to LACP packets initiated by other end(e.g., full duplex or half duplex. "; } leaf speed { type uint32; units "mbps"; default "10"; description "LACP speed. By default, the lacp speed is 10Mbps."; } leaf mini-link-num { type uint32; description "Defines the minimum number of links that must be active before the aggregating link is put into service."; } leaf system-priority { type uint16; default "32768"; description "Indicates the LACP priority for the system. The range is from 0 to 65535. The default is 32768."; } container micro-bfd { if-feature micro-bfd; leaf enable { type enumeration { enum "on" { description "Micro-bfd on."; } enum "off" { description "Micro-bfd off."; } Wen, et al. Expires August 23, 2018 [Page 121] Internet-Draft L2VPN Service Model February 2018 } default "off"; description "Micro BFD ON/OFF. By default, the micro-bfd is set to off."; } leaf interval { type uint32; units "msec"; description "BFD interval."; } leaf hold-timer { type uint32; units "msec"; description "BFD hold timer."; } description "Container of Micro-BFD configurations."; } container bfd { if-feature bfd; leaf enabled { type boolean; default "false"; description "BFD activation. By default, BFD is not activated."; } choice holdtime { default "fixed"; case profile { leaf profile-name { type leafref { path "/l2vpn-svc/vpn-profiles/"+ "valid-provider-identifiers"+ "/bfd-profile-identifier/id"; } description "Service provider well known profile."; } description "Service provider well known profile."; } case fixed { leaf fixed-value { type uint32; units "msec"; Wen, et al. Expires August 23, 2018 [Page 122] Internet-Draft L2VPN Service Model February 2018 description "Expected hold time expressed in msec."; } } description "Choice for hold time flavor."; } description "Container for BFD."; } container member-links { list member-link { key "name"; leaf name { type string; description "Member link name."; } leaf speed { type uint32; units "mbps"; default "10"; description "Port speed."; } leaf mode { type neg-mode; default "auto-neg"; description "Negotiation mode."; } leaf link-mtu { type uint32; units "bytes"; description "Link MTU size."; } container oam-802.3ah-link { if-feature oam-3ah; leaf enable { type boolean; default "false"; description "Indicate whether oam 802.3 ah link is supported."; } description "Container for oam 802.3 ah link."; } Wen, et al. Expires August 23, 2018 [Page 123] Internet-Draft L2VPN Service Model February 2018 description "Member link"; } description "Container of Member link list"; } leaf flow-control { type boolean; default "false"; description "Flow control. Indicate whether flow control is supported."; } leaf lldp { type boolean; default "false"; description "LLDP. Indicate whether lldp is supported."; } description "LACP."; } description "Grouping for LACP."; } grouping untagged-interface-grouping { container untagged-interface { leaf speed { type uint32; units "mbps"; default "10"; description "Port speed."; } leaf mode { type neg-mode; default "auto-neg"; description "Negotiation mode."; } leaf phy-mtu { type uint32; units "bytes"; description "PHY MTU."; } leaf lldp { type boolean; Wen, et al. Expires August 23, 2018 [Page 124] Internet-Draft L2VPN Service Model February 2018 default "false"; description "LLDP. Indicate LLDP is supported."; } container oam-802.3ah-link { if-feature oam-3ah; leaf enable { type boolean; default "false"; description "Indicate whether support oam 802.3 ah link"; } description "Container for oam 802.3 ah link."; } leaf uni-loop-prevention { type boolean; default "false"; description "If this leaf set to truth that the port automatically goes down when a physical loopback is detect."; } description "Container of Untagged Interface Attributes configurations."; } description "Grouping for Untagged interface."; } grouping lag-interface-grouping { container lag-interfaces { if-feature lag-interface; list lag-interface { key "index"; leaf index { type string; description "LAG interface index."; } uses lacp; description "List of LAG interfaces."; } description "Container of LAG interface attributes configuration"; } description Wen, et al. Expires August 23, 2018 [Page 125] Internet-Draft L2VPN Service Model February 2018 "Grouping for LAG interface"; } grouping tagged-interface-grouping { container tagged-interface { leaf type { type identityref { base tagged-inf-type; } default "priority-tagged"; description "Tagged interface type. By default, the Tagged interface type is priority tagged interface. "; } container dot1q-vlan-tagged { when "derived-from-or-self(../type, 'l2vpn-svc:dot1q')" { description "Only applies when Tagged interface type is dot1q."; } if-feature dot1q; leaf tg-type { type identityref { base tag-type; } default "c-vlan"; description "TAG type.By default, Tag type is Customer-VLAN tag."; } leaf cvlan-id { type uint16; mandatory true; description "VLAN identifier."; } description "Tagged interface."; } container priority-tagged { when "derived-from-or-self(../type, "+ "'l2vpn-svc:priority-tagged')" { description "Only applies when Tagged interface type is priority tagged interface."; } leaf tag-type { type identityref { base tag-type; Wen, et al. Expires August 23, 2018 [Page 126] Internet-Draft L2VPN Service Model February 2018 } default "c-vlan"; description "TAG type.By default, the TAG type is Customer-VLAN tag."; } description "Priority tagged."; } container qinq { when "derived-from-or-self(../type, 'l2vpn-svc:qinq')" { description "Only applies when Tagged interface type is qinq."; } if-feature qinq; leaf tag-type { type identityref { base