Operations and Management Area Working Group M. Boucadair, Ed. Internet-Draft Orange Intended status: Standards Track R. Roberts Expires: 2 June 2024 Juniper O. G. D. Dios Telefonica S. B. Giraldo Nokia B. Wu Huawei Technologies 30 November 2023 A Network YANG Data Model for Attachment Circuits draft-ietf-opsawg-ntw-attachment-circuit-03 Abstract This document specifies a network model for attachment circuits. The model can be used for the provisioning of attachment circuits prior or during service provisioning (e.g., Network Slice Service). A companion service model is specified in I-D.ietf-opsawg-teas- attachment-circuit. The module augments the Service Attachment Point (SAP) model with the detailed information for the provisioning of attachment circuits in Provider Edges (PEs). Discussion Venues This note is to be removed before publishing as an RFC. Discussion of this document takes place on the Operations and Management Area Working Group Working Group mailing list (opsawg@ietf.org), which is archived at https://mailarchive.ietf.org/arch/browse/opsawg/. Source for this draft and an issue tracker can be found at https://github.com/boucadair/attachment-circuit-model. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Boucadair, et al. Expires 2 June 2024 [Page 1] Internet-Draft A YANG Network Model for ACs November 2023 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." This Internet-Draft will expire on 2 June 2024. Copyright Notice Copyright (c) 2023 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 Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Conventions and Definitions . . . . . . . . . . . . . . . . . 4 3. Sample Uses of the Attachment Circuit Data Models . . . . . . 6 4. Description of the Attachment Circuit YANG Module . . . . . . 7 4.1. Overall Structure of the Module . . . . . . . . . . . . . 8 4.2. Provisioning Profiles . . . . . . . . . . . . . . . . . . 10 4.3. L2 Connection . . . . . . . . . . . . . . . . . . . . . . 11 4.4. IP Connection . . . . . . . . . . . . . . . . . . . . . . 13 4.5. Routing . . . . . . . . . . . . . . . . . . . . . . . . . 16 4.5.1. Static Routing . . . . . . . . . . . . . . . . . . . 18 4.5.2. BGP . . . . . . . . . . . . . . . . . . . . . . . . . 20 4.5.3. OSPF . . . . . . . . . . . . . . . . . . . . . . . . 27 4.5.4. IS-IS . . . . . . . . . . . . . . . . . . . . . . . . 29 4.5.5. RIP . . . . . . . . . . . . . . . . . . . . . . . . . 31 4.5.6. VRRP . . . . . . . . . . . . . . . . . . . . . . . . 34 4.6. OAM . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 4.7. Security . . . . . . . . . . . . . . . . . . . . . . . . 38 4.8. Service . . . . . . . . . . . . . . . . . . . . . . . . . 39 5. YANG Module . . . . . . . . . . . . . . . . . . . . . . . . . 42 6. Security Considerations . . . . . . . . . . . . . . . . . . . 81 Boucadair, et al. Expires 2 June 2024 [Page 2] Internet-Draft A YANG Network Model for ACs November 2023 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 83 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 83 8.1. Normative References . . . . . . . . . . . . . . . . . . 83 8.2. Informative References . . . . . . . . . . . . . . . . . 87 Appendix A. Examples . . . . . . . . . . . . . . . . . . . . . . 88 A.1. VPLS . . . . . . . . . . . . . . . . . . . . . . . . . . 88 A.2. Parent AC . . . . . . . . . . . . . . . . . . . . . . . . 92 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 93 Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 94 1. Introduction Connectivity services are provided by networks to customers via dedicated terminating points, such as Service Functions [RFC7665], customer edges (CEs), peer Autonomous System Border Routers (ASBRs), data centers gateways, or Internet Exchange Points. The procedure to provision a service in a service provider network may depend on the practices adopted by a service provider, including the flow put in place for the provisioning of advanced network services and how they are bound to an Attachment Circuit (AC). For example, the same attachment circuit may host multiple services (e.g., Layer 2 Virtual Private Network (VPN), Slice Service, or Layer 3 VPN). In order to avoid service interference and redundant information in various locations, a service provider may expose an interface to manage ACs network-wide. Customers can then request a standalone attachment circuit to be put in place, and then refer to that attachment circuit when requesting services to be bound to that AC. [I-D.ietf-opsawg-teas-attachment-circuit] specifies a data model for managing attachment circuits as a service. Section 5 specifies a network model for attachment circuits ("ietf- ac-ntw"). The model can be used for the provisioning of ACs prior or during service provisioning. The document leverages [RFC9182] and [RFC9291] by adopting an AC provisioning structure that uses data nodes that are defined in these RFCs. Some refinements were introduced to cover, not only conventional service provider networks, but also specifics of other target deployments (cloud, for example). The AC network model is designed as an augmnetation to the Service Attachment Point (SAP) model [RFC9408]. An attachment circuit can be bound to a single or multiple SAPs. Likewise, the model is designed to accomdate deployments where a SAP can be bound to one or multiple ACs (e.g., a parent AC and its child ACs). Boucadair, et al. Expires 2 June 2024 [Page 3] Internet-Draft A YANG Network Model for ACs November 2023 .---. |CE6| '-+-' ac | .---. .---. | |CE5+------+------+CE2| .------+-----. '---' | '---' | | |ac | | | .-+-. .-+-. .-+-. .-+sap+-------+sap+-. .-+sap+-------------. | '---' '---' | | '---' | .---. .-+-. | | | |CE1+--+sap| PE1 | | PE2 | '---'ac'-+-' | | | '-------------------' '-------------------' .-------------------. .-------------------. | | | .-+-.ac.---. | PE3 | | PE4 |sap+--+CE5| | | | '---' '---' | .---. | | .---. .---. .---. | '-------------+sap+-' '-+sap+-+sap+-+sap+-' '-+-' '-+-' '-+-' '-+-' |ac | |ac |ac .-+-. | .-+-. | |CE3+-----ac-----' |CE4+---' '---' '---' Figure 1: Attachment Circuits Examples The AC network model uses the AC common model defined in [I-D.ietf-opsawg-teas-common-ac]. The YANG data model in this document conforms to the Network Management Datastore Architecture (NMDA) defined in [RFC8342]. Sample examples are provided in Appendix A. 2. Conventions and Definitions 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. The reader should be familiar with the terms defined in Section 2 of [RFC9408]. Boucadair, et al. Expires 2 June 2024 [Page 4] Internet-Draft A YANG Network Model for ACs November 2023 This document uses the term "network model" as defined in Section 2.1 of [RFC8969]. The meanings of the symbols in the YANG tree diagrams are defined in [RFC8340]. In addition, this document uses the following terms: Bearer: A physical or logical link that connects a customer node (or site) to a provider network. A bearer can be a wireless or wired link. One or multiple technologies can be used to build a bearer. The bearer type can be specified by a customer. The operator allocates a unique bearer reference to identify a bearer within its network (e.g., customer line identifier). Such a reference can be retrieved by a customer and then used in subsequent service placement requests to unambiguously identify where a service is to be bound. The concept of bearer can be generalized to refer to the required underlying connection for the provisioning of an attachment circuit. One or multiple attachment circuits may be hosted over the same bearer (e.g., multiple Virtual Local Area Networks (VLANs) on the same bearer that is provided by a physical link). Network controller: Denotes a functional entity responsible for the management of the service provider network. One or multiple network controllers can be deployed in a service provider network. Service orchestrator: Refers to a functional entity that interacts with the customer of a network service. A service orchestrator is typically responsible for the attachment circuits, the Provider Edge (PE) selection, and requesting the activation of the requested services to a network controller. A service orchestrator may interact with one or more network controllers. Service provider network: A network that is able to provide network services (e.g., L2VPN, L3VPN, or Network Slice Services). Service provider: A service provider that offers network services (e.g., L2VPN, L3VPN, or Network Slice Services). Boucadair, et al. Expires 2 June 2024 [Page 5] Internet-Draft A YANG Network Model for ACs November 2023 3. Sample Uses of the Attachment Circuit Data Models Figure 2 shows the positioning of the AC network model in the overall service delivery process. The "ietf-ac-ntw" is a network model which augments the SAP with a comprehensive set of parameters to reflect the attachment circuits that are in place in a network. The model also maintains the mapping with the service references that are used to expose these ACs to customers. Whether the same naming conventions to reference an AC are used in the service and network layers is deployment-specific. Boucadair, et al. Expires 2 June 2024 [Page 6] Internet-Draft A YANG Network Model for ACs November 2023 .---------------. | Customer | '-------+-------' Customer Service Model | e.g., slice-svc, ac-svc,| and bearer-svc .-------+-------. | Service | | Orchestration | '-------+-------' Network Model | e.g., l3vpn-ntw, sap, and ac-ntw| .-------+-------. | Network | | Orchestration | '-------+-------' Network Configuration Model | .-----------+-----------. | | .--------+------. .--------+------. | Domain | | Domain | | Orchestration | | Orchestration | '---+-----------' '--------+------' Device | | | Configuration | | | Model | | | .----+----. | | | Config | | | | Manager | | | '----+----' | | | | | | NETCONF/CLI.................. | | | .--------------------------------. .----. Bearer | | Bearer .----. |CE#1+--------+ Network +--------+CE#2| '----' | | '----' '--------------------------------' Site A Site B Figure 2: An Example of the Network AC Model Usage 4. Description of the Attachment Circuit YANG Module The full tree diagram of the module can be generated using the "pyang" tool [PYANG]. That tree is not included here because it is too long (Section 3.3 of [RFC8340]). Instead, subtrees are provided in the following subsections for the reader's convenience. Boucadair, et al. Expires 2 June 2024 [Page 7] Internet-Draft A YANG Network Model for ACs November 2023 4.1. Overall Structure of the Module The overall tree structure of the module is shown in Figure 3. augment /nw:networks/nw:network: +--rw specific-provisioning-profiles | ... +--rw ac-profile* [name] ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string +--rw ac-svc-ref? ac-svc:attachment-circuit-reference +--rw ac-profile* [profile-id] | +--rw profile-id -> /nw:networks/network/ac-profile/name +--rw ac-parent-ref? ac-ntw:attachment-circuit-reference +--rw peer-sap-id* string +--rw group* [group-id] | +--rw group-id string | +--rw precedence? identityref +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw description? string +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 3: Overall Tree Structure The full tree of the 'ac-ntw' is provided in [AC-Ntw-Tree]. A node can host one or more SAPs. As per [RFC9408], a SAP is an abstraction of the network reference points (the PE side of an AC, in the context of this document) where network services can be delivered Boucadair, et al. Expires 2 June 2024 [Page 8] Internet-Draft A YANG Network Model for ACs November 2023 and/or are delivered to customers. Each SAP terminates one or multiple ACs. Each AC in turn may be terminated by one or more peer SAPs ('peer-sap'). In order to expose such AC/SAP binding information, the SAP model [RFC9408] is augmented with required AC- related information. Unlike the AC service model [I-D.ietf-opsawg-teas-attachment-circuit], an AC is uniquely identified by a name within the scope of a node, not a network. A textual description of the AC may be provided ('description'). Also, in order to ease the correlation between the AC exposed at the service layer and the one that is actually provisioned in the network operation, a reference to the AC exposed to the customer ('ac-svc- ref') is stored in the 'ietf-ac-ntw' module. A controller may indicate a filter based on the service type (e.g., Network Slice or L3VPN) to retrieve the list of available ACs for that service. In order to factorize common data that is provisioned for a group of ACs, a set of profiles (Section 4.2) can be defined at the network level, and then called under the node level. The information contained in a profile is thus inherited, unless the corresponding data node is refined at the AC level. In such a case, the value provided at the AC level takes precedence over the global one. In contexts where the same AC is terminated by multiple peer SAPs (e.g., an AC with multiple CEs) but a subset of them have specific information, the module allows operators to: * Define a parent AC that may list all these CEs as peer SAPs. * Create individual ACs that are bound to the parent AC using 'ac- parent-ref'. * Indicate for each individual ACs one or a subset of the CEs as peer SAPs. All these individual ACs will inherit the properties of the parent AC. Whenever a parent AC is deleted, then all child ACs of that AC MUST be deleted. An AC may belong to one or multiple groups [RFC9181]. For example, the 'group-id' is used to associate redundancy or protection constraints with ACs. Boucadair, et al. Expires 2 June 2024 [Page 9] Internet-Draft A YANG Network Model for ACs November 2023 The status of an AC can be tracked using 'status'. Both operational status and administrative status are maintained. A mismatch between the administrative status vs. the operational status can be used as a trigger to detect anomalies. An AC can be characterized using Layer 2 connectivity (Section 4.3), Layer 3 connectivity (Section 4.4), routing protocols (Section 4.5), OAM (Section 4.6), security (Section 4.7), and service (Section 4.8) considerations. 