Internet-Draft YANG Data Model for OSPF SRv6 September 2023
Hu, et al. Expires 12 March 2024 [Page]
Workgroup:
Network Working Group
Internet-Draft:
draft-ietf-lsr-ospf-srv6-yang-04
Published:
Intended Status:
Standards Track
Expires:
Authors:
Z. Hu
Huawei Technologies
X. Geng
Huawei Technologies
K. Raza
Cisco Systems, Inc.
Y. Qu
Futurewei Technologies
A. Lindem

YANG Data Model for OSPF SRv6

Abstract

This document defines a YANG data model that can be used to configure and manage OSPFv3 Segment Routing over the IPv6 Data Plane.

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].

Status of This Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."

This Internet-Draft will expire on 12 March 2024.

1. Introduction

YANG [RFC7950] is a data definition language used 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 for implementation of other interfaces, such as CLI and programmatic APIs.

This document defines a YANG data model that can be used to configure and manage OSPFv3 SRv6 [I-D.ietf-lsr-ospfv3-srv6-extensions] and it is an augmentation to the OSPF YANG data model [RFC9129] .

2. Terminology and Notation

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 following terms are defined in [RFC8342]:

  • client
  • server
  • configuration
  • system state
  • operational state
  • intended configuration

The following terms are defined in [RFC7950]:

  • action
  • augment
  • container
  • container with presence
  • data model
  • data node
  • feature
  • leaf
  • list
  • mandatory node
  • module
  • schema tree
  • RPC (Remote Procedure Call) operation

2.1. Tree Diagrams

Tree diagrams used in this document follow the notation defined in [RFC8340].

2.2. Prefixes in Data Node Names

In this document, names of data nodes, actions, and other data model objects are often used without a prefix, as long as it is clear from the context in which YANG module each name is defined. Otherwise, names are prefixed using the standard prefix associated with the corresponding YANG module, as shown in Table 1.

+------------+-----------------------------+-----------------------+
| Prefix     |YANG Module                  |  Reference            |
+------------+-----------------------------+-----------------------+
|ospfv3-e-lsa| ietf-ospfv3-extended-lsa    | I-D.ietf-lsr-ospfv3   |
|            |                             | -extended-lsa-yang    |
|            |                             |                       |
| ospf       | ietf-ospf                   | [RFC9129]             |
|            |                             |                       |
| srv6       | ietf-srv6-base              | I-D.ietf-spring-srv6  |
|            |                             |  -yang                |
|            |                             |                       |
| sr         | ietf-segment-routing        | [RFC9020]             |
|            |                             |                       |
| rt         | ietf-routing                | [RFC8349]             |
|            |                             |                       |
| yang       | ietf-yang-types             | [RFC6991]             |
|            |                             |                       |
| inet       | ietf-inet-types             | [RFC6991]             |
+------------+-----------------------------+-----------------------+
Figure 1: Table 1: Prefixes and Corresponding YANG Modules

3. OSPFv3 SRv6 Configuration

This document defines a model for OSPFv3 SRv6 feature. It is an augmentation of the OSPF base model.

The OSPFv3 SRv6 YANG module requires support of OSPF base model [RFC9129] which defines basic OSPF configuration and state and support of OSPFv3 Extended LSAs model [I-D.ietf-lsr-ospfv3-extended-lsa-yang].

3.1. SRv6 Activation

Activation of OSPFv3 SRv6 is done by setting the "enable" leaf to true. This triggers advertisement of SRv6 extensions based on the configuration parameters that have been setup using the base SRv6 module [I-D.ietf-spring-srv6-yang].

3.2. Locator Setting

The SRv6 base module [I-D.ietf-spring-srv6-yang] defines locators. When OSPFv6 SRv6 is enabled, the specified locators are used unless it is enabled to use the default locator. The default locator can be set by using two leafs, i.e.,"default-locator" leaf, "locator-name" leaf.

3.3. IP Fast Reroute

Additional data object (in the OSPFv3 SRv6 model ) for fast reroute [RFC5286] is introduced by augmenting the fast-reroute container of the OSPF module. It brings the ability to activate ipv6 TI-LFA (topology independent LFA) [I-D.ietf-rtgwg-segment-routing-ti-lfa].