tag-type; } default "c-s-vlan"; description "Tag type. By default, the Tag type is c-s-vlan."; } leaf svlan-id { type uint16; mandatory true; description "S-VLAN Identifier."; } leaf cvlan-id { type uint16; mandatory true; description "C-VLAN Identifier"; } description "QinQ."; } container qinany { when "derived-from-or-self(../type, 'l2vpn-svc:qinany')" { description "Only applies when Tagged interface type is qinany."; } if-feature qinany; leaf tag-type { type identityref { base tag-type; } Wen, et al. Expires August 23, 2018 [Page 127] Internet-Draft L2VPN Service Model February 2018 default "s-vlan"; description "Tag type.By default, the Tag type is Service-VLAN tag."; } leaf svlan-id { type uint16; mandatory true; description "S-Vlan ID."; } description "Container for Qin Any."; } container vxlan { when "derived-from-or-self(../type, 'l2vpn-svc:vxlan')" { description "Only applies when Tagged interface type is vxlan."; } if-feature vxlan; leaf vni-id { type uint32; mandatory true; description "VNI Identifier."; } leaf peer-mode { type identityref { base vxlan-peer-mode; } default "static-mode"; description "specify the vxlan access mode. By default the peer mode is Set as static mode."; } list peer-list { key "peer-ip"; leaf peer-ip { type inet:ip-address; description "Peer IP."; } description "List for peer IP."; } description "QinQ."; } description Wen, et al. Expires August 23, 2018 [Page 128] Internet-Draft L2VPN Service Model February 2018 "Container for tagged Interface."; } description "Grouping for tagged interface."; } grouping site-attachment-ethernet-connection { container connection { leaf encapsulation-type { type identityref { base encapsulation-type; } default "ethernet"; description "Encapsulation Type. By default,the encapsulation type is set as Ethernet."; } leaf eth-inf-type { type identityref { base eth-inf-type; } default "untagged"; description "Ethernet Interface Type. By default, the Ethernet Interface Type is set as untagged interface."; } uses tagged-interface-grouping; uses untagged-interface-grouping; uses lag-interface-grouping; uses cvlan-svc-map-grouping; uses l2cp-grouping; uses ethernet-svc-oam-grouping; description "Container for bearer"; } description "Grouping for bearer."; } grouping svc-mtu { leaf svc-mtu { type uint16; units "bytes"; mandatory true; description "SVC MTU, it is also known as the maximum transmission unit or maximum frame size,When a frame is larger than the MTU, it is Wen, et al. Expires August 23, 2018 [Page 129] Internet-Draft L2VPN Service Model February 2018 broken down, or fragmented, into smaller pieces by the network protocol to accommodate the MTU of the network. If CsC is enabled,the requested svc-mtu leaf will refer to the MPLS MTU and not to the link MTU. "; } description "Grouping for service mtu."; } grouping svc-preservation-grouping { leaf ce-vlan-preservation { type boolean; mandatory true; description "Preserve the CE-VLAN ID from ingress to egress,i.e., CE-VLAN tag of the egress frame are identical to those of the ingress frame that yielded this egress service frame. If All-to-One bundling within a site is Enabled, then preservation applies to all Ingress service frames. If All-to-One bundling is Disabled , then preservation applies to tagged Ingress service frames having CE-VLAN ID 1 through 4094."; } leaf ce-vlan-cos-perservation { type boolean; mandatory true; description "CE vlan CoS preservation. PCP bits in the CE-VLAN tag of the egress frame are identical to those of the ingress frame that yielded this egress service frame."; } description "Grouping for service preservation."; } grouping site-mac-addr-limit { container mac-addr-limit { if-feature mac-addr-limit; leaf limit-number { type uint16; default "2"; description "maximum number of MAC addresses learned from the subscriber for a single service instance. The default allowed maximum number of MAC addresses is 2."; Wen, et al. Expires August 23, 2018 [Page 130] Internet-Draft L2VPN Service Model February 2018 } leaf time-interval { type uint32; units "sec"; default "300"; description "The aging time of the mac address. By default, the aging time is set 300 seconds."; } leaf action { type identityref { base mac-action; } default "warning"; description "specify the action when the upper limit is exceeded: drop the packet, flood the packet, or simply send a warning log message. By default, action is set to warning."; } description "Container of MAC-Addr limit configurations"; } description "Grouping for mac address limit"; } grouping site-attachment-availability { container availability { leaf access-priority { type uint32; default "100"; description "Access priority. The higher the access-priority value, the higher the preference of the access will be."; } choice redundancy-mode { case single-active { leaf single-active { type empty; description "Single active."; } description "Single active case."; } case all-active { leaf all-active { Wen, et al. Expires August 23, 2018 [Page 131] Internet-Draft L2VPN Service Model February 2018 type empty; description "All active."; } description "All active case."; } description "Redundancy mode choice."; } description "Container of availability optional configurations."; } description "Grouping for availability."; } grouping l2cp-grouping { container l2cp-control { if-feature l2cp-control; leaf stp-rstp-mstp { type control-mode; description "STP/RSTP/MSTP protocol type applicable to all Sites."; } leaf pause { type control-mode; description "Pause protocol type applicable to all Sites."; } leaf lacp-lamp { type control-mode; description "LACP/LAMP."; } leaf link-oam { type control-mode; description "Link OAM."; } leaf esmc { type control-mode; description "ESMC."; } leaf l2cp-802.1x { type control-mode; description Wen, et al. Expires August 23, 2018 [Page 132] Internet-Draft L2VPN Service Model February 2018 "IEEE 802.x."; } leaf e-lmi { type control-mode; description "E-LMI."; } leaf lldp { type boolean; description "LLDP protocol type applicable to all sites."; } leaf ptp-peer-delay { type control-mode; description "PTP peer delay."; } leaf garp-mrp { type control-mode; description "GARP/MRP."; } description "Container of L2CP control configurations"; } description "Grouping for l2cp control."; } grouping site-bum { container broadcast-unknown-unicast-multicast { if-feature bum; leaf multicast-site-type { type enumeration { enum "receiver-only" { description "The site only has receivers."; } enum "source-only" { description "The site only has sources."; } enum "source-receiver" { description "The site has both sources and receivers."; } } default "source-receiver"; Wen, et al. Expires August 23, 2018 [Page 133] Internet-Draft L2VPN Service Model February 2018 description "Type of multicast site."; } list multicast-gp-address-mapping { key "id"; leaf id { type uint16; description "Unique identifier for the mapping."; } leaf vlan-id { type uint16 { range "0..1024"; } mandatory true; description "The VLAN ID of the Multicast group. The range of 12 bit VLAN ID is 0 to 1024."; } leaf mac-gp-address { type yang:mac-address; mandatory true; description "the MAC address of the Multicast group."; } leaf port-lag-number { type uint32; description "the ports/LAGs belonging to the Multicast group."; } description "List of Port to group mappings."; } leaf bum-overall-rate { type uint32; units "bps"; description "overall rate for BUM."; } list bum-rate-per-type { key "type"; leaf type { type identityref { base bum-type; } description "BUM type."; } Wen, et al. Expires August 23, 2018 [Page 134] Internet-Draft L2VPN Service Model February 2018 leaf rate { type uint32; units "bps"; description "rate for BUM."; } description "List of rate per type."; } description "Container of broadcast, unknown unicast, and multicast configurations."; } description "Grouping for broadcast, unknown unicast, and multicast."; } grouping site-mac-loop-prevention { container mac-loop-prevention { if-feature mac-loop-prevention; leaf protection-type { type identityref { base loop-prevention-type; } default "trap"; description "Protection type. By default, the protection type is trap protection type."; } leaf frequency { type uint32; default "5"; description "The number of times to detect MAC duplication. When duplicate-MAC situation has occurred and the duplicated MAC is added into to a duplicate-MAC list. By default, the number of times is 5."; } leaf retry-timer { type uint32; units "seconds"; description "The retry timer. When retry timer expires, the duplicated MAC will be flushed from the MAC-VRF. "; } description "Container of MAC loop prevention."; Wen, et al. Expires August 23, 2018 [Page 135] Internet-Draft L2VPN Service Model February 2018 } description "Grouping for MAC loop prevention."; } grouping ethernet-svc-oam-grouping { container oam { if-feature ethernet-oam; leaf md-name { type string; mandatory true; description "Maintenance domain name."; } leaf md-level { type uint16 { range "0..255"; } mandatory true; description "Maintenance domain level. The level may be restricted in certain protocols (e.g., protocol in layer 0 to layer 7)."; } uses cfm-8021-ag; uses y-1731; description "Container for Ethernet service OAM."; } description "Grouping for Ethernet service OAM."; } grouping site-group { container groups { list group { key "group-id"; leaf group-id { type string; description "Group-id the site is belonging to."; } description "List of group-id"; } description "Groups the site or site-network-access is belonging to."; Wen, et al. Expires August 23, 2018 [Page 136] Internet-Draft L2VPN Service Model February 2018 } description "Grouping definition to assign group-ids to site or site-network-access."; } grouping access-diversity { container access-diversity { if-feature site-diversity; uses site-group; container constraints { list constraint { key "constraint-type"; leaf constraint-type { type identityref { base placement-diversity; } description "Diversity constraint type."; } container target { choice target-flavor { default "id"; case id { list group { key "group-id"; leaf group-id { type string; description "The constraint will apply against this particular group-id."; } description "List of groups."; } } case all-accesses { leaf all-other-accesses { type empty; description "The constraint will apply against all other site network access of this site."; } } case all-groups { leaf all-other-groups { Wen, et al. Expires August 23, 2018 [Page 137] Internet-Draft L2VPN Service Model February 2018 type empty; description "The constraint will apply against all other groups the customer is managing."; } } description "Choice for the group definition."; } description "The constraint will apply against this list of groups."; } description "List of constraints."; } description "Constraints for placing this site network access."; } description "Diversity parameters."; } description "This grouping defines access diversity parameters"; } grouping site-attachment-bearer { container bearer { container requested-type { if-feature requested-type; leaf type { type string; description "Type of requested bearer Ethernet, ATM, Frame Relay, IP Layer 2 Transport, Frame Relay