4.2. Provisioning Profiles The specific provisioning profiles tree structure is shown in Figure 4. augment /nw:networks/nw:network: +--rw specific-provisioning-profiles | +--rw valid-provider-identifiers | +--rw encryption-profile-identifier* [id] | | +--rw id string | +--rw qos-profile-identifier* [id] | | +--rw id string | +--rw bfd-profile-identifier* [id] | | +--rw id string | +--rw forwarding-profile-identifier* [id] | | +--rw id string | +--rw routing-profile-identifier* [id] | +--rw id string +--rw ac-profile* [name] ... Figure 4: Profiles Tree Structure The exact definition of these profiles is local to each service provider. The model only includes an identifier for these profiles in order to ease identifying and binding local policies when building an AC. As shown in Figure 4, the following identifiers can be included: 'encryption-profile-identifier': An encryption profile refers to a set of policies related to the encryption schemes and setup that can be applied on the AC. 'qos-profile-identifier': A Quality of Service (QoS) profile refers to a set of policies such as classification, marking, and actions (e.g., [RFC3644]). 'bfd-profile-identifier': A Bidirectional Forwarding Detection (BFD) Boucadair, et al. Expires 2 June 2024 [Page 10] Internet-Draft A YANG Network Model for ACs November 2023 profile refers to a set of BFD policies [RFC5880] that can be invoked when building an AC. 'forwarding-profile-identifier': A forwarding profile refers to the policies that apply to the forwarding of packets conveyed over an AC. Such policies may consist of, for example, applying Access Control Lists (ACLs). 'routing-profile-identifier': A routing profile refers to a set of routing policies that will be invoked (e.g., BGP policies) for an AC. 4.3. L2 Connection The 'l2-connection' container is used to manage the Layer 2 properties of an AC. The Layer 2 connection tree structure is shown in Figure 5. augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string +--rw ac-svc-ref? ac-svc:attachment-circuit-reference +--rw ac-profile* [profile-id] | +--rw profile-id ac-profile-reference +--rw ac-parent-ref? ac-ntw:attachment-circuit-reference +--rw peer-sap-id* string +--rw group* [group-id] | +--rw group-id string | +--rw precedence? identityref +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw description? string +--rw l2-connection | +--rw encapsulation | | +--rw encap-type? identityref | | +--rw dot1q | | | +--rw tag-type? identityref | | | +--rw cvlan-id? uint16 | | | +--rw tag-operations | | | +--rw (op-choice)? | | | | +--:(pop) | | | | | +--rw pop? empty | | | | +--:(push) Boucadair, et al. Expires 2 June 2024 [Page 11] Internet-Draft A YANG Network Model for ACs November 2023 | | | | | +--rw push? empty | | | | +--:(translate) | | | | +--rw translate? empty | | | +--rw tag-1? dot1q-types:vlanid | | | +--rw tag-1-type? | | | | dot1q-types:dot1q-tag-type | | | +--rw tag-2? dot1q-types:vlanid | | | +--rw tag-2-type? | | | dot1q-types:dot1q-tag-type | | +--rw priority-tagged | | | +--rw tag-type? identityref | | +--rw qinq | | +--rw tag-type? identityref | | +--rw svlan-id uint16 | | +--rw cvlan-id uint16 | | +--rw tag-operations | | +--rw (op-choice)? | | | +--:(pop) | | | | +--rw pop? uint8 | | | +--:(push) | | | | +--rw push? empty | | | +--:(translate) | | | +--rw translate? uint8 | | +--rw tag-1? dot1q-types:vlanid | | +--rw tag-1-type? | | | dot1q-types:dot1q-tag-type | | +--rw tag-2? dot1q-types:vlanid | | +--rw tag-2-type? | | dot1q-types:dot1q-tag-type | +--rw (l2-service)? | | +--:(l2-tunnel-service) | | | +--rw l2-tunnel-service | | | +--rw type? identityref | | | +--rw pseudowire | | | | +--rw vcid? uint32 | | | | +--rw far-end? union | | | +--rw vpls | | | | +--rw vcid? uint32 | | | | +--rw far-end* union | | | +--rw vxlan | | | +--rw vni-id uint32 | | | +--rw peer-mode? identityref | | | +--rw peer-ip-address* inet:ip-address | | +--:(l2vpn) | | +--rw l2vpn-id? vpn-common:vpn-id | +--rw l2-termination-point? string | +--rw local-bridge-reference? string | +--rw bearer-reference? string Boucadair, et al. Expires 2 June 2024 [Page 12] Internet-Draft A YANG Network Model for ACs November 2023 | | {vpn-common:bearer-reference}? | +--rw lag-interface {vpn-common:lag-interface}? | +--rw lag-interface-id? string | +--rw member-link-list | +--rw member-link* [name] | +--rw name string +--rw ip-connection | ... +--rw routing-protocols | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 5: Layer 2 Connection Tree Structure The 'encapsulation' container specifies the Layer 2 encapsulation to use (if any) and allows the configuration of the relevant tags. Also, the model supports tag manipulation operations (e.g., tag rewrite). The 'l2-tunnel-service' container is used to specify the required parameters to set a Layer tunneling service (e.g., a Virtual Private LAN Service (VPLS), a Virtual eXtensible Local Area Network (VXLAN), or a pseudowire (Section 6.1 of [RFC8077])). 'l2vpn-id' is used to identify a L2VPN service that is associated with an Integrated Routing and Bridging (IRB) interface. To accommodate implementations that require internal bridging, a local bridge reference can be specified in 'local-bridge-reference'. Such a reference may be a local bridge domain. A reference to the bearer is maintained using 'bearer-reference'. 4.4. IP Connection This 'ip-connection' container is used to group Layer 3 connectivity information, particularly the IP addressing information, of an AC. The Layer 3 connection tree structure is shown in Figure 6. Boucadair, et al. Expires 2 June 2024 [Page 13] Internet-Draft A YANG Network Model for ACs November 2023 augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string +--rw ac-svc-ref? ac-svc:attachment-circuit-reference +--rw ac-profile* [profile-id] | +--rw profile-id ac-profile-reference +--rw ac-parent-ref? ac-ntw:attachment-circuit-reference +--rw peer-sap-id* string +--rw group* [group-id] | +--rw group-id string | +--rw precedence? identityref +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw description? string +--rw l2-connection | ... +--rw ip-connection | +--rw l3-termination-point? string | +--rw ipv4 {vpn-common:ipv4}? | | +--rw local-address? | | | inet:ipv4-address | | +--rw prefix-length? uint8 | | +--rw address-allocation-type? | | | identityref | | +--rw (allocation-type)? | | +--:(dynamic) | | | +--rw (address-assign)? | | | | +--:(number) | | | | | +--rw number-of-dynamic-address? uint16 | | | | +--:(explicit) | | | | +--rw customer-addresses | | | | +--rw address-pool* [pool-id] | | | | +--rw pool-id string | | | | +--rw start-address | | | | | inet:ipv4-address | | | | +--rw end-address? | | | | inet:ipv4-address | | | +--rw (provider-dhcp)? | | | | +--:(dhcp-service-type) | | | | | +--rw dhcp-service-type? | | | | | enumeration | | | | +--:(service-type) | | | | +--rw (service-type)? Boucadair, et al. Expires 2 June 2024 [Page 14] Internet-Draft A YANG Network Model for ACs November 2023 | | | | +--:(relay) | | | | +--rw server-ip-address* | | | | inet:ipv4-address | | | +--rw (dhcp-relay)? | | | +--:(customer-dhcp-servers) | | | +--rw customer-dhcp-servers | | | +--rw server-ip-address* | | | inet:ipv4-address | | +--:(static-addresses) | | +--rw address* [address-id] | | +--rw address-id string | | +--rw customer-address? inet:ipv4-address | +--rw ipv6 {vpn-common:ipv6}? | +--rw local-address? | | inet:ipv6-address | +--rw prefix-length? uint8 | +--rw address-allocation-type? | | identityref | +--rw (allocation-type)? | +--:(dynamic) | | +--rw (address-assign)? | | | +--:(number) | | | | +--rw number-of-dynamic-address? uint16 | | | +--:(explicit) | | | +--rw customer-addresses | | | +--rw address-pool* [pool-id] | | | +--rw pool-id string | | | +--rw start-address | | | | inet:ipv6-address | | | +--rw end-address? | | | inet:ipv6-address | | +--rw (provider-dhcp)? | | | +--:(dhcp-service-type) | | | | +--rw dhcp-service-type? | | | | enumeration | | | +--:(service-type) | | | +--rw (service-type)? | | | +--:(relay) | | | +--rw server-ip-address* | | | inet:ipv6-address | | +--rw (dhcp-relay)? | | +--:(customer-dhcp-servers) | | +--rw customer-dhcp-servers | | +--rw server-ip-address* | | inet:ipv6-address | +--:(static-addresses) | +--rw address* [address-id] | +--rw address-id string Boucadair, et al. Expires 2 June 2024 [Page 15] Internet-Draft A YANG Network Model for ACs November 2023 | +--rw customer-address? inet:ipv6-address +--rw routing-protocols | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 6: IP Connection Tree Structure A distinct Layer 3 interface other than the interface indicated under the 'l2-connection' container may be needed to terminate the Layer 3 connectivity. The identifier of such an interface is included in 'l3-termination-point'. For example, this data node can be used to carry the identifier of a bridge domain interface. This container can include IPv4, IPv6, or both if dual-stack is enabled. For both IPv4 and IPv6, the IP connection supports three IP address assignment modes for customer addresses: provider DHCP, DHCP relay, and static addressing. Note that for the IPv6 case, Stateless Address Autoconfiguration (SLAAC) [RFC4862] can be used. For both IPv4 and IPv6, 'address-allocation-type' is used to indicate the IP address allocation mode to activate for an AC. The allocated address represents the PE interface address configuration. When 'address-allocation-type' is set to 'provider-dhcp', DHCP assignments can be made locally or by an external DHCP server. Such behavior is controlled by setting 'dhcp-service-type'. For IPv6, if 'address-allocation-type' is set to 'slaac', the Prefix Information option of Router Advertisements that will be issued for SLAAC purposes will carry the IPv6 prefix that is determined by 'local-address' and 'prefix-length'. For example, if 'local-address' is set to '2001:db8:0:1::1' and 'prefix-length' is set to '64', the IPv6 prefix that will be used is '2001:db8:0:1::/64'. In some deployment contexts (e.g., network merging), multiple IP subnets may be used in a transition period. For such deployments, multiple ACs (typically, two) with overlapping information may be maintained during a transition period. The correlation between these ACs may rely upon the same "ac-svc-ref". 4.5. Routing The overall routing subtree structure is shown in Figure 7. Boucadair, et al. Expires 2 June 2024 [Page 16] Internet-Draft A YANG Network Model for ACs November 2023 module: ietf-ac-ntw augment /nw:networks/nw:network: +--rw ac-profile* [name] +--rw name string +--rw l2-connection +--rw ip-connection +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | ... +--rw oam ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string ... +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id leafref | | +--rw type? identityref | +--rw static | | ... | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp Boucadair, et al. Expires 2 June 2024 [Page 17] Internet-Draft A YANG Network Model for ACs November 2023 | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 7: Routing Tree Structure Multiple routing instances ('routing-protocol') can be defined, each uniquely identified by an 'id'. Specifically, each instance is uniquely identified to accommodate scenarios where multiple instances of the same routing protocol have to be configured on the same AC. The type of a routing instance is indicated in 'type'. The values of this attribute are those defined in [RFC9181] (the 'routing-protocol- type' identity). Specific data nodes are then provided as a function of the 'type'. See more details in the following subsections. One or multiple routing profiles ('routing-profiles') can be provided for a given routing instance. 4.5.1. Static Routing The static routing subtree structure is shown in Figure 8. module: ietf-ac-ntw ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string ... +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id leafref | | +--rw type? identityref | +--rw static | | +--rw cascaded-lan-prefixes | | +--rw ipv4-lan-prefixes* [lan next-hop] | | | {vpn-common:ipv4}? Boucadair, et al. Expires 2 June 2024 [Page 18] Internet-Draft A YANG Network Model for ACs November 2023 | | | +--rw lan inet:ipv4-prefix | | | +--rw lan-tag? string | | | +--rw next-hop union | | | +--rw metric? uint32 | | | +--rw bfd-enable? boolean {vpn-common:bfd}? | | | +--rw preference? uint32 | | | +--rw status | | | +--rw admin-status | | | | +--rw status? identityref | | | | +--rw last-change? yang:date-and-time | | | +--ro oper-status | | | +--ro status? identityref | | | +--ro last-change? yang:date-and-time | | +--rw ipv6-lan-prefixes* [lan next-hop] | | {vpn-common:ipv6}? | | +--rw lan inet:ipv4-prefix | | +--rw lan-tag? string | | +--rw next-hop union | | +--rw metric? uint32 | | +--rw bfd-enable? boolean {vpn-common:bfd}? | | +--rw preference? uint32 | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 8: Static Routing Tree Structure The following data nodes can be defined for a given IP prefix: Boucadair, et al. Expires 2 June 2024 [Page 19] Internet-Draft A YANG Network Model for ACs November 2023 'lan-tag': Indicates a local tag (e.g., "myfavorite-lan") that is used to enforce local policies. 'next-hop': Indicates the next hop to be used for the static route. It can be identified by an IP address, a predefined next-hop type (e.g., 'discard' or 'local-link'), etc. 'bfd-enable': Indicates whether BFD is enabled or disabled for this static route entry. 'metric': Indicates the metric associated with the static route entry. This metric is used when the route is exported into an IGP. 'preference': Indicates the preference associated with the static route entry. This preference is used to select a preferred route among routes to the same destination prefix. 'status': Used to convey the status of a static route entry. This data node can also be used to control the (de)activation of individual static route entries. 