BESS Working Group D. Jain Internet-Draft K. Patel Intended status: Standards Track P. Brissette Expires: March 17, 2017 Cisco Z. Li S. Zhuang Huawei Technologies X. Liu Ericsson J. Haas S. Esale Juniper Networks B. Wen Comcast September 13, 2016 Yang Data Model for BGP/MPLS L3 VPNs draft-ietf-bess-l3vpn-yang-00.txt Abstract This document defines a YANG data model that can be used to configure and manage BGP Layer 3 VPNs. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://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 March 17, 2017. Copyright Notice Copyright (c) 2016 IETF Trust and the persons identified as the document authors. All rights reserved. Jain, et al. Expires March 17, 2017 [Page 1] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1. Requirements Language . . . . . . . . . . . . . . . . . . 3 2. Definitions and Acronyms . . . . . . . . . . . . . . . . . . 3 3. Design of BGP L3VPN Data Model . . . . . . . . . . . . . . . 4 3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 4 3.2. VRF Specific Configuration . . . . . . . . . . . . . . . 4 3.2.1. VRF interface . . . . . . . . . . . . . . . . . . . . 4 3.2.2. Route distinguisher . . . . . . . . . . . . . . . . . 4 3.2.3. Import and export route targets . . . . . . . . . . . 5 3.2.4. Forwarding mode . . . . . . . . . . . . . . . . . . . 5 3.2.5. Label security . . . . . . . . . . . . . . . . . . . 5 3.2.6. Yang tree . . . . . . . . . . . . . . . . . . . . . . 5 3.3. BGP Specific Configuration . . . . . . . . . . . . . . . 7 3.3.1. VPN peering . . . . . . . . . . . . . . . . . . . . . 7 3.3.2. VPN prefix limits . . . . . . . . . . . . . . . . . . 7 3.3.3. Label Mode . . . . . . . . . . . . . . . . . . . . . 8 3.3.4. ASBR options . . . . . . . . . . . . . . . . . . . . 8 3.3.5. Yang tree . . . . . . . . . . . . . . . . . . . . . . 8 4. BGP Yang Module . . . . . . . . . . . . . . . . . . . . . . . 10 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 25 6. Security Considerations . . . . . . . . . . . . . . . . . . . 25 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 25 8. References . . . . . . . . . . . . . . . . . . . . . . . . . 26 8.1. Normative References . . . . . . . . . . . . . . . . . . 26 Jain, et al. Expires March 17, 2017 [Page 2] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 8.2. Informative References . . . . . . . . . . . . . . . . . 26 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 27 1. Introduction YANG [RFC6020] is a data definition language that was introduced to define the contents of a conceptual data store that allows networked devices to be managed using NETCONF [RFC6241]. YANG is proving relevant beyond its initial confines, as bindings to other interfaces (e.g. ReST) and encodings other than XML (e.g. JSON) are being defined. Furthermore, YANG data models can be used as the basis of implementation for other interfaces, such as CLI and programmatic APIs. This document defines a YANG model that can be used to configure and manage BGP L3VPNs [RFC4364]. It contains VRF sepcific parameters as well as BGP specific parameters applicable for L3VPNs. The individual containers defined in this model contain control knobs for configuration for that purpose, as well as a few data nodes that can be used to monitor health and gather statistics. 1.1. Requirements Language The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119]. 2. Definitions and Acronyms AF: Address Family AS: Autonomous System ASBR: Autonomous System Border Router BGP: Border Gateway Protocol CE: Customer Edge PE: Provider Edge L3VPN: Layer 3 VPN NETCONF: Network Configuration Protocol RD: Route Distinguisher Jain, et al. Expires March 17, 2017 [Page 3] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 ReST: Representational State Transfer, a style of stateless interface and protocol that is generally carried over HTTP RTFilter: Route Filter VPN: Virtual Private Network VRF: Virtual Routing and Forwarding YANG: Data definition language for NETCONF 3. Design of BGP L3VPN Data Model 3.1. Overview There are two parts of the BGP L3VPN yang data model. The first part of the model defines VRF specific parameters for L3VPN by augmenting the network-instance container defined in the network instance model [I-D.ietf-rtgwg-ni-model] and the second part of the model defines BGP specific parameters for the L3VPN by augmenting the base BGP data model defined in [I-D.ietf-idr-bgp-model]. 