DLCI, SONET/SDH,PPP."; } leaf strict { type boolean; default "false"; description "Define if the requested-type is a preference or a strict requirement."; } description Wen, et al. Expires August 23, 2018 [Page 138] Internet-Draft L2VPN Service Model February 2018 "Container for requested type."; } leaf always-on { if-feature always-on; type boolean; default "true"; description "Request for an always on access type. For example.This could mean no Dial access type."; } leaf bearer-reference { if-feature bearer-reference; type string; description "This is an internal reference for the service provider."; } description "Bearer specific parameters. To be augmented."; } description "Grouping to define physical properties of a site attachment."; } grouping site-vpn-attachment { container vpn-attachment { choice attachment-flavor { case vpn-id { leaf vpn-id { type leafref { path "/l2vpn-svc/vpn-services/vpn-service/vpn-id"; } description "Reference to a L2VPN. Referencing a vpn-id provides an easy way to attach a particular logical access to a VPN. In this case, vpn-id must be configured."; } leaf site-role { type identityref { base site-role; } default "any-to-any-role"; description "Role of the site in the L2VPN. When referencing a vpn-id, the site-role setting must be added to express the role of the site in the target VPN service topology."; Wen, et al. Expires August 23, 2018 [Page 139] Internet-Draft L2VPN Service Model February 2018 } } case vpn-policy-id { leaf vpn-policy-id { type leafref { path "../../../../vpn-policies/vpn-policy/vpn-policy-id"; } description "Reference to a vpn policy."; } } mandatory true; description "Choice for VPN attachment flavor."; } description "Defines VPN attachment of a site."; } description "Grouping for access attachment."; } grouping site-service-basic { container svc-bandwidth { if-feature input-bw; list bandwidth { key "direction type"; leaf direction { type identityref { base bw-direction; } description "Indicate the bandwidth direction. It can be bandwidth download direction from the SP to the site or bandwidth upload direction from the site to the SP."; } leaf type { type identityref { base bw-type; } description "Bandwidth Type. By default, the bandwidth type is set as bandwidth per cos."; } leaf cos-id { when "../type = 'bw-per-cos'" { description "Relevant when the bandwidth type is set as bandwidth Wen, et al. Expires August 23, 2018 [Page 140] Internet-Draft L2VPN Service Model February 2018 per cos."; } type uint8; description "Identifier of Class of Service , indicated by DSCP or a CE-CLAN CoS(802.1p)value in the service frame. If bandwidth type is set as bandwidth per cos, cos-id MUST be specified."; } leaf vpn-id { when "../type = 'bw-per-svc'" { description "Relevant when the bandwidth type is set as bandwidth per VPN service."; } type svc-id; description "Identifies the target VPN. If bandwidth type is set as bandwidth per VPN service, vpn-id MUST be specified."; } leaf cir { type uint64; units "bps"; mandatory true; description "Committed Information Rate. The maximum number of bits that a port can receive or send during one-second over an interface."; } leaf cbs { type uint64; units "bps"; mandatory true; description "Committed Burst Size.CBS controls the bursty nature of the traffic. Traffic that does not use the configured CIR accumulates credits until the credits reach the configured CBS."; } leaf eir { type uint64; units "bps"; description "Excess Information Rate,i.e.,Excess frame delivery allowed not subject to SLA.The traffic rate can be limited by eir."; Wen, et al. Expires August 23, 2018 [Page 141] Internet-Draft L2VPN Service Model February 2018 } leaf ebs { type uint64; units "bps"; description "Excess Burst Size. The bandwidth available for burst traffic from the EBS is subject to the amount of bandwidth that is accumulated during periods when traffic allocated by the EIR policy is not used."; } leaf pir { type uint64; units "bps"; description "Peak Information Rate, i.e., maixmum frame delivery allowed.It is equal to or less than sum of cir and eir."; } leaf pbs { type uint64; units "bps"; description "Peak Burst Size. It is measured in bytes per second."; } description "List for bandwidth."; } description "From the customer site's perspective, the service input/out bandwidth of the connection or download/upload bandwidth from the SP/site to the site/SP."; } uses svc-mtu; description "Define basic service parameters for the site."; } grouping flow-definition { container match-flow { leaf dscp { type inet:dscp; description "DSCP value."; } leaf dot1q { type uint16; description "802.1q matching. It is VLAN Tag added into frame."; Wen, et al. Expires August 23, 2018 [Page 142] Internet-Draft L2VPN Service Model February 2018 } leaf pcp { type uint8 { range "0 .. 