3.4. Micro-loop Avoidance

OSPFv3 SRv6 model augments OSPF module with the micro-loop-avoidance container, this container including the leaf "srv6-enable" brings the ability to activate SRv6 avoid-microloop.

4. YANG Module and Tree

4.1. OSPFv3 SRv6 Model Tree

The figure below describes the overall structure of the ospfv3-srv6 YANG module:

module: ietf-ospfv3-srv6
  augment /rt:routing/rt:control-plane-protocols
          /rt:control-plane-protocol/ospf:ospf:
     +--rw srv6
     |  +--rw enable?                 boolean
     |  +--rw default-locator?        boolean
     |  +--rw locator-name*    -> /rt:routing/srv6:srv6
     |                            /srv6:locators/srv6:locator/srv6:name
     |  +--rw persistent-end-x-sid?   boolean
     +--rw micro-loop-avoidance
        +--rw srv6-enable?            boolean
        +--rw srv6-rib-update-delay?  uint16
  augment /rt:routing/rt:control-plane-protocols
          /rt:control-plane-protocol/ospf:ospf
          /ospf:fast-reroute:
     +--rw srv6-ti-lfa {srv6-ti-lfa}?
        +--rw enable?   boolean
  augment /rt:routing/rt:control-plane-protocols
          /rt:control-plane-protocol/ospf:ospf
          /ospf:database/ospf:as-scope-lsa-type
          /ospf:as-scope-lsas/ospf:as-scope-lsa
          /ospf:version/ospf:ospfv3
          /ospf:ospfv3/ospf:body:
     +--ro srv6-locator
        +--ro srv6-locactor-tlv
           +--ro route-type?       identityref
           +--ro algorithm?        uint8
           +--ro locator-length?   uint8
           +--ro flags*            identityref
           +--ro metric?           uint32
           +--ro locator*          inet:ipv6-address-no-zone
           +--ro srv6-end-sid
              +--ro flags*                identityref
              +--ro endpoint-func
              |  +--ro flags*                     identityref
              |  +--ro endpoint-func?             identityref
              |  +--ro undefined-endpoint-func?   uint16
              +--ro sid?                  srv6-sid-value
              +--ro srv6-sid-structure
                 +--ro lb-length?    uint8
                 +--ro ln-length?    uint8
                 +--ro fun-length?   uint8
                 +--ro arg-length?   uint8
  augment /rt:routing
          /rt:control-plane-protocols/rt:control-plane-protocol
          /ospf:ospf/ospf:database
          /ospf:as-scope-lsa-type/ospf:as-scope-lsas
          /ospf:as-scope-lsa/ospf:version/ospf:ospfv3
          /ospf:ospfv3/ospf:body/ospf:router-information:
     +--ro srv6-capability
     |  +--ro flags*   identityref
     +--ro msd
        +--ro max-sl?        uint8
        +--ro max-end-pop?   uint8
        +--ro max-h_encap?   uint8
        +--ro max-end_d?     uint8
  augment /rt:routing/rt:control-plane-protocols
          /rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area
          /ospf:database/ospf:area-scope-lsa-type/ospf:area-scope-lsas
          /ospf:area-scope-lsa/ospf:version/ospf:ospfv3
          /ospf:ospfv3/ospf:body/ospfv3-e-lsa:e-router
          /ospfv3-e-lsa:e-router-tlvs
          /ospfv3-e-lsa:link-tlv:
     +--ro srv6-endx-sid
        +--ro endpoint-func
        |  +--ro flags?                     identityref
        |  +--ro endpoint-func?             identityref
        |  +--ro undefined-endpoint-func?   uint16
        +--ro flags?                identityref
        +--ro algorithm?            uint8
        +--ro weight?               uint8
        +--ro sid*                  srv6-sid-value
        +--ro neighbor-router-id?   yang:dotted-quad
        +--ro srv6-sid-structure
           +--ro lb-length?    uint8
           +--ro ln-length?    uint8
           +--ro fun-length?   uint8
           +--ro arg-length?   uint8