3.2. VRF Specific Configuration IETF network instance model defines a base identity for network instance type as L3-VRF. For L3VPN, the VRF specific parameters are defined by augmenting the network-instance container corresponding to L3-VRF instance. A new container l3vpn is added for VPN parameters. 3.2.1. VRF interface To associate a VRF instance with an interface, the interface should be defined in the context of network instance representing a L3-VRF. This is covered in base network instance model [I-D.ietf-rtgwg-ni-model]. 3.2.2. Route distinguisher Route distinguisher (RD) is an unique identifier used in VPN routes to distinguish prefixes across different VPNs. RD is 8 byte field as defined in the [RFC4364]. Where the first two bytes refer to type followed by 6 bytes of value. The format of the value is dependent on type. In the yang model, RDs are defined l3vpn container under network-instance. Jain, et al. Expires March 17, 2017 [Page 4] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 3.2.3. Import and export route targets Route-target (RT) is an extended community used to specify the rules for importing and exporting the routes for each VRF as defined in [RFC4364]. This is applicable in the context of an address-family under the VRF. Under the l3vpn container, statements for import and export route-targets are added for ipv4 and ipv6 address family. Both import and export sets are modeled as a list of rout-targets. An import rule is modeled as list of RTs or a policy leafref specifying the list of RTs to be matched for importing routes into the VRF. Similarly an export rule is set or RTs or a policy leafref specifying the list of RTs which should be attached to routes exported from this VRF. In the case where policy is used to specify the RTs, a reference to the policy via leafref is used in this model, but actual definition of policy is outside the scope of this document. In addition, this section also defines parameters for the import from global routing table and export to global routing table, as well as route limit per VPN instance for ipv4 and ipv6 address family. 3.2.4. Forwarding mode This configuration augments interface list under interface container under a network instance as defined in IETF network instance model [I-D.ietf-rtgwg-ni-model]. Forwarding mode configuration is required under the ASBR facing interface to enable mpls forwarding for directly connected BGP peers for inter-as option B peering. 3.2.5. Label security For inter-as option-B peering across ASs, under the ASBR facing interface, mpls label security enables the checks for RPF label on incoming packets. Ietf-interface container is augmented to add this config. 3.2.6. Yang tree module: ietf-bgp-l3vpn augment /ni:network-instances/ni:network-instance: +--rw l3vpn +--rw route-distinguisher | +--rw config | | +--rw rd? string | +--ro state | +--ro rd? string +--rw ipv4 Jain, et al. Expires March 17, 2017 [Page 5] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 | +--rw unicast | +--rw route-targets | | +--rw config | | | +--rw rts* [rt] | | | | +--rw rt string | | | | +--rw rt-type? enumeration | | | +--rw route-policy? string | | +--ro state | | +--ro rts* [rt] | | | +--ro rt string | | | +--ro rt-type? enumeration | | +--ro route-policy? string | +--rw import-from-global | | +--rw config | | | +--rw enable? boolean | | | +--rw advertise-as-vpn? boolean | | | +--rw route-policy? string | | | +--rw bgp-valid-route? boolean | | | +--rw protocol? enumeration | | | +--rw instance? string | | +--ro state | | +--ro enable? boolean | | +--ro advertise-as-vpn? boolean | | +--ro route-policy? string | | +--ro bgp-valid-route? boolean | | +--ro protocol? enumeration | | +--ro instance? string | +--rw export-to-global | | +--rw config | | | +--rw enable? boolean | | +--ro state | | +--ro enable? boolean | +--rw routing-table-limit | | +--rw config | | | +--rw routing-table-limit-number? uint32 | | | +--rw (routing-table-limit-action)? | | | +--:(enable-alert-percent) | | | | +--rw alert-percent-value? uint8 | | | +--:(enable-simple-alert) | | | +--rw simple-alert? boolean | | +--ro state | | +--ro routing-table-limit-number? uint32 | | +--ro (routing-table-limit-action)? | | +--:(enable-alert-percent) | | | +--ro alert-percent-value? uint8 | | +--:(enable-simple-alert) | | +--ro simple-alert? boolean | +--rw tunnel-params Jain, et al. Expires March 17, 2017 [Page 6] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 | +--rw config | | +--rw tunnel-policy? string | +--ro state | +--ro tunnel-policy? string augment /if:interfaces/if:interface: +--rw forwarding-mode | +--rw config | | +--rw forwarding-mode? fwd-mode-type | +--ro state | +--ro forwarding-mode? fwd-mode-type +--rw mpls-label-security +--rw config | +--rw rpf? boolean +--ro state +--ro rpf? boolean 3.3. BGP Specific Configuration The BGP specific configuration for L3VPNs is defined by augmenting base BGP model [I-D.ietf-idr-bgp-model]. In particular, specific knobs are added under neighbor and address family containers to handle VPN routes and ASBR peering. 3.3.1. VPN peering For Peering between PE routers, specific VPN address family needs to be enabled under BGP container in the default routing-instance. Base BGP draft [I-D.ietf-idr-bgp-model] has l3vpn address family in the list of identity refs for AFs under global and neighbor modes. The same is augmented here for additional knobs. For peering with CE routers the VRF specific BGP configurations such as neighbors and address-family are covered in base BGP config, except that such configuration will be in the context of a VRF. The instance of BGP in this case would be a separate instance in the context of routing instance realizing a VRF. 3.3.2. VPN prefix limits Limits for max number of VPN prefixes for a PE router is defined in the context of VPN address family under BGP. This would be the total number of prefixes in VPN table per AF in the context of BGP protocol. Route table limit for ipv4 and ipv6 address family for each VPN instance is also defined under BGP. The total prefix limit Jain, et al. Expires March 17, 2017 [Page 7] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 per VPN, including all the protocols is defined in the context of VRF address family under routing instance. 3.3.3. Label Mode Label mode knobs control the label allocation behavior for VRF routes. Such as to specify Per-site, Per-vpn and Per-route label allocation. These knobs augment BGP global AF containers in the context of default routing instance. 3.3.4. ASBR options This includes few specific knobs for ASBR peering methods illustrated in [RFC4364]. Such as route target retention on ASBRs and rewrite next hop to self, for inter-as VPN peering across ASBRs with option-B method. Similarly next hop unchanged on ASBRs for option-C peering. Appropriate containers under BGP AF and NBR modes are augmented for these parameters. As a note, when a knob is applicable for neighbor, it is also defined under corresponding peer-group container. 3.3.5. Yang tree module: ietf-bgp-l3vpn augment /bgp:bgp/bgp:global/bgp:afi-safis /bgp:afi-safi/bgp:l3vpn-ipv4-unicast: +--rw retain-rts +--rw config | +--rw all? empty | +--rw route-policy? string +--ro state +--ro all? empty +--ro route-policy? string +--rw prefix-limit +--rw config | +--rw prefix-limit-number? uint32 | +--rw (prefix-limit-action)? | +--:(enable-alert-percent) | | +--rw alert-percent-value? uint8 | | +--rw route-unchanged? boolean | +--:(enable-simple-alert) | +--rw simple-alert? boolean +--ro state +--ro prefix-limit-number? uint32 +--ro (prefix-limit-action)? +--:(enable-alert-percent) | +--ro alert-percent-value? uint8 | +--ro route-unchanged? boolean Jain, et al. Expires March 17, 2017 [Page 8] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 +--:(enable-simple-alert) +--ro simple-alert? boolean ... augment /bgp:bgp/bgp:global/bgp:afi-safis /bgp:afi-safi/bgp:ipv4-unicast: +--rw config | +--rw label-mode? bgp-label-mode +--ro state +--ro label-mode? bgp-label-mode +--rw routing-table-limit +--rw config | +--rw routing-table-limit-number? uint32 | +--rw (routing-table-limit-action)? | +--:(enable-alert-percent) | | +--rw alert-percent-value? uint8 | +--:(enable-simple-alert) | +--rw simple-alert? boolean +--ro state +--ro routing-table-limit-number? uint32 +--ro (routing-table-limit-action)? +--:(enable-alert-percent) | +--ro alert-percent-value? uint8 +--:(enable-simple-alert) +--ro simple-alert? boolean ... augment /bgp:bgp/bgp:neighbors/bgp:neighbor: +--rw nexthop-options +--rw config | +--rw next-hop-self? boolean | +--rw next-hop-unchanged? boolean +--rw state +--rw next-hop-self? boolean +--rw next-hop-unchanged? boolean augment /bgp:bgp/bgp:peer-groups/bgp:peer-group: +--rw nexthop-options +--rw config | +--rw next-hop-self? boolean | +--rw next-hop-unchanged? boolean +--rw state +--rw next-hop-self? boolean +--rw next-hop-unchanged? boolean augment /bgp:bgp/bgp:neighbors/bgp:neighbor /bgp:afi-safis/bgp:afi-safi: +--rw nexthop-options +--rw config Jain, et al. Expires March 17, 2017 [Page 9] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 | +--rw next-hop-self? boolean | +--rw next-hop-unchanged? boolean +--rw state +--rw next-hop-self? boolean +--rw next-hop-unchanged? boolean augment /bgp:bgp/bgp:peer-groups/bgp:peer-group /bgp:afi-safis/bgp:afi-safi: +--rw nexthop-options +--rw config | +--rw next-hop-self? boolean | +--rw next-hop-unchanged? boolean +--rw state +--rw next-hop-self? boolean +--rw next-hop-unchanged? boolean 4. BGP Yang Module file "ietf-bgp-l3vpn@2016-09-09.yang" module ietf-bgp-l3vpn { namespace "urn:ietf:params:xml:ns:yang:ietf-bgp-l3vpn"; // replace with IANA namespace when assigned prefix l3vpn ; import ietf-network-instance { prefix ni; revision-date 2016-06-23; } import ietf-interfaces { prefix if; } import ietf-bgp { prefix bgp; revision-date 2016-06-21; } organization "IETF BGP Enabled Services WG"; contact "BESS working group - bess@ietf.org"; Jain, et al. Expires March 17, 2017 [Page 10] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 description "This YANG module defines a YANG data model to configure and manage BGP Layer3 VPNs. It augments the IETF bgp yang model and IETF network instance model to add L3VPN specific configuration and operational knobs. Terms and Acronyms AF : Address Family AS : Autonomous System ASBR : Autonomous Systems Border Router BGP (bgp) : Border Gateway Protocol CE : Customer Edge IP (ip) : Internet Protocol IPv4 (ipv4):Internet Protocol Version 4 IPv6 (ipv6): Internet Protocol Version 6 L3VPN: Layer 3 VPN PE : Provider Edge RT : Route Target RD : Route Distinguisher VPN : Virtual Private Network VRF : Virtual Routing and Forwarding "; revision 2016-09-09 { description "Initial revision."; reference "RFC XXXX: A YANG Data Model for BGP L3VPN config management"; } //RD grouping route-distinguisher-params { Jain, et al. Expires March 17, 2017 [Page 11] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 description "BGP route distinguisher"; container route-distinguisher { description "Route distinguisher value as per RFC4364"; container config { description "Configuration parameters for route distinguisher"; leaf rd { type string; description "Route distinguisher value as per RFC4364"; } } container state { config "false" ; description "State information for route distinguisher"; leaf rd { type string; description "Route distinguisher value"; } } } } //Label mode typedef bgp-label-mode { type enumeration { enum per-ce { description "Allocate labels per CE"; } enum per-route { description "Allocate labels per prefix"; } enum per-vpn { description "Allocate labels per VRF"; } } description "BGP label allocation mode"; } //Fwding mode typedef fwd-mode-type { type enumeration { enum mpls { description "Forwarding mode mpls"; } } description "Enable forwarding mode under ASBR facing interface"; Jain, et al. Expires March 17, 2017 [Page 12] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 } grouping forwarding-mode { description "Forwarding mode of interface for ASBR scenario"; container forwarding-mode { description "Forwarding mode of interface for ASBR scenario"; container config { description "Configuration of Forwarding mode"; leaf forwarding-mode { type fwd-mode-type; description "Forwarding mode for this interface"; } } container state { config "false"; description "State information of Forwarding mode"; leaf forwarding-mode { type fwd-mode-type; description "Forwarding mode for this interface"; } } } } grouping label-security { description "Mpls label security for ASBR option B scenario"; container mpls-label-security { description "MPLS label secruity"; container config { description "Configuration parameters"; leaf rpf { type boolean; description "Enable MPLS label security rpf on interface"; } } container state { config "false"; description "State information"; leaf rpf { type boolean; description "MPLS label security rpf on interface"; } } } } //per VPN instance table limit under BGP Jain, et al. Expires March 17, 2017 [Page 13] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 grouping prefix-limit { description "The prefix limit command sets a limit on the maximum number of prefixes supported in the existing VPN instance, preventing the PE from importing excessive VPN route prefixes. "; leaf prefix-limit-number { type uint32 { range "1..4294967295"; } description "Specifies the maximum number of prefixes supported in the VPN instance IPv4 or IPv6 address family."; } choice prefix-limit-action { description "."; case enable-alert-percent { leaf alert-percent-value { type uint8 { range "1..100"; } description "Specifies the proportion of the alarm threshold to the maximum number of prefixes."; } leaf route-unchanged { type boolean; default "false"; description "Indicates that the routing table remains unchanged. By default, route-unchanged is not configured. When the number of prefixes in the routing table is greater than the value of the parameter number, routes are processed as follows: (1)If route-unchanged is configured, routes in the routing table remain unchanged. (2)If route-unchanged is not configured, all routes in the routing table are deleted and then re-added."; } } case enable-simple-alert { leaf simple-alert { type boolean; default "false"; Jain, et al. Expires March 17, 2017 [Page 14] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 description "Indicates that when the number of VPN route prefixes exceeds number, prefixes can still join the VPN routing table and alarms are displayed."; } } } } grouping vpn-pfx-limit { description "Per VPN instance table limit under BGP"; container vpn-prefix-limit { description "Prefix limit for this table"; container config { description "Config parameters"; uses prefix-limit; } container state { config "false"; description "State parameters"; uses prefix-limit; } } } grouping route-target-set { description "Extended community route-target set "; list rts { key "rt" ; description "List of route-targets" ; leaf rt { type string { pattern '([0-9]+:[0-9]+)'; } description "Route target extended community as per RFC4360"; } leaf rt-type { type enumeration { enum import { description "Route target is for import routes"; } enum export { description "Route target is for export routes"; } enum both { description Jain, et al. Expires March 17, 2017 [Page 15] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 "Route target is for both import and export routes"; } } description "Route target type"; } } leaf route-policy { type string; description "Reference to the policy containing set of routes. TBD: leafref to policy entry in IETF policy model"; } } grouping import-from-gbl { description "Import from global routing table"; leaf enable { type boolean; description "Enable"; } leaf advertise-as-vpn { type boolean; description "Advertise routes imported from global table as VPN routes"; } leaf route-policy { type string; description "Route policy as filter for importing routes"; } leaf bgp-valid-route { type boolean; description "Enable all valid routes (including non-best paths) to be candidate for import"; } leaf protocol { type enumeration { enum ALL { value "0"; description "ALL:"; } enum Direct { value "1"; description "Direct:"; } enum OSPF { Jain, et al. Expires March 17, 2017 [Page 16] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 value "2"; description "OSPF:"; } enum ISIS { value "3"; description "ISIS:"; } enum Static { value "4"; description "Static:"; } enum RIP { value "5"; description "RIP:"; } enum BGP { value "6"; description "BGP:"; } enum OSPFV3 { value "7"; description "OSPFV3:"; } enum RIPNG { value "8"; description "RIPNG:"; } } description "Specifies the protocol from which routes are imported. At present, In the IPv4 unicast address family view, the protocol can be IS-IS,static, direct and BGP."; } leaf instance { type string; description "Specifies the instance id of the protocol"; } } grouping global-imports { description "Grouping for imports from global routing table"; container import-from-global { description "Import from global routing table"; container config { description "Configuration"; uses import-from-gbl; } Jain, et al. Expires March 17, 2017 [Page 17] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 container state { config "false"; description "State"; uses import-from-gbl; } } } grouping export-to-gbl { description "Export routes to default VRF"; leaf enable { type boolean; description "Enable"; } } grouping global-exports { description "Grouping for exports routes to global table"; container export-to-global { description "Export to global routing table"; container config { description "Configuration"; uses export-to-gbl; } container state { config "false"; description "State"; uses export-to-gbl; } } } grouping route-target-params { description "Grouping to specify rules for route import and export"; container route-targets { description "Set of route-targets to match for import and export routes to/from VRF"; container config { description "Configuration of route targets"; uses route-target-set ; } container state { config "false" ; description "State information for route targets"; Jain, et al. Expires March 17, 2017 [Page 18] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 uses route-target-set ; } } } grouping route-tbl-limit-params { description "Grouping for VPN table prefix limit config"; leaf routing-table-limit-number { type uint32 { range "1..4294967295"; } description "Specifies the maximum number of routes supported by a VPN instance. "; } choice routing-table-limit-action { description "."; case enable-alert-percent { leaf alert-percent-value { type uint8 { range "1..100"; } description "Specifies the percentage of the maximum number of routes. When the maximum number of routes that join the VPN instance is up to the value (number*alert-percent)/100, the system prompts alarms. The VPN routes can be still added to the routing table, but after the number of routes reaches number, the subsequent routes are dropped."; } } case enable-simple-alert { leaf simple-alert { type boolean; description "Indicates that when VPN routes exceed number, routes can still be added into the routing table, but the system prompts alarms. However, after the total number of VPN routes and network public routes reaches the unicast route limit specified in the License, the subsequent VPN routes are dropped."; } } } Jain, et al. Expires March 17, 2017 [Page 19] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 } grouping routing-tbl-limit { description "."; container routing-table-limit { description "The routing-table limit command sets a limit on the maximum number of routes that the IPv4 or IPv6 address family of a VPN instance can support. By default, there is no limit on the maximum number of routes that the IPv4 or IPv6 address family of a VPN instance can support, but the total number of private network and public network routes on a device cannot exceed the allowed maximum number of unicast routes."; container config { description "Config parameters"; uses route-tbl-limit-params; } container state { config "false"; description "State parameters"; uses route-tbl-limit-params; } } } // Tunnel policy parameters grouping tunnel-params { description "Tunnel parameters"; container tunnel-params { description "Tunnel config parameters"; container config { description "configuration parameters"; leaf tunnel-policy { type string; description "Tunnel policy name."; } } container state { config "false"; description "state parameters"; leaf tunnel-policy { type string; description "Tunnel policy