4.5.2. BGP The BGP routing subtree structure is shown in Figure 9. module: ietf-ac-ntw augment /nw:networks/nw:network: +--rw ac-profile* [name] +--rw name string +--rw l2-connection +--rw ip-connection +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw bgp | | +--rw description? string | | +--rw apply-policy | | | +--rw import-policy* leafref | | | +--rw default-import-policy? default-policy-type | | | +--rw export-policy* leafref | | | +--rw default-export-policy? default-policy-type | | +--rw local-as? inet:as-number | | +--rw peer-as inet:as-number Boucadair, et al. Expires 2 June 2024 [Page 20] Internet-Draft A YANG Network Model for ACs November 2023 | | +--rw address-family? identityref | | +--rw multihop? uint8 | | +--rw as-override? boolean | | +--rw allow-own-as? uint8 | | +--rw prepend-global-as? boolean | | +--rw send-default-route? boolean | | +--rw site-of-origin? rt-types:route-origin | | +--rw ipv6-site-of-origin? | | | rt-types:ipv6-route-origin | | +--rw redistribute-connected* [address-family] | | | +--rw address-family identityref | | | +--rw enable? boolean | | +--rw bgp-max-prefix | | | +--rw max-prefix? uint32 | | | +--rw warning-threshold? decimal64 | | | +--rw violate-action? enumeration | | | +--rw restart-timer? uint32 | | +--rw bgp-timers | | +--rw keepalive? uint16 | | +--rw hold-time? uint16 | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | ... +--rw oam ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string ... +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id leafref | | +--rw type? identityref | +--rw static | | ... | +--rw bgp Boucadair, et al. Expires 2 June 2024 [Page 21] Internet-Draft A YANG Network Model for ACs November 2023 | | +--rw peer-groups | | | +--rw peer-group* [name] | | | +--rw name string | | | +--rw local-address? union | | | +--rw description? string | | | +--rw apply-policy | | | | +--rw import-policy* leafref | | | | +--rw default-import-policy? | | | | | default-policy-type | | | | +--rw export-policy* leafref | | | | +--rw default-export-policy? | | | | default-policy-type | | | +--rw local-as? inet:as-number | | | +--rw peer-as inet:as-number | | | +--rw address-family? identityref | | | +--rw multihop? uint8 | | | +--rw as-override? boolean | | | +--rw allow-own-as? uint8 | | | +--rw prepend-global-as? boolean | | | +--rw send-default-route? boolean | | | +--rw site-of-origin? | | | | rt-types:route-origin | | | +--rw ipv6-site-of-origin? | | | | rt-types:ipv6-route-origin | | | +--rw redistribute-connected* [address-family] | | | | +--rw address-family identityref | | | | +--rw enable? boolean | | | +--rw bgp-max-prefix | | | | +--rw max-prefix? uint32 | | | | +--rw warning-threshold? decimal64 | | | | +--rw violate-action? enumeration | | | | +--rw restart-timer? uint32 | | | +--rw bgp-timers | | | | +--rw keepalive? uint16 | | | | +--rw hold-time? uint16 | | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(ao) | | | | +--rw enable-ao? boolean | | | | +--rw ao-keychain? | | | | key-chain:key-chain-ref | | | +--:(md5) | | | | +--rw md5-keychain? | | | | key-chain:key-chain-ref | | | +--:(explicit) | | | +--rw key-id? uint32 Boucadair, et al. Expires 2 June 2024 [Page 22] Internet-Draft A YANG Network Model for ACs November 2023 | | | +--rw key? string | | | +--rw crypto-algorithm? | | | identityref | | +--rw neighbor* [remote-address] | | +--rw remote-address inet:ip-address | | +--rw local-address? union | | +--rw peer-group? | | | -> ../../peer-groups/peer-group/name | | +--rw description? string | | +--rw apply-policy | | | +--rw import-policy* leafref | | | +--rw default-import-policy? | | | | default-policy-type | | | +--rw export-policy* leafref | | | +--rw default-export-policy? | | | default-policy-type | | +--rw local-as? inet:as-number | | +--rw peer-as inet:as-number | | +--rw address-family? identityref | | +--rw multihop? uint8 | | +--rw as-override? boolean | | +--rw allow-own-as? uint8 | | +--rw prepend-global-as? boolean | | +--rw send-default-route? boolean | | +--rw site-of-origin? | | | rt-types:route-origin | | +--rw ipv6-site-of-origin? | | | rt-types:ipv6-route-origin | | +--rw redistribute-connected* [address-family] | | | +--rw address-family identityref | | | +--rw enable? boolean | | +--rw bgp-max-prefix | | | +--rw max-prefix? uint32 | | | +--rw warning-threshold? decimal64 | | | +--rw violate-action? enumeration | | | +--rw restart-timer? uint32 | | +--rw bgp-timers | | | +--rw keepalive? uint16 | | | +--rw hold-time? uint16 | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(ao) | | | | +--rw enable-ao? boolean | | | | +--rw ao-keychain? | | | | key-chain:key-chain-ref | | | +--:(md5) Boucadair, et al. Expires 2 June 2024 [Page 23] Internet-Draft A YANG Network Model for ACs November 2023 | | | | +--rw md5-keychain? | | | | key-chain:key-chain-ref | | | +--:(explicit) | | | +--rw key-id? uint32 | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 9: BGP Routing Tree Structure The following data nodes are supported for each 'peer-group': 'name': Defines a name for the peer group. 'local-address': Specifies an address or a reference to an interface to use when establishing the BGP transport session. 'description': Includes a description of the peer group. 'apply-policy': Lists a set of import/export policies [RFC9067] to apply for this group. 'local-as': Indicates a local AS Number (ASN). 'peer-as': Indicates the peer's ASN. 'address-family': Indicates the address family of the peer. It can be set to 'ipv4', 'ipv6', or 'dual-stack'. Boucadair, et al. Expires 2 June 2024 [Page 24] Internet-Draft A YANG Network Model for ACs November 2023 This address family will be used together with the 'vpn-type' to derive the appropriate Address Family Identifiers (AFIs) / Subsequent Address Family Identifiers (SAFIs) that will be part of the derived device configurations (e.g., unicast IPv4 MPLS L3VPN (AFI,SAFI = 1,128) as defined in Section 4.3.4 of [RFC4364]). 'multihop': Indicates the number of allowed IP hops to reach a BGP peer. 'as-override': If set, this parameter indicates whether ASN override is enabled, i.e., replacing the ASN of the customer specified in the AS_PATH BGP attribute with the ASN identified in the 'local- as' attribute. 'allow-own-as': Used in some topologies (e.g., hub-and-spoke) to allow the provider's ASN to be included in the AS_PATH BGP attribute received from a peer. Loops are prevented by setting 'allow-own-as' to a maximum number of the provider's ASN occurrences. By default, this parameter is set to '0' (that is, reject any AS_PATH attribute that includes the provider's ASN). 'prepend-global-as': When distinct ASNs are configured at the node and AC levels, this parameter controls whether the ASN provided at the node level is prepended to the AS_PATH attribute. 'send-default-route': Controls whether default routes can be advertised to the peer. 'site-of-origin': Meant to uniquely identify the set of routes learned from a site via a particular AC. It is used to prevent routing loops (Section 7 of [RFC4364]). The Site of Origin attribute is encoded as a Route Origin Extended Community. 'ipv6-site-of-origin': Carries an IPv6 Address Specific BGP Extended Community that is used to indicate the Site of Origin [RFC5701]. It is used to prevent routing loops. 'redistribute-connected': Controls whether the AC is advertised to other PEs. 'bgp-max-prefix': Controls the behavior when a prefix maximum is reached. 'max-prefix': Indicates the maximum number of BGP prefixes allowed in a session for this group. If the limit is reached, the action indicated in 'violate-action' will be followed. 'warning-threshold': A warning notification is triggered when this Boucadair, et al. Expires 2 June 2024 [Page 25] Internet-Draft A YANG Network Model for ACs November 2023 limit is reached. 'violate-action': : Indicates which action to execute when the maximum number of BGP prefixes is reached. Examples of such actions include sending a warning message, discarding extra paths from the peer, or restarting the session. 'restart-timer': : Indicates, in seconds, the time interval after which the BGP session will be reestablished. 'bgp-timers': Two timers can be captured in this container: (1) 'hold-time', which is the time interval that will be used for the Hold Timer (Section 4.2 of [RFC4271]) when establishing a BGP session and (2) 'keepalive', which is the time interval for the KeepaliveTimer between a PE and a BGP peer (Section 4.4 of [RFC4271]). Both timers are expressed in seconds. 'authentication': The module adheres to the recommendations in Section 13.2 of [RFC4364], as it allows enabling the TCP Authentication Option (TCP-AO) [RFC5925] and accommodates the installed base that makes use of MD5. In addition, the module includes a provision for using IPsec. This version of the model assumes that parameters specific to the TCP-AO are preconfigured as part of the key chain that is referenced in the model. No assumption is made about how such a key chain is preconfigured. However, the structure of the key chain should cover data nodes beyond those in [RFC8177], mainly SendID and RecvID (Section 3.1 of [RFC5925]). For each neighbor, the following data nodes are supported in addition to similar parameters that are provided for a peer group: 'remote-address': Specifies the remote IP address of a BGP neighbor. 'peer-group': A name of a peer group. Parameters that are provided at the 'neighbor' level takes precedence over the ones provided in the peer group. 'status': Indicates the status of the BGP session. Boucadair, et al. Expires 2 June 2024 [Page 26] Internet-Draft A YANG Network Model for ACs November 2023 4.5.3. OSPF The OSPF routing subtree structure is shown in Figure 10. module: ietf-ac-ntw augment /nw:networks/nw:network: +--rw ac-profile* [name] +--rw name string +--rw l2-connection +--rw ip-connection +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw bgp | | ... | +--rw ospf | | +--rw address-family? identityref | | +--rw area-id yang:dotted-quad | | +--rw metric? uint16 | | +--rw max-lsa? uint32 | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | ... +--rw oam ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string ... +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id leafref | | +--rw type? identityref | +--rw static | | ... | +--rw bgp | | ... Boucadair, et al. Expires 2 June 2024 [Page 27] Internet-Draft A YANG Network Model for ACs November 2023 | +--rw ospf | | +--rw address-family? identityref | | +--rw area-id yang:dotted-quad | | +--rw metric? uint16 | | +--rw sham-links {vpn-common:rtg-ospf-sham-link}? | | | +--rw sham-link* [target-site] | | | +--rw target-site string | | | +--rw metric? uint16 | | +--rw max-lsa? uint32 | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(auth-key-chain) | | | | +--rw key-chain? | | | | key-chain:key-chain-ref | | | +--:(auth-key-explicit) | | | +--rw key-id? uint32 | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 10: OSPF Routing Tree Structure The following OSPF data nodes are supported: 'address-family': Indicates whether IPv4, IPv6, or both address families are to be activated. When the IPv4 or dual-stack address family is requested, it is up Boucadair, et al. Expires 2 June 2024 [Page 28] Internet-Draft A YANG Network Model for ACs November 2023 to the implementation (e.g., network orchestrator) to decide whether OSPFv2 [RFC4577] or OSPFv3 [RFC6565] is used to announce IPv4 routes. 'area-id': Indicates the OSPF Area ID. 'metric': Associates a metric with OSPF routes. 'sham-links': Used to create OSPF sham links between two ACs sharing the same area and having a backdoor link (Section 4.2.7 of [RFC4577] and Section 5 of [RFC6565]). 'max-lsa': Sets the maximum number of Link State Advertisements (LSAs) that the OSPF instance will accept. 'authentication': Controls the authentication schemes to be enabled for the OSPF instance. The following options are supported: IPsec for OSPFv3 authentication [RFC4552], and the Authentication Trailer for OSPFv2 [RFC5709] [RFC7474] and OSPFv3 [RFC7166]. 'status': Indicates the status of the OSPF routing instance. 4.5.4. IS-IS The IS-IS routing subtree structure is shown in Figure 11. module: ietf-ac-ntw augment /nw:networks/nw:network: +--rw ac-profile* [name] +--rw name string +--rw l2-connection +--rw ip-connection +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | +--rw address-family? identityref | | +--rw area-address area-address | | +--rw level? identityref | | +--rw metric? uint16 | | +--rw mode? enumeration | +--rw rip | | ... Boucadair, et al. Expires 2 June 2024 [Page 29] Internet-Draft A YANG Network Model for ACs November 2023 | +--rw vrrp | ... +--rw oam ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string ... +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id leafref | | +--rw type? identityref | +--rw static | | ... | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | +--rw address-family? identityref | | +--rw area-address area-address | | +--rw level? identityref | | +--rw metric? uint16 | | +--rw mode? enumeration | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(auth-key-chain) | | | | +--rw key-chain? | | | | key-chain:key-chain-ref | | | +--:(auth-key-explicit) | | | +--rw key-id? uint32 | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref Boucadair, et al. Expires 2 June 2024 [Page 30] Internet-Draft A YANG Network Model for ACs November 2023 | | +--ro last-change? yang:date-and-time | +--rw rip | | ... | +--rw vrrp | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 11: IS-IS Routing Tree Structure The following IS-IS data nodes are supported: 'address-family': Indicates whether IPv4, IPv6, or both address families are to be activated. 'area-address': Indicates the IS-IS area address. 'level': Indicates the IS-IS level: Level 1, Level 2, or both. 'metric': Associates a metric with IS-IS routes. 'mode': Indicates the IS-IS interface mode type. It can be set to 'active' (that is, send or receive IS-IS protocol control packets) or 'passive' (that is, suppress the sending of IS-IS updates through the interface). 'authentication': Controls the authentication schemes to be enabled for the IS-IS instance. Both the specification of a key chain [RFC8177] and the direct specification of key and authentication algorithms are supported. 'status': Indicates the status of the IS-IS routing instance. 