7"; } description "PCP value."; } leaf src-mac { type yang:mac-address; description "Source MAC"; } leaf dst-mac { type yang:mac-address; description "Destination MAC."; } leaf color-type { type identityref { base color-type; } description "Color Types."; } leaf-list target-sites { if-feature target-sites; type svc-id; description "Identify a site as traffic destination."; } leaf any { type empty; description "Allow all."; } leaf vpn-id { type svc-id; description "Reference to the target VPN."; } description "Describe flow matching criteria."; } description "Flow definition based on criteria."; } Wen, et al. Expires August 23, 2018 [Page 143] Internet-Draft L2VPN Service Model February 2018 grouping site-service-qos-profile { container qos { if-feature qos; container classification-policy { list rule { key "id"; ordered-by user; leaf id { type string; description "A description identifying qos classification policy rule."; } choice match-type { default "match-flow"; case match-flow { uses flow-definition; } case match-application { leaf match-application { type identityref { base customer-application; } description "Defines the application to match."; } } description "Choice for classification"; } leaf target-class-id { type string; description "Identification of the class of service. This identifier is internal to the administration."; } description "List of marking rules."; } description "Configuration of the traffic classification policy."; } container qos-profile { choice qos-profile { description "Choice for QoS profile. Can be standard profile or customized profile."; Wen, et al. Expires August 23, 2018 [Page 144] Internet-Draft L2VPN Service Model February 2018 case standard { description "Standard QoS profile."; leaf profile { type leafref { path "/l2vpn-svc/vpn-profiles/"+ "valid-provider-identifiers"+ "/qos-profile-identifier/id"; } description "QoS Profile to be used."; } } case custom { description "Customized QoS profile."; container classes { if-feature qos-custom; list class { key "class-id"; leaf class-id { type string; description "Identification of the class of service. This identifier is internal to the administration."; } leaf direction { type identityref { base qos-profile-direction; } default "bidirectional"; description "The direction which QoS profile is applied to. By default,the direction is bidirectional."; } leaf policing { type identityref { base policing; } default "one-rate-two-color"; description "The policing can be either one-rate, two-color (1R2C) or two-rate, three-color (2R3C). By default, the policing is on rate two color."; } leaf byte-offset { Wen, et al. Expires August 23, 2018 [Page 145] Internet-Draft L2VPN Service Model February 2018 type uint16; description "For not including extra VLAN tags in the QoS calculation."; } container frame-delay { choice flavor { case lowest { leaf use-lowest-latency { type empty; description "The traffic class should use the lowest delay path."; } } case boundary { leaf delay-bound { type uint16; units "msec"; description "The traffic class should use a path with a defined maximum delay."; } } description "Delay constraint on the traffic class."; } description "Delay constraint on the traffic class."; } container frame-jitter { choice flavor { case lowest { leaf use-lowest-jitter { type empty; description "The traffic class should use the lowest jitter path."; } } case boundary { leaf delay-bound { type uint32; units "usec"; description Wen, et al. Expires August 23, 2018 [Page 146] Internet-Draft L2VPN Service Model February 2018 "The traffic class should use a path with a defined maximum jitter."; } } description "Jitter constraint on the traffic class."; } description "Jitter constraint on the traffic class."; } container frame-loss { leaf rate { type decimal64 { fraction-digits 2; range "0..100"; } units "percent"; description "Frame Loss rate constraint on the traffic class."; } description "Container for frame loss rate."; } container bandwidth { leaf guaranteed-bw-percent { type decimal64 { fraction-digits 5; range "0..100"; } units "percent"; mandatory true; description "To be used to define the guaranteed bandwidth as a percentage of the available service bandwidth."; } leaf end-to-end { type empty; description "Used if the bandwidth reservation must be done on the MPLS network too."; } description "Bandwidth constraint on the traffic class."; Wen, et al. Expires August 23, 2018 [Page 147] Internet-Draft L2VPN Service Model February 2018 } description "List of class of services."; } description "Container for list of class of services."; } } } description "Qos profile configuration."; } description "QoS configuration."; } description "This grouping defines QoS parameters for a site"; } grouping site-service { container service { uses site-service-qos-profile; uses site-service-mpls; description "Service parameters on the attachment."; } description "Grouping for Service parameters."; } grouping site-service-mpls { container carrierscarrier { if-feature carrierscarrier; leaf signaling-type { type identityref { base carrierscarrier-type; } default "bgp"; description "Carrierscarrier. By default,the signaling type is bgp."; } description "Container for carrierscarrier"; } description "Grouping for carrierscarrier"; } Wen, et al. Expires August 23, 2018 [Page 148] Internet-Draft L2VPN Service Model February 2018 grouping site-network-access-service { container service { uses site-service-basic; uses site-service-qos-profile; uses site-service-mpls; description "Container for service"; } description "Grouping for service."; } grouping vpn-profile-cfg { container valid-provider-identifiers { list cloud-identifier { if-feature cloud-access; key "id"; leaf id { type string; description "Identification of cloud service. Local administration meaning."; } description "List for Cloud Identifiers."; } list qos-profile-identifier { key "id"; leaf id { type string; description "Identification of the QoS Profile to be used. Local administration meaning."; } description "List for QoS Profile Identifiers."; } list bfd-profile-identifier { key "id"; leaf id { type string; description "Identification of the SP BFD Profile to be used. Local administration meaning."; } description "List for BFD Profile identifiers."; } Wen, et al. Expires August 23, 2018 [Page 149] Internet-Draft L2VPN Service Model February 2018 list remote-carrier-identifier { key "id"; leaf id { type string; description "Identification of the remote carrier name to be used. Local administration meaning."; } description "List for remote carrier identifiers."; } nacm:default-deny-write; description "Container for Valid Provider Identifies."; } description "Grouping for VPN Profile configuration."; } grouping site-network-access-top-level-cfg { leaf type { type identityref { base site-network-access-type; } default "point-to-point"; description "Describes the type of connection, e.g., point-to-point or multipoint."; } choice location-flavor { case location { when "derived-from-or-self(../../management/type, "+ "'l2vpn-svc:customer-managed')" { description "Applicable only for customer-managed device."; } leaf location-reference { type leafref { path "../../../locations/location/location-id"; } description "Location of the site-network-access."; } } case device { when "derived-from-or-self(../../management/type, "+ "'l2vpn-svc:provider-managed') or "+ "derived-from-or-self(../../management/type, "+ Wen, et al. Expires August 23, 2018 [Page 150] Internet-Draft L2VPN Service Model February 2018 "'l2vpn-svc:co-managed')" { description "Applicable only for provider-managed or co-managed device."; } leaf device-reference { type leafref { path "../../../devices/device/device-id"; } description "Identifier of CE to use."; } } mandatory true; description "Choice of how to describe the site's location."; } uses access-diversity; uses site-attachment-bearer; uses site-attachment-ethernet-connection; uses site-attachment-availability; uses site-vpn-attachment; uses site-network-access-service; uses site-bum; uses site-mac-loop-prevention; uses site-acl; uses site-mac-addr-limit; description "Grouping for site network access top-level configuration."; } container l2vpn-svc { container vpn-profiles { uses vpn-profile-cfg; description "Container for VPN Profiles."; } container vpn-services { list vpn-service { key "vpn-id"; leaf vpn-id { type svc-id; description "Defining a service id."; } leaf svc-type { type identityref { Wen, et al. Expires August 23, 2018 [Page 151] Internet-Draft L2VPN Service Model February 2018 base service-type; } default "vpws"; description "Service type. By default, the service type is VPWS."; } leaf customer-name { type string; description "Customer name."; } leaf svc-topo { type identityref { base vpn-topology; } default "any-to-any"; description "Defining service topology, such as any-to-any,hub-spoke, etc."; } uses vpn-service-cloud-access; uses vpn-service-multicast; uses vpn-extranet; uses svc-preservation-grouping; leaf carrierscarrier { if-feature carrierscarrier; type boolean; default "false"; description "The VPN is using CsC, and so MPLS is required."; } description "List of vpn services."; } description "Container for VPN services."; } container sites { list site { key "site-id"; leaf site-id { type string; description "Identifier of the site."; } uses site-vpn-flavor; uses site-device; Wen, et al. Expires August 23, 2018 [Page 152] Internet-Draft L2VPN Service Model February 2018 uses customer-location-info; uses site-management; uses site-diversity; uses site-vpn-policy; uses site-service; uses site-bum; uses site-mac-loop-prevention; uses site-acl; uses operational-requirements-ops; container site-network-accesses { list site-network-access { key "network-access-id"; leaf network-access-id { type string; description "Identifier of network access"; } leaf remote-carrier-name { when "derived-from-or-self(../../../site-vpn-flavor,"+ "'l2vpn-svc:site-vpn-flavor-nni')" { description "Relevant when Site vpn flavor is site-vpn-flavor-nni."; } type leafref { path "/l2vpn-svc/vpn-profiles/"+ "valid-provider-identifiers"+ "/remote-carrier-identifier/id"; } description "Remote carrier name. The remote-carrier-name must be configured only when site-vpn-flavor is set to site vpn-flavor-nni. If it is not set,it indicates customer does not know remote carrier name beforehand."; } uses site-network-access-top-level-cfg; description "List of Site Network Accesses."; } description "Container of port configurations."; } description "List of sites."; } description "Container of site configurations."; Wen, et al. Expires August 23, 2018 [Page 153] Internet-Draft L2VPN Service Model February 2018 } description "Container for L2VPN service."; } } 9. Security Considerations The YANG modules defined in this document MAY be accessed via the RESTCONF protocol [RFC8040] or NETCONF protocol ([RFC6241]). The lowest RESTCONF or NETCONF layer requires that the transport-layer protocol provides both data integrity and confidentiality, see Section 2 in [RFC8040] and [RFC6241]. The lowest NETCONF layer is the secure transport layer, and the mandatory-to-implement secure transport is Secure Shell (SSH)[RFC6242] . The lowest RESTCONF layer is HTTPS, and the mandatory-to-implement secure transport is TLS [RFC5246]. The NETCONF access control model [RFC6536] provides the means to restrict access for particular NETCONF or RESTCONF users to a preconfigured subset of all available NETCONF or RESTCONF protocol operations and content. There are a number of data nodes defined in this YANG module that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability: o /l2vpn-svc/vpn-services/vpn-service The entries in the list above include the whole vpn service configurations which the customer subscribes, and indirectly create or modify the PE and CE device configurations. Unexpected changes to these entries could lead to the service disruption and/ or network misbehavior. o /l2vpn-svc/sites/site The entries