name."; } } Jain, et al. Expires March 17, 2017 [Page 20] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 } } // Grouping for the L3vpn specific parameters under VRF // (network-instance) grouping l3vpn-vrf-params { description "Specify route filtering rules for import/export"; container ipv4 { description "Specify route filtering rules for import/export"; container unicast { description "Specify route filtering rules for import/export"; uses route-target-params; uses global-imports; uses global-exports; uses routing-tbl-limit; uses tunnel-params; } } container ipv6 { description "Ipv6 address family specific rules for import/export"; container unicast { description "Ipv6 unicast address family"; uses route-target-params; uses global-imports; uses global-exports; uses routing-tbl-limit; uses tunnel-params; } } } grouping bgp-label-mode { description "MPLS/VPN label allocation mode"; container config { description "Configuration parameters for label allocation mode"; leaf label-mode { type bgp-label-mode; description "Label allocation mode"; } } container state { config "false" ; description "State information for label allocation mode"; leaf label-mode { Jain, et al. Expires March 17, 2017 [Page 21] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 type bgp-label-mode; description "Label allocation mode"; } } } grouping retain-route-targets { description "Grouping for route target accept"; container retain-route-targets { description "Control route target acceptance behavior for ASBRs"; container config { description "Configuration parameters for retaining route targets"; leaf all { type empty; description "Disable filtering of all route-targets"; } leaf route-policy { type string; description "Filter routes as per filter policy name TBD: leafref to IETF routing policy model"; } } container state { config "false" ; description "State information for retaining route targets"; leaf all { type empty; description "Disable filtering of all route-targets"; } leaf route-policy { type string; description "Filter routes as per filter policy name"; } } } } grouping nexthop-opts { description "Next hop control options for inter-as route exchange"; leaf next-hop-self { type boolean; description "Set nexthop of the route to self when advertising routes"; } leaf next-hop-unchanged { type boolean; description "Enforce no nexthop change when advertising routes"; Jain, et al. Expires March 17, 2017 [Page 22] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 } } grouping asbr-nexthop-options { description "Nexthop parameters for inter-as VPN options "; container nexthop-options { description "Nexthop related options for inter-as options"; container config { description "Configuration parameters for nexthop options"; uses nexthop-opts; } container state { config "false"; description "State information for nexthop options" ; uses nexthop-opts; } } } // // VRF specific parameters. // RD and RTs and route import-export rules are added under // network instance container in network instance model, hence // per VRF scoped augment "/ni:network-instances/ni:network-instance" { description "Augment network instance for per VRF L3vpn parameters"; container l3vpn { //Enable this check once network instance model has //identify defined for VRF type //when "../type='rt:vrf-network-instance'" { // description // "This container is only valid for vrf routing instance."; //} description "Configuration of L3VPN specific parameters"; uses route-distinguisher-params; uses l3vpn-vrf-params ; } } // bgp mpls forwarding enable required for inter-as option AB. augment "/if:interfaces/if:interface" { description "BGP mpls forwarding mode configuration on interface for ASBR scenario"; uses forwarding-mode ; uses label-security; Jain, et al. Expires March 17, 2017 [Page 23] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 } // // BGP Specific Paramters // // // Retain route-target for inter-as option ASBR knob. // vpn prefix limits // vpnv4/vpnv6 address-family only. augment "/bgp:bgp/bgp:global/bgp:afi-safis/" + "bgp:afi-safi/bgp:l3vpn-ipv4-unicast" { description "Retain route targets for ASBR scenario"; uses retain-route-targets; uses