4.5.5. RIP The RIP routing subtree structure is shown in Figure 12. Boucadair, et al. Expires 2 June 2024 [Page 31] Internet-Draft A YANG Network Model for ACs November 2023 module: ietf-ac-ntw augment /nw:networks/nw:network: +--rw ac-profile* [name] +--rw name string +--rw l2-connection +--rw ip-connection +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | +--rw address-family? identityref | | +--rw timers | | | +--rw update-interval? uint16 | | | +--rw invalid-interval? uint16 | | | +--rw holddown-interval? uint16 | | | +--rw flush-interval? uint16 | | +--rw default-metric? uint8 | +--rw vrrp | ... +--rw oam ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string ... +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id leafref | | +--rw type? identityref | +--rw static | | ... | +--rw bgp | | ... | +--rw ospf Boucadair, et al. Expires 2 June 2024 [Page 32] Internet-Draft A YANG Network Model for ACs November 2023 | | ... | +--rw isis | | ... | +--rw rip | | +--rw address-family? identityref | | +--rw timers | | | +--rw update-interval? uint16 | | | +--rw invalid-interval? uint16 | | | +--rw holddown-interval? uint16 | | | +--rw flush-interval? uint16 | | +--rw default-metric? uint8 | | +--rw authentication | | | +--rw enable? boolean | | | +--rw keying-material | | | +--rw (option)? | | | +--:(auth-key-chain) | | | | +--rw key-chain? | | | | key-chain:key-chain-ref | | | +--:(auth-key-explicit) | | | +--rw key? string | | | +--rw crypto-algorithm? identityref | | +--rw status | | +--rw admin-status | | | +--rw status? identityref | | | +--rw last-change? yang:date-and-time | | +--ro oper-status | | +--ro status? identityref | | +--ro last-change? yang:date-and-time | +--rw vrrp | ... +--rw oam | ... +--rw security | ... +--rw service ... Figure 12: RIP Routing Tree Structure The following RIP data nodes are supported: 'address-family': Indicates whether IPv4, IPv6, or both address families are to be activated. This parameter is used to determine whether RIPv2 [RFC2453], RIP Next Generation (RIPng), or both are to be enabled [RFC2080]. 'timers': Indicates the following timers (expressed in seconds): Boucadair, et al. Expires 2 June 2024 [Page 33] Internet-Draft A YANG Network Model for ACs November 2023 * 'update-interval': The interval at which RIP updates are sent. * 'invalid-interval': The interval before a RIP route is declared invalid. * 'holddown-interval': The interval before better RIP routes are released. * 'flush-interval': The interval before a route is removed from the routing table. 'default-metric': Sets the default RIP metric. 'authentication': Controls the authentication schemes to be enabled for the RIP instance. 'status': Indicates the status of the RIP routing instance. 4.5.6. VRRP The VRRP subtree structure is shown in Figure 13. module: ietf-ac-ntw augment /nw:networks/nw:network: +--rw ac-profile* [name] +--rw name string +--rw l2-connection +--rw ip-connection +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | +--rw address-family? identityref | +--rw ping-reply? boolean +--rw oam ... augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string Boucadair, et al. Expires 2 June 2024 [Page 34] Internet-Draft A YANG Network Model for ACs November 2023 ... +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | +--rw routing-protocol* [id] | +--rw id string | +--rw type? identityref | +--rw routing-profiles* [id] | | +--rw id leafref | | +--rw type? identityref | +--rw static | | ... | +--rw bgp | | ... | +--rw ospf | | ... | +--rw isis | | ... | +--rw rip | | ... | +--rw vrrp | +--rw address-family? identityref | +--rw vrrp-group? uint8 | +--rw backup-peer? inet:ip-address | +--rw virtual-ip-address* inet:ip-address | +--rw priority? uint8 | +--rw ping-reply? boolean | +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw oam | ... +--rw security | ... +--rw service ... Figure 13: VRRP Tree Structure The following VRRP data nodes are supported: 'address-family': Indicates whether IPv4, IPv6, or both address Boucadair, et al. Expires 2 June 2024 [Page 35] Internet-Draft A YANG Network Model for ACs November 2023 families are to be activated. Note that VRRP version 3 [RFC5798] supports both IPv4 and IPv6. 'vrrp-group': Used to identify the VRRP group. 'backup-peer': Carries the IP address of the peer. 'virtual-ip-address': Includes virtual IP addresses for a single VRRP group. 'priority': Assigns the VRRP election priority for the backup virtual router. 'ping-reply': Controls whether the VRRP speaker should reply to ping requests. 'status': Indicates the status of the VRRP instance. Note that no authentication data node is included for VRRP, as there isn't any type of VRRP authentication at this time (see Section 9 of [RFC5798]). 4.6. OAM The OAM subtree structure is shown in Figure 14. augment /nw:networks/nw:network: +--rw ac-profile* [name] +--rw name string +--rw l2-connection +--rw ip-connection +--rw routing-protocols | ... +--rw oam +--rw bfd {vpn-common:bfd}? +--rw session-type? identityref +--rw desired-min-tx-interval? uint32 +--rw required-min-rx-interval? uint32 +--rw local-multiplier? uint8 +--rw holdtime? uint32 augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string +--rw ac-svc-ref? ac-svc:attachment-circuit-reference +--rw ac-profile* [profile-id] | +--rw profile-id ac-profile-reference +--rw ac-parent-ref? ac-ntw:attachment-circuit-reference +--rw peer-sap-id* string Boucadair, et al. Expires 2 June 2024 [Page 36] Internet-Draft A YANG Network Model for ACs November 2023 +--rw group* [group-id] | +--rw group-id string | +--rw precedence? identityref +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw description? string +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | ... +--rw oam | +--rw bfd | +--rw profile? ac-svc:bfd-profile-reference | +--rw session-type? identityref | +--rw desired-min-tx-interval? uint32 | +--rw required-min-rx-interval? uint32 | +--rw local-multiplier? uint8 | +--rw holdtime? uint32 | +--rw authentication! | | +--rw key-chain? key-chain:key-chain-ref | | +--rw meticulous? boolean | +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw security | ... +--rw service ... Figure 14: OAM Tree Structure The following OAM data nodes can be specified: 'profile': Refers to a BFD profile (Section 4.2). 'session-type': Indicates which BFD flavor is used to set up the Boucadair, et al. Expires 2 June 2024 [Page 37] Internet-Draft A YANG Network Model for ACs November 2023 session (e.g., classic BFD [RFC5880], Seamless BFD [RFC7880]). By default, it is assumed that the BFD session will follow the behavior specified in [RFC5880]. 'desired-min-tx-interval': The minimum interval, in microseconds, to use when transmitting BFD Control packets, less any jitter applied. 'required-min-rx-interval': The minimum interval, in microseconds, between received BFD Control packets less any jitter applied by the sender. 'local-multiplier': The negotiated transmit interval, multiplied by this value, provides the detection time for the peer. 'holdtime': Used to indicate the expected BFD holddown time, in milliseconds. 'authentication': Includes the required information to enable the BFD authentication modes discussed in Section 6.7 of [RFC5880]. In particular, 'meticulous' controls the activation of meticulous mode as discussed in Sections 6.7.3 and 6.7.4 of [RFC5880]. 'status': Indicates the status of BFD. 4.7. Security The security subtree structure is shown in Figure 15. The 'security' container specifies the authentication and the encryption to be applied to traffic for a given AC. Tthe model can be used to directly control the encryption to be applied (e.g., Layer 2 or Layer 3 encryption) or invoke a local encryption profile. Boucadair, et al. Expires 2 June 2024 [Page 38] Internet-Draft A YANG Network Model for ACs November 2023 augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string +--rw ac-svc-ref? ac-svc:attachment-circuit-reference +--rw ac-profile* [profile-id] | +--rw profile-id ac-profile-reference +--rw ac-parent-ref? ac-ntw:attachment-circuit-reference +--rw peer-sap-id* string +--rw group* [group-id] | +--rw group-id string | +--rw precedence? identityref +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw description? string +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | ... +--rw oam | ... +--rw security | +--rw encryption {vpn-common:encryption}? | | +--rw enabled? boolean | | +--rw layer? enumeration | +--rw encryption-profile | +--rw (profile)? | +--:(provider-profile) | | +--rw profile-name? | | encryption-profile-reference | +--:(customer-profile) | +--rw customer-key-chain? key-chain:key-chain-ref +--rw service ... Figure 15: Security Tree Structure 4.8. Service The service subtree structure is shown in Figure 16. Boucadair, et al. Expires 2 June 2024 [Page 39] Internet-Draft A YANG Network Model for ACs November 2023 augment /nw:networks/nw:network/nw:node/sap:service/sap:sap: +--rw ac* [name] +--rw name string +--rw ac-svc-ref? ac-svc:attachment-circuit-reference +--rw ac-profile* [profile-id] | +--rw profile-id ac-profile-reference +--rw ac-parent-ref? ac-ntw:attachment-circuit-reference +--rw peer-sap-id* string +--rw group* [group-id] | +--rw group-id string | +--rw precedence? identityref +--rw status | +--rw admin-status | | +--rw status? identityref | | +--rw last-change? yang:date-and-time | +--ro oper-status | +--ro status? identityref | +--ro last-change? yang:date-and-time +--rw description? string +--rw l2-connection | ... +--rw ip-connection | ... +--rw routing-protocols | ... +--rw oam | ... +--rw security | ... +--rw service +--rw mtu? uint32 +--rw svc-pe-to-ce-bandwidth {vpn-common:inbound-bw}? | +--rw bandwidth* [bw-type] | +--rw bw-type identityref | +--rw (type)? | +--:(per-cos) | | +--rw cos* [cos-id] | | +--rw cos-id uint8 | | +--rw cir? uint64 | | +--rw cbs? uint64 | | +--rw eir? uint64 | | +--rw ebs? uint64 | | +--rw pir? uint64 | | +--rw pbs? uint64 | +--:(other) | +--rw cir? uint64 | +--rw cbs? uint64 | +--rw eir? uint64 Boucadair, et al. Expires 2 June 2024 [Page 40] Internet-Draft A YANG Network Model for ACs November 2023 | +--rw ebs? uint64 | +--rw pir? uint64 | +--rw pbs? uint64 +--rw svc-ce-to-pe-bandwidth {vpn-common:outbound-bw}? | +--rw bandwidth* [bw-type] | +--rw bw-type identityref | +--rw (type)? | +--:(per-cos) | | +--rw cos* [cos-id] | | +--rw cos-id uint8 | | +--rw cir? uint64 | | +--rw cbs? uint64 | | +--rw eir? uint64 | | +--rw ebs? uint64 | | +--rw pir? uint64 | | +--rw pbs? uint64 | +--:(other) | +--rw cir? uint64 | +--rw cbs? uint64 | +--rw eir? uint64 | +--rw ebs? uint64 | +--rw pir? uint64 | +--rw pbs? uint64 +--rw qos {vpn-common:qos}? | +--rw qos-profiles | +--rw qos-profile* [profile] | +--rw profile qos-profile-reference | +--rw direction? identityref +--rw access-control-list +--rw acl-profiles +--rw acl-profile* [profile] +--rw profile forwarding-profile-reference Figure 16: Service Tree Structure The description of the service data nodes is as follows: 'mtu': Specifies the Layer 2 MTU, in bytes, for the VPN network access. 'svc-pe-to-ce-bandwidth' and 'svc-ce-to-pe-bandwidth': Specify the service bandwidth for the L2VPN service. 'svc-pe-to-ce-bandwidth' indicates the inbound bandwidth of the connection (i.e., download bandwidth from the service provider to the site). 'svc-ce-to-pe-bandwidth' indicates the outbound bandwidth of the Boucadair, et al. Expires 2 June 2024 [Page 41] Internet-Draft A YANG Network Model for ACs November 2023 connection (i.e., upload bandwidth from the site to the service provider). 'svc-pe-to-ce-bandwidth' and 'svc-ce-to-pe-bandwidth' can be represented using the Committed Information Rate (CIR), the Excess Information Rate (EIR), or the Peak Information Rate (PIR). The following types, defined in [RFC9181], can be used to indicate the bandwidth type: 'bw-per-cos': The bandwidth is per CoS. 'bw-per-port': The bandwidth is per port. 'bw-per-site': The bandwidth is to all peer SAPs that belong to the same site. 'bw-per-service': The bandwidth is per service instance that is bound to an AC. 'qos': Specifies a list of QoS profiles to apply for this AC. 'access-control-list': Specifies a list of ACL profiles to apply for this AC. 5. YANG Module This module uses types defined in [RFC6991], [RFC8177], [RFC8294], [RFC8343], [RFC9067], [RFC9181], [I-D.ietf-opsawg-teas-common-ac], and [IEEE802.1Qcp]. file ietf-ac-ntw@2022-11-30.yang module ietf-ac-ntw { yang-version 1.1; namespace "urn:ietf:params:xml:ns:yang:ietf-ac-ntw"; prefix ac-ntw; import ietf-vpn-common { prefix vpn-common; reference "RFC 9181: A Common YANG Data Model for Layer 2 and Layer 3 VPNs"; } import ietf-inet-types { prefix inet; reference "RFC 6991: Common YANG Data Types, Section 4"; } Boucadair, et al. Expires 2 June 2024 [Page 42] Internet-Draft A YANG Network Model for ACs November 2023 import ietf-key-chain { prefix key-chain; reference "RFC 8177: YANG Data Model for Key Chains"; } import ietf-routing-types { prefix rt-types; reference "RFC 8294: Common YANG Data Types for the Routing Area"; } import ietf-routing-policy { prefix rt-pol; reference "RFC 9067: A YANG Data Model for Routing Policy"; } import ietf-interfaces { prefix if; reference "RFC 8343: A YANG Data Model for Interface Management"; } import ieee802-dot1q-types { prefix dot1q-types; reference "IEEE Std 802.1Qcp: Bridges and Bridged Networks-- Amendment 30: YANG Data Model"; } import ietf-network { prefix nw; reference "RFC 8345: A YANG Data Model for Network Topologies, Section 6.1"; } import ietf-sap-ntw { prefix sap; reference "RFC SSSS: A YANG Network Model for Service Attachment Points (SAPs)"; } import ietf-ac-common { prefix ac-common; reference "RFC CCCC: A Common YANG Data Model for Attachment Circuits"; } import ietf-ac-svc { prefix ac-svc; reference "RFC SSSS: YANG Service Data Models for Attachment Circuits"; } Boucadair, et al. Expires 2 June 2024 [Page 43] Internet-Draft A YANG Network Model for ACs November 2023 organization "IETF OPSAWG (Operations and Management Area Working Group)"; contact "WG Web: WG List: Editor: Mohamed Boucadair Author: Richard Roberts "; description "This YANG module defines a YANG model for the management of attachment circuits. Copyright (c) 2023 IETF Trust and the persons identified as authors of the code. All rights reserved. Redistribution and use in source and binary forms, with or without modification, is permitted pursuant to, and subject to the license terms contained in, the Revised BSD License set forth in Section 4.c of the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info). This version of this YANG module is part of RFC xxx; see the RFC itself for full legal notices."; revision 2023-11-13 { description "Initial revision."; reference "RFC XXXX: A YANG Network Data Model for Attachment Circuits"; } // L2 connection groupings /* A set of typedefs to ease referencing