in the list above include the customer site configurations. As above, unexpected changes to these entries could lead to the service disruption and/or network misbehavior. Some of the readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus Wen, et al. Expires August 23, 2018 [Page 154] Internet-Draft L2VPN Service Model February 2018 important to control read access (e.g., via get, get-config, or notification) to these data nodes. These are the subtrees and data nodes and their sensitivity/vulnerability: o /l2vpn-svc/vpn-services/vpn-service o /l2vpn-svc/sites/site The entries in the lists above include customer-proprietary or confidential information, e.g., customer-name, site location, what service the customer subscribes. The data model defines some security parameters that can be extended via augmentation as part of the customer service request; those parameters are described in Section 5.12 and Section 5.13. 10. Acknowledgements Thanks to Qin Wu and Adrian Farrel for facilitating work on the initial revisions of this document. Thanks to Zonghe Huang, Wei Deng and Xiaoling Song to help review this draft. Special thanks to Jan Lindblat for his careful review of the YANG. This document has drawn on the work of the L3SM Working Group expressed in [RFC8299]. 11. IANA Considerations IANA is requested to assign a new URI from the IETF XML registry ([RFC3688]). The following URI is suggested: URI: urn:ietf:params:xml:ns:yang:ietf-l2vpn-svc Registrant Contact: L2SM WG XML: N/A, the requested URI is an XML namespace This document also requests a new YANG module name in the YANG Module Names registry ([RFC6020]) with the following suggestion: name: ietf-l2vpn-svc namespace: urn:ietf:params:xml:ns:yang:ietf-l2vpn-svc prefix: l2vpn-svc reference: RFC XXXX Wen, et al. Expires August 23, 2018 [Page 155] Internet-Draft L2VPN Service Model February 2018 12. References 12.1. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC4364] Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February 2006, . [RFC4761] Kompella, K., Ed. and Y. Rekhter, Ed., "Virtual Private LAN Service (VPLS) Using BGP for Auto-Discovery and Signaling", RFC 4761, DOI 10.17487/RFC4761, January 2007, . [RFC5246] Dierks, T. and E. Rescorla, "The Transport Layer Security (TLS) Protocol Version 1.2", RFC 5246, DOI 10.17487/RFC5246, August 2008, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [RFC6073] Martini, L., Metz, C., Nadeau, T., Bocci, M., and M. Aissaoui, "Segmented Pseudowire", RFC 6073, DOI 10.17487/RFC6073, January 2011, . [RFC6074] Rosen, E., Davie, B., Radoaca, V., and W. Luo, "Provisioning, Auto-Discovery, and Signaling in Layer 2 Virtual Private Networks (L2VPNs)", RFC 6074, DOI 10.17487/RFC6074, January 2011, . [RFC6241] Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, June 2011, . Wen, et al. Expires August 23, 2018 [Page 156] Internet-Draft L2VPN Service Model February 2018 [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC6536] Bierman, A. and M. Bjorklund, "Network Configuration Protocol (NETCONF) Access Control Model", RFC 6536, DOI 10.17487/RFC6536, March 2012, . [RFC7432] Sajassi, A., Ed., Aggarwal, R., Bitar, N., Isaac, A., Uttaro, J., Drake, J., and W. Henderickx, "BGP MPLS-Based Ethernet VPN", RFC 7432, DOI 10.17487/RFC7432, February 2015, . [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8214] Boutros, S., Sajassi, A., Salam, S., Drake, J., and J. Rabadan, "Virtual Private Wire Service Support in Ethernet VPN", RFC 8214, DOI 10.17487/RFC8214, August 2017, . 12.2. Informative References [I-D.ietf-bess-evpn-yang] Brissette, P., Sajassi, A., Shah, H., Li, Z., Tiruveedhula, K., Hussain, I., and J. Rabadan, "Yang Data Model for EVPN", draft-ietf-bess-evpn-yang-03 (work in progress), October 2017. [I-D.ietf-bess-l2vpn-yang] Shah, H., Brissette, P., Chen, I., Hussain, I., Wen, B., and K. Tiruveedhula, "YANG Data Model for MPLS-based L2VPN", draft-ietf-bess-l2vpn-yang-08 (work in progress), February 2018. [IEEE-802-1ag] IEEE, "802.1ag - Connectivity Fault Management", December 2007. [IEEE-802-1D] IEEE, "802.1D-2004 - MAC Bridges", June 2004. Wen, et al. Expires August 23, 2018 [Page 157] Internet-Draft L2VPN Service Model February 2018 [ITU-T-Y-1731] ITU-T, "Recommendation Y.1731 - OAM functions and mechanisms for Ethernet based networks", February 2008. [RFC4664] Andersson, L., Ed. and E. Rosen, Ed., "Framework for Layer 2 Virtual Private Networks (L2VPNs)", RFC 4664, DOI 10.17487/RFC4664, September 2006, . [RFC6624] Kompella, K., Kothari, B., and R. Cherukuri, "Layer 2 Virtual Private Networks Using BGP for Auto-Discovery and Signaling", RFC 6624, DOI 10.17487/RFC6624, May 2012, . [RFC7209] Sajassi, A., Aggarwal, R., Uttaro, J., Bitar, N., Henderickx, W., and A. Isaac, "Requirements for Ethernet VPN (EVPN)", RFC 7209, DOI 10.17487/RFC7209, May 2014, . [RFC7348] Mahalingam, M., Dutt, D., Duda, K., Agarwal, P., Kreeger, L., Sridhar, T., Bursell, M., and C. Wright, "Virtual eXtensible Local Area Network (VXLAN): A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks", RFC 7348, DOI 10.17487/RFC7348, August 2014, . [RFC8199] Bogdanovic, D., Claise, B., and C. Moberg, "YANG Module Classification", RFC 8199, DOI 10.17487/RFC8199, July 2017, . [RFC8299] Wu, Q., Ed., Litkowski, S., Tomotaki, L., and K. Ogaki, "YANG Data Model for L3VPN Service Delivery", RFC 8299, DOI 10.17487/RFC8299, January 2018, . [RFC8309] Wu, Q., Liu, W., and A. Farrel, "Service Models Explained", RFC 8309, DOI 10.17487/RFC8309, January 2018, . Appendix A. Changes Log Changes in v-(01) include: o Reference Update. o Fix figure in section 3.3 and