vpn-pfx-limit; } augment "/bgp:bgp/bgp:global/bgp:afi-safis/" + "bgp:afi-safi/bgp:l3vpn-ipv6-unicast" { description "Retain route targets for ASBR scenario"; uses retain-route-targets; uses vpn-pfx-limit; } // Label allocation mode configuration. Certain AFs only. augment "/bgp:bgp/bgp:global/bgp:afi-safis/" + "bgp:afi-safi/bgp:ipv4-unicast" { description "Augment BGP global AF mode for label allocation mode configuration"; uses bgp-label-mode ; uses routing-tbl-limit; } augment "/bgp:bgp/bgp:global/bgp:afi-safis/" + "bgp:afi-safi/bgp:ipv6-unicast" { description "Augment BGP global AF mode for label allocation mode configuration"; uses bgp-label-mode ; uses routing-tbl-limit; } // Nexthop options for the inter-as ASBR peering. augment "/bgp:bgp/bgp:neighbors/bgp:neighbor" { description "Augment BGP NBR mode with nexthop options for inter-as ASBRs"; Jain, et al. Expires March 17, 2017 [Page 24] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 uses asbr-nexthop-options; } augment "/bgp:bgp/bgp:peer-groups/bgp:peer-group" { description "Augment BGP peer-group mode with nexthop options for inter-as ASBRs"; uses asbr-nexthop-options; } augment "/bgp:bgp/bgp:neighbors/bgp:neighbor/" + "bgp:afi-safis/bgp:afi-safi" { description "Augment BGP NBR AF mode with nexthop options for inter-as ASBRs"; uses asbr-nexthop-options; } augment "/bgp:bgp/bgp:peer-groups/bgp:peer-group/" + "bgp:afi-safis/bgp:afi-safi" { description "Augment BGP peer-group AF mode with nexthop options for inter-as ASBRs"; uses asbr-nexthop-options; } } 5. IANA Considerations 6. Security Considerations The transport protocol used for sending the BGP L3VPN data MUST support authentication and SHOULD support encryption. The data-model by itself does not create any security implications. This draft does not change any underlying security issues inherent in [I-D.ietf-rtgwg-ni-model] and [I-D.ietf-idr-bgp-model]. 7. Acknowledgements The authors would like to thank TBD for their detail reviews and comments. Jain, et al. Expires March 17, 2017 [Page 25] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 8. References 8.1. Normative References [I-D.ietf-idr-bgp-model] Shaikh, A., Shakir, R., Patel, K., Hares, S., D'Souza, K., Bansal, D., Clemm, A., Zhdankin, A., Jethanandani, M., and X. Liu, "BGP Model for Service Provider Networks", draft- ietf-idr-bgp-model-02 (work in progress), July 2016. [I-D.ietf-rtgwg-ni-model] Berger, L., Hopps, C., Lindem, A., and D. Bogdanovic, "Network Instance Model", draft-ietf-rtgwg-ni-model-00 (work in progress), June 2016. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC4364] Rosen, E. and Y. Rekhter, "BGP/MPLS IP Virtual Private Networks (VPNs)", RFC 4364, DOI 10.17487/RFC4364, February 2006, . [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, . 8.2. Informative References [RFC2547] Rosen, E. and Y. Rekhter, "BGP/MPLS VPNs", RFC 2547, DOI 10.17487/RFC2547, March 1999, . [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, . Jain, et al. Expires March 17, 2017 [Page 26] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 [RFC4760] Bates, T., Chandra, R., Katz, D., and Y. Rekhter, "Multiprotocol Extensions for BGP-4", RFC 4760, DOI 10.17487/RFC4760, January 2007, . Authors' Addresses Dhanendra Jain Cisco 170 W. Tasman Drive San Jose, CA 95134 USA Email: dhjain@cisco.com Keyur Patel Cisco 170 W. Tasman Drive San Jose, CA 95134 USA Email: keyur@arrcus.com Patrice Brissette Cisco 170 W. Tasman Drive San Jose, CA 95134 USA Email: pbrisset@cisco.com Zhenbin Li Huawei Technologies Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: lizhenbin@huawei.com Jain, et al. Expires March 17, 2017 [Page 27] Internet-Draft Yang Data Model for BGP/MPLS L3 VPNs September 2016 Shunwan Zhuang Huawei Technologies Huawei Bld., No.156 Beiqing Rd. Beijing 100095 China Email: zhuangshunwan@huawei.com Xufeng Liu Ericsson 1595 Spring Hill Road, Suite 500 Vienna, VA 22182 USA Email: xliu@kuatrotech.com Jeffrey Haas Juniper Networks Email: jhaas@juniper.net Santosh Esale Juniper Networks 1194 N. Mathilda Ave. Sunnyvale, CA 94089 US Email: sesale@juniper.net Bin Wen Comcast Email: Bin_Wen@cable.comcast.com Jain, et al. Expires March 17, 2017 [Page 28]