cross-modules */ typedef attachment-circuit-reference { type leafref { path "/nw:networks/nw:network/nw:node/sap:service/sap:sap" + "/ac-ntw:ac/ac-ntw:name"; } description "Defines a reference to an attachment circuit that can be used by other modules."; } Boucadair, et al. Expires 2 June 2024 [Page 44] Internet-Draft A YANG Network Model for ACs November 2023 typedef ac-profile-reference { type leafref { path "/nw:networks/nw:network/ac-profile/name"; } description "Defines a reference to an attachment circuit profile that can be used by other modules."; } typedef encryption-profile-reference { type leafref { path "/nw:networks/nw:network" + "/ac-ntw:specific-provisioning-profiles" + "/ac-ntw:valid-provider-identifiers" + "/ac-ntw:encryption-profile-identifier/ac-ntw:id"; } description "Defines a type to an encryption profile for referencing purposes."; } typedef qos-profile-reference { type leafref { path "/nw:networks/nw:network" + "/ac-ntw:specific-provisioning-profiles" + "/ac-ntw:valid-provider-identifiers" + "/ac-ntw:qos-profile-identifier/ac-ntw:id"; } description "Defines a type to a QoS profile for referencing purposes."; } typedef bfd-profile-reference { type leafref { path "/nw:networks/nw:network" + "/ac-ntw:specific-provisioning-profiles" + "/ac-ntw:valid-provider-identifiers" + "/ac-ntw:bfd-profile-identifier/ac-ntw:id"; } description "Defines a type to a BFD profile for referencing purposes."; } typedef forwarding-profile-reference { type leafref { Boucadair, et al. Expires 2 June 2024 [Page 45] Internet-Draft A YANG Network Model for ACs November 2023 path "/nw:networks/nw:network" + "/ac-ntw:specific-provisioning-profiles" + "/ac-ntw:valid-provider-identifiers" + "/ac-ntw:forwarding-profile-identifier/ac-ntw:id"; } description "Defines a type to a forwarding profile for referencing purposes."; } typedef routing-profile-reference { type leafref { path "/nw:networks/nw:network" + "/ac-ntw:specific-provisioning-profiles" + "/ac-ntw:valid-provider-identifiers" + "/ac-ntw:routing-profile-identifier/ac-ntw:id"; } description "Defines a type to a routing profile for referencing purposes."; } // L2 conenction grouping l2-connection { description "Defines Layer 2 protocols and parameters that are required to enable AC connectivity."; container encapsulation { description "Container for Layer 2 encapsulation."; leaf encap-type { type identityref { base vpn-common:encapsulation-type; } description "Tagged interface type."; } container dot1q { when "derived-from-or-self(../encap-type, " + "'vpn-common:dot1q')" { description "Only applies when the type of the tagged interface is 'dot1q'."; } description Boucadair, et al. Expires 2 June 2024 [Page 46] Internet-Draft A YANG Network Model for ACs November 2023 "Tagged interface."; uses ac-common:dot1q; container tag-operations { description "Sets the tag manipulation policy for this AC. It defines a set of tag manipulations that allow for the insertion, removal, or rewriting of 802.1Q VLAN tags. These operations are indicated for the CE-PE direction. By default, tag operations are symmetric. As such, the reverse tag operation is assumed on the PE-CE direction."; choice op-choice { description "Selects the tag rewriting policy for an AC."; leaf pop { type empty; description "Pop the outer tag."; } leaf push { type empty; description "Pushes one or two tags defined by the tag-1 and tag-2 leaves. It is assumed that, absent any policy, the default value of 0 will be used for the PCP setting."; } leaf translate { type empty; description "Translates the outer tag to one or two tags. PCP bits are preserved."; } } leaf tag-1 { when 'not(../pop)'; type dot1q-types:vlanid; description "A first tag to be used for push or translate operations. This tag will be used as the outermost tag as a result of the tag operation."; } leaf tag-1-type { type dot1q-types:dot1q-tag-type; default "dot1q-types:s-vlan"; description "Specifies a specific 802.1Q tag type of tag-1."; } Boucadair, et al. Expires 2 June 2024 [Page 47] Internet-Draft A YANG Network Model for ACs November 2023 leaf tag-2 { when '(../translate)'; type dot1q-types:vlanid; description "A second tag to be used for translation."; } leaf tag-2-type { type dot1q-types:dot1q-tag-type; default "dot1q-types:c-vlan"; description "Specifies a specific 802.1Q tag type of tag-2."; } } } container priority-tagged { when "derived-from-or-self(../encap-type, " + "'vpn-common:priority-tagged')" { description "Only applies when the type of the tagged interface is 'priority-tagged'."; } description "Priority tagged container."; uses ac-common:priority-tagged; } container qinq { when "derived-from-or-self(../encap-type, " + "'vpn-common:qinq')" { description "Only applies when the type of the tagged interface is 'QinQ'."; } description "Includes QinQ parameters."; uses ac-common:qinq; container tag-operations { description "Sets the tag manipulation policy for this AC. It defines a set of tag manipulations that allow for the insertion, removal, or rewriting of 802.1Q VLAN tags. These operations are indicated for the CE-PE direction. By default, tag operations are symmetric. As such, the reverse tag operation is assumed on the PE-CE direction."; choice op-choice { description "Selects the tag rewriting policy for a AC."; leaf pop { Boucadair, et al. Expires 2 June 2024 [Page 48] Internet-Draft A YANG Network Model for ACs November 2023 type uint8 { range "1|2"; } description "Pops one or two tags as a function of the indicated pop value."; } leaf push { type empty; description "Pushes one or two tags defined by the tag-1 and tag-2 leaves. It is assumed that, absent any policy, the default value of 0 will be used for PCP setting."; } leaf translate { type uint8 { range "1|2"; } description "Translates one or two outer tags. PCP bits are preserved. The following operations are supported: - translate 1 with tag-1 leaf is provided: only the outermost tag is translated to the value in tag-1. - translate 2 with both tag-1 and tag-2 leaves are provided: both outer and inner tags are translated to the values in tag-1 and tag-2, respectively. - translate 2 with tag-1 leaf is provided: the outer tag is popped while the inner tag is translated to the value in tag-1."; } } leaf tag-1 { when 'not(../pop)'; type dot1q-types:vlanid; description "A first tag to be used for push or translate operations. This tag will be used as the outermost tag as a result of the tag operation."; } leaf tag-1-type { type dot1q-types:dot1q-tag-type; default "dot1q-types:s-vlan"; description "Specifies a specific 802.1Q tag type of tag-1."; Boucadair, et al. Expires 2 June 2024 [Page 49] Internet-Draft A YANG Network Model for ACs November 2023 } leaf tag-2 { when 'not(../pop)'; type dot1q-types:vlanid; description "A second tag to be used for push or translate operations."; } leaf tag-2-type { type dot1q-types:dot1q-tag-type; default "dot1q-types:c-vlan"; description "Specifies a specific 802.1Q tag type of tag-2."; } } } } choice l2-service { description "The Layer 2 connectivity service can be provided by indicating a pointer to an L2VPN or by specifying a Layer 2 tunnel service."; container l2-tunnel-service { description "Defines a Layer 2 tunnel termination."; uses ac-common:l2-tunnel-service; } case l2vpn { leaf l2vpn-id { type vpn-common:vpn-id; description "Indicates the L2VPN service associated with an Integrated Routing and Bridging (IRB) interface."; } } } } grouping l2-connection-if-ref { description "Specifies Layer 2 connection paramters with interface references."; uses l2-connection; leaf l2-termination-point { type string; description "Specifies a reference to a local Layer 2 termination point, such as a Layer 2 sub-interface."; Boucadair, et al. Expires 2 June 2024 [Page 50] Internet-Draft A YANG Network Model for ACs November 2023 } leaf local-bridge-reference { type string; description "Specifies a local bridge reference to accommodate, e.g., implementations that require internal bridging. A reference may be a local bridge domain."; } leaf bearer-reference { if-feature "vpn-common:bearer-reference"; type string; description "This is an internal reference for the service provider to identify the bearer associated with this AC."; } container lag-interface { if-feature "vpn-common:lag-interface"; description "Container for configuration of Link Aggregation Group (LAG) interface attributes."; leaf lag-interface-id { type string; description "LAG interface identifier."; } container member-link-list { description "Container for the member link list."; list member-link { key "name"; description "Member link."; leaf name { type string; description "Member link name."; } } } } } // IPv4 connection groupings grouping ipv4-connection { description "IPv4-specific parameters."; leaf local-address { Boucadair, et al. Expires 2 June 2024 [Page 51] Internet-Draft A YANG Network Model for ACs November 2023 type inet:ipv4-address; description "The IP address used at the provider's interface."; } uses ac-common:ipv4-allocation-type; choice allocation-type { description "Choice of the IPv4 address allocation."; case dynamic { description "When the addresses are allocated by DHCP or other dynamic means local to the infrastructure."; choice address-assign { description "A choice for how IPv4 addresses are assigned."; case number { leaf number-of-dynamic-address { type uint16; description "Specifies the number of IP addresses to be assigned to the customer on this access."; } } case explicit { container customer-addresses { description "Container for customer addresses to be allocated using DHCP."; list address-pool { key "pool-id"; description "Describes IP addresses to be dyncamically allocated. When only 'start-address' is present, it represents a single address. When both 'start-address' and 'end-address' are specified, it implies a range inclusive of both addresses."; leaf pool-id { type string; description "A pool identifier for the address range from 'start-address' to 'end-address'."; } leaf start-address { type inet:ipv4-address; Boucadair, et al. Expires 2 June 2024 [Page 52] Internet-Draft A YANG Network Model for ACs November 2023 mandatory true; description "Indicates the first address in the pool."; } leaf end-address { type inet:ipv4-address; description "Indicates the last address in the pool."; } } } } } choice provider-dhcp { description "Parameters related to DHCP-allocated addresses. IP addresses are allocated by DHCP, which is provided by the operator."; leaf dhcp-service-type { type enumeration { enum server { description "Local DHCP server."; } enum relay { description "Local DHCP relay. DHCP requests are relayed to a provider's server."; } } description "Indicates the type of DHCP service to be enabled on this access."; } choice service-type { description "Choice based on the DHCP service type."; case relay { description "Container for a list of the provider's DHCP servers (i.e., 'dhcp-service-type' is set to 'relay')."; leaf-list server-ip-address { type inet:ipv4-address; description "IPv4 addresses of the provider's DHCP server, for use by the local DHCP relay."; } } Boucadair, et al. Expires 2 June 2024 [Page 53] Internet-Draft A YANG Network Model for ACs November 2023 } } choice dhcp-relay { description "The DHCP relay is provided by the operator."; container customer-dhcp-servers { description "Container for a list of the customer's DHCP servers."; leaf-list server-ip-address { type inet:ipv4-address; description "IPv4 addresses of the customer's DHCP server."; } } } } case static-addresses { description "Lists the IPv4 addresses that are used."; list address { key "address-id"; ordered-by user; description "Lists the IPv4 addresses that are used. The first address of the list is the primary address of the connection."; leaf address-id { type string; description "An identifier of the static IPv4 address."; } leaf customer-address { type inet:ipv4-address; description "An IPv4 address of the customer side."; } } } } } grouping ipv6-connection { description "IPv6-specific parameters."; leaf local-address { type inet:ipv6-address; description "IPv6 address of the provider side."; Boucadair, et al. Expires 2 June 2024 [Page 54] Internet-Draft A YANG Network Model for ACs November 2023 } uses ac-common:ipv6-allocation-type; choice allocation-type { description "Choice of the IPv6 address allocation."; case dynamic { description "When the addresses are allocated by DHCP or other dynamic means local to the infrastructure."; choice address-assign { description "A choice for how IPv6 addresses are assigned."; case number { leaf number-of-dynamic-address { type uint16; description "Specifies the number of IP addresses to be assigned to the customer on this access."; } } case explicit { container customer-addresses { description "Container for customer addresses to be allocated using DHCP."; list address-pool { key "pool-id"; description "Describes IP addresses to be dyncamically allocated. When only 'start-address' is present, it represents a single address. When both 'start-address' and 'end-address' are specified, it implies a range inclusive of both addresses."; leaf pool-id { type string; description "A pool identifier for the address range from 'start-address' to 'end-address'."; } leaf start-address { type inet:ipv6-address; mandatory true; description "Indicates the first address in the pool."; Boucadair, et al. Expires 2 June 2024 [Page 55] Internet-Draft A YANG Network Model for ACs November 2023 } leaf end-address { type inet:ipv6-address; description "Indicates the last address in the pool."; } } } } } choice provider-dhcp { description "Parameters related to DHCP-allocated addresses. IP addresses are allocated by DHCP, which is provided by the operator."; leaf dhcp-service-type { type enumeration { enum server { description "Local DHCP server."; } enum relay { description "Local DHCP relay. DHCP requests are relayed to a provider's server."; } } description "Indicates the type of DHCP service to be enabled on this access."; } choice service-type { description "Choice based on the DHCP service type."; case relay { description "Container for a list of the provider's DHCP servers (i.e., 'dhcp-service-type' is set to 'relay')."; leaf-list server-ip-address { type inet:ipv6-address; description "IPv6 addresses of the provider's DHCP server, for use by the