section 3.4 Wen, et al. Expires August 23, 2018 [Page 158] Internet-Draft L2VPN Service Model February 2018 o Consider VPWS, VPLS, EVPN as basic service and view EVC related service as additional service. o Model structure change, move two customer information related parameter into VPN Services container, remove 'customer-info 'container o Redefine vpn-type to cover VPWS, VPLS, EVPN service; o Consolidate EVC and OVC container, make them optional since for some L2VPN service such as EVPN sevice, OVC, EVC are not needed. o Add service and security filter under sites container and change "ports" into "site-network-accesses" to get consistent with L3SM and also make it generalized. o Fixed usage examples in the l2sm model draft. Changes in v-(02) include: o Fix figure 3 and figure 4 in section 3.4 to apply IEEE802.3 on the segment between C and CE and apply IEEE802.1Q on the segment between CE and PE. o Update Signaling Option section and add L2TP support and classify the signaling option type into BGP-L2VPN, BGP-EVPN, LDP-PWE, L2TP- PW. o Add Multicast Support in section 5.2.13, section 5.10.3 and move the text in BUM Storm Control section into section 5.10.3. o Add new section 5.3.1, section 5.4, section 5.5, section 5.6, section 5.7, section 5.8, section 5.11to explain the usage of constraint parameters and service placement related parameters. o Add new section 5.1 and 5.14 to allow augmentation and external ID References. o Add new section to discuss inter-AS support and inter-provider support with NNI and EVC, OVC. o Update Service Section 5.10 and define four type for svc-input- bandwidth and svc-output-bandwidth and add guaranteed-bw-percent parameter and related description. o Add extranet VPN support. o Remove duplicated parameters from cloud access. Wen, et al. Expires August 23, 2018 [Page 159] Internet-Draft L2VPN Service Model February 2018 o Move L2CP control plane protocol parameters under connection. o Update section 5.3.3.2 to address loop avoidance issue and divide section 5.3.3.2 into Physical interface section, LAG interface section and Addressing Section. o Reference Update. Changes in v-(03) include: o Introduce additional terminology. o Modify figure 5 to get consistent with RFC8049. o Add end to end Multi-segment connectivity support and site-vpn- flavor-e2e attribute. o Add usage example to explain how to use EVC and OVC. o Discuss applicability of this model to inter-provider support. o Reduce redundant parameters related to encapsulation type and Ethernet type in the model. o Clarify the relationship between guarantee-bandwidth-percent and CIR, EIR and PIR. o Modify model structure for VPN service to make it consistent with the text in section 5. o Remove Sub-inf parameter since it is similar to QinQ parameter. o Add "direction" parameter for QoS profile. o Update XML example and figure in section 5.16. Changes in v-(04) include: o Remove EVC and OVC related attributes. o Remove Metro-Network related attributes. o Remove Customer Account Number attributes. o Update L2VPN service Types. o Remove load banlancing options since access-priority within availability can be used to support load balancing. Wen, et al. Expires August 23, 2018 [Page 160] Internet-Draft L2VPN Service Model February 2018 o Remove service protection attribute since we have site diversity attributes. o Move SVC-MTU to service level. o Move CVLAN to Service Mapping to Network Access Level. o Add two new parameters under qos-classification-policy. o Remove Security Container. o Remove IPv4/IPv6 prefix filter from VPN policy. o Add Delivery mode support at service level. Changes in v-(05) include: o Change type from 16-bit integer to string for the leaf id under "qos-classification-policy" container. o Stick to using ordered-by user and remove inefficiency to map service model sequence number to device model sequence number. o Remove mandating the use of deviations and add "if-feature target- sites" under the leaf-list target-sites in section 5.10.2. o RFC2119 language changes on operation of the management system in Section 5.6,3rd paragraph and section 7. o Fix incomplete description statements. o Change the use of the absolute paths to the use of relative paths in the "must" statement or "path" statement for vpn-policy-id leaf node, management container, location leaf node, devices container, location case, location-reference leaf, device case, device- reference leaf to make configuration is only applicable to the current sites. o Change "must" statement to "when" statement for management container device container. o Define new grouping vpn-profile-cfg for all the identifiers provided by SP to the customer. The identifiers include cloud- identifier, std-qos-profile. o Add in the XPATH string representation and remove unqualified name. Wen, et al. Expires August 23, 2018 [Page 161] Internet-Draft L2VPN Service Model February 2018 o Remove redundant parameters in the cloud access. o Add a few text to clarify what the site is in section 6.3. o Add multi-filter and multi-VPN per entry support for VPN policy. o Modify description for svc-bandwidth leaf to make it consistent with the text in section 5.10.1. o Add text to clarify the way to achieve Per-VPN QoS policy. o Change guaranteed-bw-percent data type from uint8 to decimal64. Authors' Addresses Bin Wen Comcast Email: bin_wen@comcast.com Giuseppe Fioccola (editor) Telecom Italia Email: giuseppe.fioccola@telecomitalia.it Chongfeng Xie China Telecom Email: xiechf@ctbri.com.cn Luay Jalil Verizon Email: luay.jalil@verizon.com Wen, et al. Expires August 23, 2018 [Page 162]