local DHCP relay."; } } } } choice dhcp-relay { Boucadair, et al. Expires 2 June 2024 [Page 56] Internet-Draft A YANG Network Model for ACs November 2023 description "The DHCP relay is provided by the operator."; container customer-dhcp-servers { description "Container for a list of the customer's DHCP servers."; leaf-list server-ip-address { type inet:ipv6-address; description "IPv6 addresses of the customer's DHCP server."; } } } } case static-addresses { description "Lists the IPv4 addresses that are used."; list address { key "address-id"; ordered-by user; description "Lists the IPv6 addresses that are used. The first address of the list is the primary address of the connection."; leaf address-id { type string; description "An identifier of the static IPv4 address."; } leaf customer-address { type inet:ipv6-address; description "An IPv6 address of the customer side."; } } } } } grouping ip-connection { description "Defines IP connection parameters."; leaf l3-termination-point { type string; description "Specifies a reference to a local Layer 3 termination point, such as a bridge domain interface."; } container ipv4 { Boucadair, et al. Expires 2 June 2024 [Page 57] Internet-Draft A YANG Network Model for ACs November 2023 if-feature "vpn-common:ipv4"; description "IPv4-specific parameters."; uses ipv4-connection; } container ipv6 { if-feature "vpn-common:ipv6"; description "IPv6-specific parameters."; uses ipv6-connection; } } /* Routing */ //BGP base parameters grouping bgp-base { description "Configuration specific to BGP."; leaf description { type string; description "Includes a description of the BGP session. This description is meant to be used for diagnostic purposes. The semantic of the description is local to an implementation."; } uses rt-pol:apply-policy-group; leaf local-as { type inet:as-number; description "Indicates a local AS Number (ASN), if an ASN distinct from the ASN configured at the AC level is needed."; } leaf peer-as { type inet:as-number; mandatory true; description "Indicates the customer's ASN when the customer requests BGP routing."; } leaf address-family { type identityref { base vpn-common:address-family; } description "This node contains the address families to be activated. 'dual-stack' means that both IPv4 and IPv6 will be activated."; Boucadair, et al. Expires 2 June 2024 [Page 58] Internet-Draft A YANG Network Model for ACs November 2023 } leaf multihop { type uint8; description "Describes the number of IP hops allowed between a given BGP neighbor and the PE."; } leaf as-override { type boolean; description "Defines whether ASN override is enabled, i.e., replacing the ASN of the customer specified in the AS_PATH attribute with the local ASN."; } leaf allow-own-as { type uint8; description "If set, specifies the maximum number of occurrences of the provider's ASN that are permitted within the AS_PATH before it is rejected."; } leaf prepend-global-as { type boolean; description "In some situations, the ASN that is provided at the node level may be distinct from the ASN configured at the AC. When such ASNs are provided, they are both prepended to the BGP route updates for this AC. To disable that behavior, 'prepend-global-as' must be set to 'false'. In such a case, the ASN that is provided at the node level is not prepended to the BGP route updates for this access."; } leaf send-default-route { type boolean; description "Defines whether default routes can be advertised to a peer. If set, the default routes are advertised to a peer."; } leaf site-of-origin { when "../address-family = 'vpn-common:ipv4' " + "or 'vpn-common:dual-stack'" { description "Only applies if IPv4 is activated."; } type rt-types:route-origin; description "The Site of Origin attribute is encoded as a Route Origin Extended Community. It is meant to uniquely identify the Boucadair, et al. Expires 2 June 2024 [Page 59] Internet-Draft A YANG Network Model for ACs November 2023 set of routes learned from a site via a particular AC and is used to prevent routing loops."; reference "RFC 4364: BGP/MPLS IP Virtual Private Networks (VPNs), Section 7"; } leaf ipv6-site-of-origin { when "../address-family = 'vpn-common:ipv6' " + "or 'vpn-common:dual-stack'" { description "Only applies if IPv6 is activated."; } type rt-types:ipv6-route-origin; description "The IPv6 Site of Origin attribute is encoded as an IPv6 Route Origin Extended Community. It is meant to uniquely identify the set of routes learned from a site."; reference "RFC 5701: IPv6 Address Specific BGP Extended Community Attribute"; } list redistribute-connected { key "address-family"; description "Indicates, per address family, the policy to follow for connected routes."; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates the address family."; } leaf enable { type boolean; description "Enables the redistribution of connected routes."; } } container bgp-max-prefix { description "Controls the behavior when a prefix maximum is reached."; leaf max-prefix { type uint32; description "Indicates the maximum number of BGP prefixes allowed in the BGP session. Boucadair, et al. Expires 2 June 2024 [Page 60] Internet-Draft A YANG Network Model for ACs November 2023 It allows control of how many prefixes can be received from a neighbor. If the limit is exceeded, the action indicated in 'violate-action' will be followed."; reference "RFC 4271: A Border Gateway Protocol 4 (BGP-4), Section 8.2.2"; } leaf warning-threshold { type decimal64 { fraction-digits 5; range "0..100"; } units "percent"; description "When this value is reached, a warning notification will be triggered."; } leaf violate-action { type enumeration { enum warning { description "Only a warning message is sent to the peer when the limit is exceeded."; } enum discard-extra-paths { description "Discards extra paths when the limit is exceeded."; } enum restart { description "The BGP session restarts after the indicated time interval."; } } description "If the BGP neighbor 'max-prefix' limit is reached, the action indicated in 'violate-action' will be followed."; } leaf restart-timer { type uint32; units "seconds"; description "Time interval after which the BGP session will be reestablished."; } } Boucadair, et al. Expires 2 June 2024 [Page 61] Internet-Draft A YANG Network Model for ACs November 2023 container bgp-timers { description "Includes two BGP timers."; leaf keepalive { type uint16 { range "0..21845"; } units "seconds"; description "This timer indicates the KEEPALIVE messages' frequency between a PE and a BGP peer. If set to '0', it indicates that KEEPALIVE messages are disabled. It is suggested that the maximum time between KEEPALIVE messages be one-third of the Hold Time interval."; reference "RFC 4271: A Border Gateway Protocol 4 (BGP-4), Section 4.4"; } leaf hold-time { type uint16 { range "0 | 3..65535"; } units "seconds"; description "Indicates the maximum number of seconds that may elapse between the receipt of successive KEEPALIVE and/or UPDATE messages from the peer. The Hold Time must be either zero or at least three seconds."; reference "RFC 4271: A Border Gateway Protocol 4 (BGP-4), Section 4.2"; } } } // RIP base parameters grouping rip-base { description "Configuration specific to RIP routing."; leaf address-family { type identityref { base vpn-common:address-family; Boucadair, et al. Expires 2 June 2024 [Page 62] Internet-Draft A YANG Network Model for ACs November 2023 } description "Indicates whether IPv4, IPv6, or both address families are to be activated."; } container timers { description "Indicates the RIP timers."; reference "RFC 2453: RIP Version 2"; leaf update-interval { type uint16 { range "1..32767"; } units "seconds"; description "Indicates the RIP update time, i.e., the amount of time for which RIP updates are sent."; } leaf invalid-interval { type uint16 { range "1..32767"; } units "seconds"; description "The interval before a route is declared invalid after no updates are received. This value is at least three times the value for the 'update-interval' argument."; } leaf holddown-interval { type uint16 { range "1..32767"; } units "seconds"; description "Specifies the interval before better routes are released."; } leaf flush-interval { type uint16 { range "1..32767"; } units "seconds"; description "Indicates the RIP flush timer, i.e., the amount of time that must elapse before a route is removed from the routing table."; } Boucadair, et al. Expires 2 June 2024 [Page 63] Internet-Draft A YANG Network Model for ACs November 2023 } leaf default-metric { type uint8 { range "0..16"; } description "Sets the default metric."; } } // routing profile grouping routing-profile { description "Defines routing protocols."; list routing-protocol { key "id"; description "List of routing protocols used on the AC."; leaf id { type string; description "Unique identifier for the routing protocol."; } leaf type { type identityref { base vpn-common:routing-protocol-type; } description "Type of routing protocol."; } container bgp { when "derived-from-or-self(../type, " + "'vpn-common:bgp-routing')" { description "Only applies when the protocol is BGP."; } description "Configuration specific to BGP."; uses bgp-base; } container ospf { when "derived-from-or-self(../type, " + "'vpn-common:ospf-routing')" { description "Only applies when the protocol is OSPF."; } description Boucadair, et al. Expires 2 June 2024 [Page 64] Internet-Draft A YANG Network Model for ACs November 2023 "Configuration specific to OSPF."; uses ac-common:ospf-basic; leaf max-lsa { type uint32 { range "1..4294967294"; } description "Maximum number of allowed Link State Advertisements (LSAs) that the OSPF instance will accept."; } } container isis { when "derived-from-or-self(../type, " + "'vpn-common:isis-routing')" { description "Only applies when the protocol is IS-IS."; } description "Configuration specific to IS-IS."; uses ac-common:isis-basic; leaf level { type identityref { base vpn-common:isis-level; } description "Can be 'level-1', 'level-2', or 'level-1-2'."; reference "RFC 9181: A Common YANG Data Model for Layer 2 and Layer 3 VPNs"; } leaf metric { type uint16; description "Metric of the AC. It is used in the routing state calculation and path selection."; } leaf mode { type enumeration { enum active { description "The interface sends or receives IS-IS protocol control packets."; } enum passive { description "Suppresses the sending of IS-IS updates through the specified interface."; } Boucadair, et al. Expires 2 June 2024 [Page 65] Internet-Draft A YANG Network Model for ACs November 2023 } description "IS-IS interface mode type."; } } container rip { when "derived-from-or-self(../type, " + "'vpn-common:rip-routing')" { description "Only applies when the protocol is RIP."; } description "Configuration specific to RIP routing."; uses rip-base; } container vrrp { when "derived-from-or-self(../type, " + "'vpn-common:vrrp-routing')" { description "Only applies when the protocol is the Virtual Router Redundancy Protocol (VRRP)."; } description "Configuration specific to VRRP."; reference "RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6"; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both address families are to be enabled."; } leaf ping-reply { type boolean; description "Controls whether the VRRP speaker should reply to ping requests."; } } } } grouping routing { description "Defines routing protocols."; Boucadair, et al. Expires 2 June 2024 [Page 66] Internet-Draft A YANG Network Model for ACs November 2023 list routing-protocol { key "id"; description "List of routing protocols used on the AC."; leaf id { type string; description "Unique identifier for the routing protocol."; } leaf type { type identityref { base vpn-common:routing-protocol-type; } description "Type of routing protocol."; } list routing-profiles { key "id"; description "Routing profiles."; leaf id { type routing-profile-reference; description "Routing profile to be used."; } leaf type { type identityref { base vpn-common:ie-type; } description "Import, export, or both."; } } container static { when "derived-from-or-self(../type, " + "'vpn-common:static-routing')" { description "Only applies when the protocol is a static routing protocol."; } description "Configuration specific to static routing."; container cascaded-lan-prefixes { description "LAN prefixes from the customer."; list ipv4-lan-prefixes { if-feature "vpn-common:ipv4"; key "lan next-hop"; Boucadair, et al. Expires 2 June 2024 [Page 67] Internet-Draft A YANG Network Model for ACs November 2023 description "List of LAN prefixes for the site."; uses ac-common:ipv4-static-rtg-entry; leaf bfd-enable { if-feature "vpn-common:bfd"; type boolean; description "Enables BFD."; } leaf preference { type uint32; description "Indicates the preference associated with the static route."; } uses vpn-common:service-status; } list ipv6-lan-prefixes { if-feature "vpn-common:ipv6"; key "lan next-hop"; description "List of LAN prefixes for the site."; uses ac-common:ipv4-static-rtg-entry; leaf bfd-enable { if-feature "vpn-common:bfd"; type boolean; description "Enables BFD."; } leaf preference { type uint32; description "Indicates the preference associated with the static route."; } uses vpn-common:service-status; } } } container bgp { when "derived-from-or-self(../type, " + "'vpn-common:bgp-routing')" { description "Only applies when the protocol is BGP."; } description "Configuration specific to BGP."; container peer-groups { Boucadair, et al. Expires 2 June 2024 [Page 68] Internet-Draft A YANG Network Model for ACs November 2023 description "Configuration for BGP peer-groups"; list peer-group { key "name"; description "List of BGP peer-groups configured on the local system - uniquely identified by peer-group name"; leaf name { type string; description "Name of the BGP peer-group"; } leaf local-address { type union { type inet:ip-address; type if:interface-ref; } description "Sets the local IP address to use for the BGP transport session. This may be expressed as either an IP address or a reference to an interface."; } uses bgp-base; uses ac-common:bgp-authentication; } } list neighbor { key "remote-address"; description "List of BGP neighbors."; leaf remote-address { type inet:ip-address; description "The remote IP address of this entry's BGP peer."; } leaf local-address { type union { type inet:ip-address; type if:interface-ref; } description "Sets the local IP address to use for the BGP transport session. This may be expressed as either an IP address or a reference to an interface."; } leaf peer-group { type leafref { Boucadair, et al. Expires 2 June 2024 [Page 69] Internet-Draft A YANG Network Model for ACs November 2023 path "../../peer-groups/peer-group/name"; } description "The peer-group with which this neighbor is associated."; } uses bgp-base; uses ac-common:bgp-authentication; uses vpn-common:service-status; } } container ospf { when "derived-from-or-self(../type, " + "'vpn-common:ospf-routing')" { description "Only applies when the protocol is OSPF."; } description "Configuration specific to OSPF."; uses ac-common:ospf-basic; container sham-links { if-feature "vpn-common:rtg-ospf-sham-link"; description "List of sham links."; reference "RFC 4577: OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs), Section 4.2.7 RFC 6565: OSPFv3 as a Provider Edge to Customer Edge (PE-CE) Routing Protocol, Section 5"; list sham-link { key "target-site"; description "Creates a sham link with another site."; leaf target-site { type string; description "Target site for the sham link connection. The site is referred to by its identifier."; } leaf metric { type uint16; description "Metric of the sham link. It is used in the routing state calculation and path selection."; reference "RFC 4577: OSPF as the Provider/Customer Edge Boucadair, et al. Expires 2 June 2024 [Page 70] Internet-Draft A YANG Network Model for ACs November 2023 Protocol for BGP/MPLS IP Virtual Private Networks (VPNs), Section 4.2.7.3 RFC 6565: OSPFv3 as a Provider Edge to Customer Edge (PE-CE) Routing Protocol, Section 5.2"; } } } leaf max-lsa { type uint32 { range "1..4294967294"; } description "Maximum number of allowed Link State Advertisements (LSAs) that the OSPF instance will accept."; } uses ac-common:ospf-authentication; uses vpn-common:service-status; } container isis { when "derived-from-or-self(../type, " + "'vpn-common:isis-routing')" { description "Only applies when the protocol is IS-IS."; } description "Configuration specific to IS-IS."; uses ac-common:isis-basic; leaf level { type identityref { base vpn-common:isis-level; } description "Can be 'level-1', 'level-2', or 'level-1-2'."; reference "RFC 9181: A Common YANG Data Model for Layer 2 and Layer 3 VPNs"; } leaf metric { type uint16; description "Metric of the PE-CE link. It is used in the routing state calculation and path selection."; } leaf mode { type enumeration { enum active { description Boucadair, et al. Expires 2 June 2024 [Page 71] Internet-Draft A YANG Network Model for ACs November 2023 "The interface sends or receives IS-IS protocol control packets."; } enum passive { description "Suppresses the sending of IS-IS updates through the specified interface."; } } description "IS-IS interface mode type."; } uses ac-common:isis-authentication; uses vpn-common:service-status; } container rip { when "derived-from-or-self(../type, " + "'vpn-common:rip-routing')" { description "Only applies when the protocol is RIP. For IPv4, the model assumes that RIP version 2 is used."; } description "Configuration specific to RIP routing."; uses rip-base; uses ac-common:rip-authentication; uses vpn-common:service-status; } container vrrp { when "derived-from-or-self(../type, " + "'vpn-common:vrrp-routing')" { description "Only applies when the protocol is the VRRP."; } description "Configuration specific to VRRP."; reference "RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6"; leaf address-family { type identityref { base vpn-common:address-family; } description "Indicates whether IPv4, IPv6, or both address families are to be enabled."; Boucadair, et al. Expires 2 June 2024 [Page 72] Internet-Draft A YANG Network Model for ACs November 2023 } leaf vrrp-group { type uint8 { range "1..255"; } description "Includes the VRRP group identifier."; } leaf backup-peer { type inet:ip-address; description "Indicates the IP address of the peer."; } leaf-list virtual-ip-address { type inet:ip-address; description "Virtual IP addresses for a single VRRP group."; reference "RFC 5798: Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6, Sections 1.2 and 1.3"; } leaf priority { type uint8 { range "1..254"; } description "Sets the local priority of the VRRP speaker."; } leaf ping-reply { type boolean; description "Controls whether the VRRP speaker should reply to ping requests."; } uses vpn-common:service-status; } } } // OAM grouping bfd { description "Grouping for BFD."; leaf session-type { type identityref { Boucadair, et al. Expires 2 June 2024 [Page 73] Internet-Draft A YANG Network Model for ACs November 2023 base vpn-common:bfd-session-type; } description "Specifies the BFD session type."; } leaf desired-min-tx-interval { type uint32; units "microseconds"; description "The minimum interval between transmissions of BFD Control packets, as desired by the operator."; reference "RFC 5880: Bidirectional Forwarding Detection (BFD), Section 6.8.7"; } leaf required-min-rx-interval { type uint32; units "microseconds"; description "The minimum interval between received BFD Control packets that the PE should support."; reference "RFC 5880: Bidirectional Forwarding Detection (BFD), Section 6.8.7"; } leaf local-multiplier { type uint8 { range "1..255"; } description "Specifies the detection multiplier that is transmitted to a BFD peer. The detection interval for the receiving BFD peer is calculated by multiplying the value of the negotiated transmission interval by the received detection multiplier value."; reference "RFC 5880: Bidirectional Forwarding Detection (BFD), Section 6.8.7"; } leaf holdtime { type uint32; units "milliseconds"; description "Expected BFD holdtime. The customer may impose some fixed values for the holdtime Boucadair, et al. Expires 2 June 2024 [Page 74] Internet-Draft A YANG Network Model for ACs November 2023 period if the provider allows the customer to use this function."; reference "RFC 5880: Bidirectional Forwarding Detection (BFD), Section 6.8.18"; } } // OAM grouping oam { description "Defines the Operations, Administration, and Maintenance (OAM) mechanisms used."; container bfd { description "Container for BFD."; leaf profile { type bfd-profile-reference; description "Well-known service provider profile name."; } uses bfd; container authentication { presence "Enables BFD authentication"; description "Parameters for BFD authentication."; leaf key-chain { type key-chain:key-chain-ref; description "Name of the key chain."; } leaf meticulous { type boolean; description "Enables meticulous mode."; reference "RFC 5880: Bidirectional Forwarding Detection (BFD), Section 6.7"; } } uses vpn-common:service-status; } } // security grouping security { Boucadair, et al. Expires 2 June 2024 [Page 75] Internet-Draft A YANG Network Model for ACs November 2023 description "Security parameters for an AC."; container encryption { if-feature "vpn-common:encryption"; description "Container for AC encryption."; leaf enabled { type boolean; description "If set to 'true', traffic encryption on the connection is required. Otherwise, it is disabled."; } leaf layer { when "../enabled = 'true'" { description "Included only when encryption is enabled."; } type enumeration { enum layer2 { description "Encryption occurs at Layer 2."; } enum layer3 { description "Encryption occurs at Layer 3. For example, IPsec may be used when a customer requests Layer 3 encryption."; } } description "Indicates the layer on which encryption is applied."; } } container encryption-profile { when "../encryption/enabled = 'true'" { description "Indicates the layer on which encryption is enabled."; } description "Container for the encryption profile."; choice profile { description "Choice for the encryption profile."; case provider-profile { leaf profile-name { type encryption-profile-reference; description "Name of the provider's profile to be applied."; Boucadair, et al. Expires 2 June 2024 [Page 76] Internet-Draft A YANG Network Model for ACs November 2023 } } case customer-profile { leaf customer-key-chain { type key-chain:key-chain-ref; description "Customer-supplied key chain."; } } } } } // AC profile grouping ac-profile { description "Grouping for attachment circuit profiles."; container l2-connection { description "Defines Layer 2 protocols and parameters that are required to enable AC connectivity."; //uses l2-connection; } container ip-connection { description "Defines IP connection parameters."; //uses l3-connection; } container routing-protocols { description "Defines routing protocols."; uses routing-profile; } container oam { description "Defines the OAM mechanisms used for the AC profile."; container bfd { if-feature "vpn-common:bfd"; description "Container for BFD."; uses bfd; } } } //AC network provisioning Boucadair, et al. Expires 2 June 2024 [Page 77] Internet-Draft A YANG Network Model for ACs November 2023 grouping ac { description "Grouping for attachment circuits."; leaf description { type string; description "Associates a description with an AC."; } container l2-connection { description "Defines Layer 2 protocols and parameters that are required to enable AC connectivity."; uses l2-connection-if-ref; } container ip-connection { description "Defines IP connection parameters."; uses ip-connection; } container routing-protocols { description "Defines routing protocols."; uses routing; } container oam { description "Defines the OAM mechanisms used for the AC."; uses oam; } container security { description "AC-specific security parameters."; uses security; } container service { description "AC-specific bandwith parameters."; leaf mtu { type uint32; units "bytes"; description "Layer 2 MTU."; } uses ac-svc:bandwidth; container qos { if-feature "vpn-common:qos"; description "QoS configuration."; Boucadair, et al. Expires 2 June 2024 [Page 78] Internet-Draft A YANG Network Model for ACs November 2023 container qos-profiles { description "QoS profile configuration."; list qos-profile { key "profile"; description "Points to a QoS profile."; leaf profile { type qos-profile-reference; description "QoS profile to be used."; } leaf direction { type identityref { base vpn-common:qos-profile-direction; } description "The direction to which the QoS profile is applied."; } } } } container access-control-list { description "Container for the Access Control List (ACL)."; container acl-profiles { description "ACL profile configuration."; list acl-profile { key "profile"; description "Points to an ACL profile."; leaf profile { type forwarding-profile-reference; description "Forwarding profile to be used."; } } } } } } augment "/nw:networks/nw:network" { description "Add a list of profiles."; container specific-provisioning-profiles { Boucadair, et al. Expires 2 June 2024 [Page 79] Internet-Draft A YANG Network Model for ACs November 2023 description "Contains a set of valid profiles to reference in the AC activation."; uses ac-common:ac-profile-cfg; } list ac-profile { key "name"; description "Specifies a list of AC profiles."; leaf name { type string; description "Name of the AC."; } uses ac-ntw:ac-profile; } } augment "/nw:networks/nw:network/nw:node" + "/sap:service/sap:sap" { when '../../../nw:network-types/sap:sap-network' { description "Augmentation parameters apply only for SAP networks."; } description "Augments SAPs with AC provisioning details."; list ac { key "name"; description "List of ACs."; leaf name { type string; description "A name that identifies the AC locally."; } leaf ac-svc-ref { type ac-svc:attachment-circuit-reference; description "A reference to the AC as exposed at the service level."; } list ac-profile { key "profile-id"; description "List of AC profiles."; leaf profile-id { type ac-profile-reference; description "A reference to an AC profile."; Boucadair, et al. Expires 2 June 2024 [Page 80] Internet-Draft A YANG Network Model for ACs November 2023 } } leaf ac-parent-ref { type ac-ntw:attachment-circuit-reference; description "Specifies the parent AC that is inherited by an AC. Parent ACs are used, e.g., in contexts where multiple CEs are terminating the same AC, but some specific information is required for each peer SAP."; } leaf-list peer-sap-id { type string; description "One or more peer SAPs can be indicated."; } list group { key "group-id"; description "List of group-ids."; leaf group-id { type string; description "Indicates the group-id to which the AC belongs."; } leaf precedence { type identityref { base ac-common:precedence-type; } description "Defines redundancy of an AC."; } } uses vpn-common:service-status; uses ac-ntw:ac; } } } 6. Security Considerations The YANG module specified in this document defines a schema for data that is designed to be accessed via network management protocols such as NETCONF [RFC6241] or RESTCONF [RFC8040]. 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 [RFC8446]. Boucadair, et al. Expires 2 June 2024 [Page 81] Internet-Draft A YANG Network Model for ACs November 2023 The Network Configuration Access Control Model (NACM) [RFC8341] 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) and delete operations to these data nodes without proper protection or authentication can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/ vulnerability in the "ietf-ac-ntw" module: 'specific-provisioning-profiles': This container includes a set of sensitive data that influence how an AC is delivered. For example, an attacker who has access to these data nodes may be able to manipulate routing policies, QoS policies, or encryption properties. These data nodes are defined with "nacm:default-deny- write" tagging [I-D.ietf-opsawg-teas-common-ac]. 'ac': An attacker who is able to access network nodes can undertake various attacks, such as modify the attributes of an AC (e.g., QoS, bandwidth, routing protocols, keying material), leading to malfunctioning of services that are delivered over that AC and therefore to Service Level Agreement (SLA) violations. In addition, an attacker could attempt to add a new AC. : In addition to using NACM to prevent unauthorized access, such activity can be detected by adequately monitoring and tracking network configuration changes. Some of the readable data nodes in this YANG module may be considered sensitive or vulnerable in some network environments. It is thus 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 in the "ietf-ac-svc" module: 'ac': Unauthorized access to this subtree can disclose the identity of a customer 'peer-sap-id'. 'l2-connection' and 'ip-connection': An attacker can retrieve privacy-related information, which can be used to track a customer. Disclosing such information may be considered a violation of the customer-provider trust relationship. 'keying-material': An attacker can retrieve the cryptographic keys Boucadair, et al. Expires 2 June 2024 [Page 82] Internet-Draft A YANG Network Model for ACs November 2023 protecting an AC (routing, in particular). These keys could be used to inject spoofed routing advertisements. Several data nodes ('bgp', 'ospf', 'isis', and 'rip') rely upon [RFC8177] for authentication purposes. As such, the AC network module inherits the security considerations discussed in Section 5 of [RFC8177]. Also, these data nodes support supplying explicit keys as strings in ASCII format. The use of keys in hexadecimal string format would afford greater key entropy with the same number of key- string octets. However, such a format is not included in this version of the AC network model, because it is not supported by the underlying device modules (e.g., [RFC8695]). 7. IANA Considerations IANA is requested to register the following URI in the "ns" subregistry within the "IETF XML Registry" [RFC3688]: URI: urn:ietf:params:xml:ns:yang:ietf-ac-ntw Registrant Contact: The IESG. XML: N/A; the requested URI is an XML namespace. IANA is requested to register the following YANG module in the "YANG Module Names" subregistry [RFC6020] within the "YANG Parameters" registry: Name: ietf-ac-ntw Namespace: urn:ietf:params:xml:ns:yang:ietf-ac-ntw Prefix: ac-ntw Maintained by IANA? N Reference: RFC XXXX 8. References 8.1. Normative References [I-D.ietf-opsawg-teas-attachment-circuit] Boucadair, M., Roberts, R., de Dios, O. G., Barguil, S., and B. Wu, "YANG Data Models for 'Attachment Circuits'-as- a-Service (ACaaS)", Work in Progress, Internet-Draft, draft-ietf-opsawg-teas-attachment-circuit-02, 27 November 2023, . [I-D.ietf-opsawg-teas-common-ac] Boucadair, M., Roberts, R., de Dios, O. G., Barguil, S., and B. Wu, "A Common YANG Data Model for Attachment Circuits", Work in Progress, Internet-Draft, draft-ietf- Boucadair, et al. Expires 2 June 2024 [Page 83] Internet-Draft A YANG Network Model for ACs November 2023 opsawg-teas-common-ac-02, 28 November 2023, . [IEEE802.1Qcp] IEEE, "IEEE Standard for Local and metropolitan area networks--Bridges and Bridged Networks--Amendment 30: YANG Data Model", September 2018, . [RFC2080] Malkin, G. and R. Minnear, "RIPng for IPv6", RFC 2080, DOI 10.17487/RFC2080, January 1997, . [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC2453] Malkin, G., "RIP Version 2", STD 56, RFC 2453, DOI 10.17487/RFC2453, November 1998, . [RFC3688] Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, January 2004, . [RFC4271] Rekhter, Y., Ed., Li, T., Ed., and S. Hares, Ed., "A Border Gateway Protocol 4 (BGP-4)", RFC 4271, DOI 10.17487/RFC4271, January 2006, . [RFC4364] Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February 2006, . [RFC4552] Gupta, M. and N. Melam, "Authentication/Confidentiality for OSPFv3", RFC 4552, DOI 10.17487/RFC4552, June 2006, . [RFC4577] Rosen, E., Psenak, P., and P. Pillay-Esnault, "OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4577, DOI 10.17487/RFC4577, June 2006, . [RFC5701] Rekhter, Y., "IPv6 Address Specific BGP Extended Community Attribute", RFC 5701, DOI 10.17487/RFC5701, November 2009, . Boucadair, et al. Expires 2 June 2024 [Page 84] Internet-Draft A YANG Network Model for ACs November 2023 [RFC5709] Bhatia, M., Manral, V., Fanto, M., White, R., Barnes, M., Li, T., and R. Atkinson, "OSPFv2 HMAC-SHA Cryptographic Authentication", RFC 5709, DOI 10.17487/RFC5709, October 2009, . [RFC5798] Nadas, S., Ed., "Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6", RFC 5798, DOI 10.17487/RFC5798, March 2010, . [RFC5880] Katz, D. and D. Ward, "Bidirectional Forwarding Detection (BFD)", RFC 5880, DOI 10.17487/RFC5880, June 2010, . [RFC5925] Touch, J., Mankin, A., and R. Bonica, "The TCP Authentication Option", RFC 5925, DOI 10.17487/RFC5925, June 2010, . [RFC6020] Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, October 2010, . [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, . [RFC6242] Wasserman, M., "Using the NETCONF Protocol over Secure Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011, . [RFC6565] Pillay-Esnault, P., Moyer, P., Doyle, J., Ertekin, E., and M. Lundberg, "OSPFv3 as a Provider Edge to Customer Edge (PE-CE) Routing Protocol", RFC 6565, DOI 10.17487/RFC6565, June 2012, . [RFC6991] Schoenwaelder, J., Ed., "Common YANG Data Types", RFC 6991, DOI 10.17487/RFC6991, July 2013, . [RFC7166] Bhatia, M., Manral, V., and A. Lindem, "Supporting Authentication Trailer for OSPFv3", RFC 7166, DOI 10.17487/RFC7166, March 2014, . Boucadair, et al. Expires 2 June 2024 [Page 85] Internet-Draft A YANG Network Model for ACs November 2023 [RFC7474] Bhatia, M., Hartman, S., Zhang, D., and A. Lindem, Ed., "Security Extension for OSPFv2 When Using Manual Key Management", RFC 7474, DOI 10.17487/RFC7474, April 2015, . [RFC8040] Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017, . [RFC8077] Martini, L., Ed. and G. Heron, Ed., "Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)", STD 84, RFC 8077, DOI 10.17487/RFC8077, February 2017, . [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, . [RFC8177] Lindem, A., Ed., Qu, Y., Yeung, D., Chen, I., and J. Zhang, "YANG Data Model for Key Chains", RFC 8177, DOI 10.17487/RFC8177, June 2017, . [RFC8294] Liu, X., Qu, Y., Lindem, A., Hopps, C., and L. Berger, "Common YANG Data Types for the Routing Area", RFC 8294, DOI 10.17487/RFC8294, December 2017, . [RFC8341] Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", STD 91, RFC 8341, DOI 10.17487/RFC8341, March 2018, . [RFC8342] Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, March 2018, . [RFC8343] Bjorklund, M., "A YANG Data Model for Interface Management", RFC 8343, DOI 10.17487/RFC8343, March 2018, . [RFC8446] Rescorla, E., "The Transport Layer Security (TLS) Protocol Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018, . Boucadair, et al. Expires 2 June 2024 [Page 86] Internet-Draft A YANG Network Model for ACs November 2023 [RFC9067] Qu, Y., Tantsura, J., Lindem, A., and X. Liu, "A YANG Data Model for Routing Policy", RFC 9067, DOI 10.17487/RFC9067, October 2021, . [RFC9181] Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M., Ed., and Q. Wu, "A Common YANG Data Model for Layer 2 and Layer 3 VPNs", RFC 9181, DOI 10.17487/RFC9181, February 2022, . [RFC9182] Barguil, S., Gonzalez de Dios, O., Ed., Boucadair, M., Ed., Munoz, L., and A. Aguado, "A YANG Network Data Model for Layer 3 VPNs", RFC 9182, DOI 10.17487/RFC9182, February 2022, . [RFC9291] Boucadair, M., Ed., Gonzalez de Dios, O., Ed., Barguil, S., and L. Munoz, "A YANG Network Data Model for Layer 2 VPNs", RFC 9291, DOI 10.17487/RFC9291, September 2022, . [RFC9408] Boucadair, M., Ed., Gonzalez de Dios, O., Barguil, S., Wu, Q., and V. Lopez, "A YANG Network Data Model for Service Attachment Points (SAPs)", RFC 9408, DOI 10.17487/RFC9408, June 2023, . 8.2. Informative References [AC-Ntw-Tree] "Full Network Attachment Circuit Tree Structure", 2023, . [PYANG] "pyang", 2023, . [RFC3644] Snir, Y., Ramberg, Y., Strassner, J., Cohen, R., and B. Moore, "Policy Quality of Service (QoS) Information Model", RFC 3644, DOI 10.17487/RFC3644, November 2003, . [RFC4862] Thomson, S., Narten, T., and T. Jinmei, "IPv6 Stateless Address Autoconfiguration", RFC 4862, DOI 10.17487/RFC4862, September 2007, . [RFC7665] Halpern, J., Ed. and C. Pignataro, Ed., "Service Function Chaining (SFC) Architecture", RFC 7665, DOI 10.17487/RFC7665, October 2015, . Boucadair, et al. Expires 2 June 2024 [Page 87] Internet-Draft A YANG Network Model for ACs November 2023 [RFC7880] Pignataro, C., Ward, D., Akiya, N., Bhatia, M., and S. Pallagatti, "Seamless Bidirectional Forwarding Detection (S-BFD)", RFC 7880, DOI 10.17487/RFC7880, July 2016, . [RFC8340] Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018, . [RFC8695] Liu, X., Sarda, P., and V. Choudhary, "A YANG Data Model for the Routing Information Protocol (RIP)", RFC 8695, DOI 10.17487/RFC8695, February 2020, . [RFC8969] Wu, Q., Ed., Boucadair, M., Ed., Lopez, D., Xie, C., and L. Geng, "A Framework for Automating Service and Network Management with YANG", RFC 8969, DOI 10.17487/RFC8969, January 2021, . Appendix A. Examples A.1. VPLS Let's consider the example depicted in Figure 17 with two customer terminating points (CE1 and CE2). Let's also assume that the bearers to attach these CEs to the provider network are already in place. References to the identify these bearers are shown in the figure. .-----. .--------------. .-----. .----. | PE1 +===+ +===+ PE2 | .----. | CE1+------+"450"| | MPLS | |"451"+------+ CE2| '----' ^ '-----' | | '-----' ^ '----' | | Core | | Bearer:1234 '--------------' Bearer:5678 Figure 17: Topology Example The AC service model [I-D.ietf-opsawg-teas-attachment-circuit] can be used by the provider to manage and expose the ACs over existing bearers as shown in Figure 18. { "ietf-ac-svc:attachment-circuits":{ "ac-group-profile":[ { "name":"an-ac-profile", "l2-connection":{ "encapsulation":{ Boucadair, et al. Expires 2 June 2024 [Page 88] Internet-Draft A YANG Network Model for ACs November 2023 "encap-type":"ietf-vpn-common:dot1q", "dot1q":{ "tag-type":"ietf-vpn-common:c-vlan", "cvlan-id":550 } } }, "service":{ "mtu":1550, "svc-pe-to-ce-bandwidth":{ "pe-to-ce-bandwidth":[ { "bw-type":"ietf-vpn-common:bw-per-port", "cir":"20480000" } ] }, "svc-ce-to-pe-bandwidth":{ "ce-to-pe-bandwidth":[ { "bw-type":"ietf-vpn-common:bw-per-port", "cir":"20480000" } ] }, "qos":{ "qos-profile":{ "qos-profile":[ { "profile":"QoS_Profile_A", "direction":"ietf-vpn-common:both" } ] } } } } ], "ac":[ { "name":"ac-1", "description":"First attachment", "ac-group-profile":["an-ac-profile"], "l2-connection":{ "bearer-reference":"1234" } }, { Boucadair, et al. Expires 2 June 2024 [Page 89] Internet-Draft A YANG Network Model for ACs November 2023 "name":"ac-2", "description":"Second attachment", "ac-group-profile": ["an-ac-profile"], "l2-connection":{ "bearer-reference":"5678" } } ] } } Figure 18: ACs Created Using ACaaS The provisionned AC at PE1 can be retrieved using the AC network model as depicted in Figure 19. A similar query can be used for the AC at PE2. =============== NOTE: '\' line wrapping per RFC 8792 ================ { "ietf-sap-ntw:service":[ { "service-type":"ietf-vpn-common:vpls", "sap":[ { "sap-id":"sap#1", "peer-sap-id":[ "ce-1" ], "description":"A parent SAP", "attachment-interface":"GE0/6/1", "interface-type":"ietf-sap-ntw:phy", "role":"ietf-sap-ntw:uni", "allows-child-saps":true, "sap-status":{ "status":"ietf-vpn-common:op-up" } }, { "sap-id":"sap#11", "description":"A child SAP", "parent-termination-point":"GE0/6/4", "attachment-interface":"GE0/6/4.2", "interface-type":"ietf-sap-ntw:logical", "encapsulation-type":"ietf-vpn-common:vlan-type", "sap-status":{ "status":"ietf-vpn-common:op-up" }, Boucadair, et al. Expires 2 June 2024 [Page 90] Internet-Draft A YANG Network Model for ACs November 2023 "ietf-ac-ntw:ac":[ { "name":"ac-11", "ac-svc-ref":"ac-1", "peer-sap-id":[ "ce-1" ], "status":{ "admin-status":{ "status":"ietf-vpn-common:admin-up" }, "oper-status":{ "status":"ietf-vpn-common:op-up" } }, "l2-connection":{ "encapsulation":{ "encap-type":"ietf-vpn-common:dot1q", "dot1q":{ "tag-type":"ietf-vpn-common:c-vlan", "cvlan-id":550 } }, "bearer-reference":"1234" }, "service":{ "mtu":1550, "svc-pe-to-ce-bandwidth":{ "pe-to-ce-bandwidth":[ { "cir":"20480000" } ] }, "svc-ce-to-pe-bandwidth":{ "ce-to-pe-bandwidth":[ { "cir":"20480000" } ] }, "qos":{ "qos-profile":{ "qos-profile":[ { "profile":"QoS_Profile_A", "direction":"ietf-vpn-common:\ both" Boucadair, et al. Expires 2 June 2024 [Page 91] Internet-Draft A YANG Network Model for ACs November 2023 } ] } } } } ] } ] } ] } Figure 19: Example of AC Network Response (Message Body) A.2. Parent AC In reference to the topology depicted in Figure 1, PE2 has a SAP which terminates an AC with two peer SAPs (CE2 and CE5). In order to control data that is specific to each of these peer SAPs over the same AC, child ACs can be instantiated as depicted in Figure 20. { "ietf-sap-ntw:service":[ { "service-type":"ietf-vpn-common:l3vpn", "sap":[ { "sap-id":"sap#14587", "description":"A SAP", "parent-termination-point":"GE0/6/4", "attachment-interface":"GE0/6/4.2", "interface-type":"ietf-sap-ntw:logical", "encapsulation-type":"ietf-vpn-common:vlan-type", "sap-status":{ "status":"ietf-vpn-common:op-up" }, "ietf-ac-ntw:ac":[ { "name":"ac-1", "peer-sap-id":[ "CE2", "CE5" ], "status":{ "admin-status":{ "status":"ietf-vpn-common:admin-up" }, Boucadair, et al. Expires 2 June 2024 [Page 92] Internet-Draft A YANG Network Model for ACs November 2023 "oper-status":{ "status":"ietf-vpn-common:op-up" } }, "l2-connection":{ "encapsulation":{ "encap-type":"ietf-vpn-common:dot1q", "dot1q":{ "tag-type":"ietf-vpn-common:c-vlan", "cvlan-id":550 } }, "bearer-reference":"1234" } }, { "name":"ac-1-to-ce2", "ac-parent-ref":"ac-1", "peer-sap-id":[ "CE2" ] }, { "name":"ac-1-to-ce5", "ac-parent-ref":"ac-1", "peer-sap-id":[ "CE5" ] } ] } ] } ] } Figure 20: Example of Child ACs Acknowledgments This document builds on [RFC9182] and [RFC9291]. Thanks to Moti Morgenstern for the review and comments. Contributors Victor Lopez Nokia Boucadair, et al. Expires 2 June 2024 [Page 93] Internet-Draft A YANG Network Model for ACs November 2023 Email: victor.lopez@nokia.com Ivan Bykov Ribbon Communications Email: Ivan.Bykov@rbbn.com Qin Wu Huawei Email: bill.wu@huawei.com Ogaki Kenichi KDDI Email: ke-oogaki@kddi.com Luis Angel Munoz Vodafone Email: luis-angel.munoz@vodafone.com Authors' Addresses Mohamed Boucadair (editor) Orange Email: mohamed.boucadair@orange.com Richard Roberts Juniper Email: rroberts@juniper.net Oscar Gonzalez de Dios Telefonica Email: oscar.gonzalezdedios@telefonica.com Samier Barguil Giraldo Nokia Email: samier.barguil_giraldo@nokia.com Bo Wu Huawei Technologies Email: lana.wubo@huawei.com Boucadair, et al. Expires 2 June 2024 [Page 94]