4.2. OSPFv3 SRv6 YANG Module

<CODE BEGINS> file "ietf-ospfv3-srv6@2023-09-09.yang"

module ietf-ospfv3-srv6 {
  yang-version 1.1;
  namespace "urn:ietf:params:xml:ns:"
          + "yang:ietf-ospfv3-srv6";
  prefix ospfv3-srv6;

  import ietf-yang-types {
    prefix "yang";
    reference
      "RFC 6991: Common YANG Data Types";
  }

  import ietf-routing {
    prefix "rt";
    reference
      "RFC 8349: A YANG Data Model for Routing
                 Management (NMDA Version)";
  }

  import ietf-ospfv3-extended-lsa {
    prefix "ospfv3-e-lsa";
  }

  import ietf-ospf {
    prefix "ospf";
    reference
      "RFC 9129: YANG Data Model for the OSPF Protocol";
  }

  import ietf-srv6-base {
    prefix "srv6";
  }

  import ietf-inet-types {
    prefix "inet";
    reference
         "RFC 6991: Common YANG Data Types";
  }

  import ietf-segment-routing {
    prefix "sr";
    reference
         "RFC 9020: YANG Data Model for Segment Routing";
  }

  organization
   "IETF LSR Working Group";

  contact
    "WG Web:   <https://datatracker.ietf.org/group/lsr/>
     WG List:  <mailto:lsr@ietf.org>

     Author:    Zhibo Hu
                <mailto:huzhibo@huawei.com>
     Author:    Xuesong Geng
                <mailto:gengxuesong@huawei.com>
     Author:    Kamran Raza
                <mailto:skraza@cisco.com>
     Author:    Yingzhen Qu
                <mailto:yingzhen.qu@futurewei.com>
     Author:    Acee Lindem
                <mailto:acee.ietf@gmail.com>
    ";

  description
    "The YANG module defines the configuration and operatioanl state
     for OSPFv3 extensions to support Segment Routing over IPv6 data
     plane.

     This YANG model conforms to the Network Management
     Datastore Architecture (NDMA) as described in RFC 8342.

     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 XXXX
     (https://www.rfc-editor.org/info/rfcXXXX); see the RFC itself
     for full legal notices.

     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 (RFC 2119) (RFC 8174) when, and only when,
     they appear in all capitals, as shown here.";

  revision 2023-09-09 {
    description
      "Initial revision.";
    reference
      "RFC XXXX: YANG Data Model for OSPF SRv6";
  }

  /* Identities */
  identity SRV6_END_FUNC_TYPE {
    description
      "Base identity type for srv6 endpoint function code points.";
  }

  identity SRV6_END_FUNC_NO_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End (no PSP, no USP).";
  }

  identity SRV6_END_FUNC_PSP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End with PSP.";
  }

  identity SRV6_END_FUNC_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "END with USP.";
  }

  identity SRV6_END_FUNC_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "END with PSP & USP.";
  }

  identity SRV6_END_T_FUNC_NO_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.T (no PSP, no USP).";
  }

  identity SRV6_END_T_FUNC_PSP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.T with PSP.";
  }

  identity SRV6_END_T_FUNC_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.T with USP.";
  }

  identity SRV6_END_T_FUNC_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.T with PSP & USP.";
  }

  identity SRV6_END_X_FUNC_NO_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.x (no PSP, no USP).";
  }

  identity SRV6_END_X_FUNC_PSP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.x with PSP.";
  }

  identity SRV6_END_X_FUNC_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.x with USP.";
  }

  identity SRV6_END_X_FUNC_PSP_USP {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.x with PSP & USP.";
  }

  identity SRV6_END_FUNC_DX6 {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.DX6 function.";
  }

  identity SRV6_END_FUNC_DT6 {
    base "SRV6_END_FUNC_TYPE";
    description
      "End.DT6 function.";
  }

  identity SRV6_END_FUNC_OTP {
    base "SRV6_END_FUNC_TYPE";
    description
      "END.OTP.";
  }

  identity s1-bit {
    base ospf:ospfv3-lsa-option;
    description
      "The S1/S2 bits are dependent on the desired
       flooding scope for the LSA.";
  }

  identity s2-bit {
    base ospf:ospfv3-lsa-option;
    description
      "The S1/S2 bits are dependent on the desired
       flooding scope for the LSA.";
  }

  identity srv6-locator-lsa {
    base ospf:ospfv3-lsa-type;
    description
      "SRv6 Locator LSA - Type TBD";
  }

  identity LOCATOR-ROUTE-TYPE {
    description
      "The type of the locator route.";
  }

  identity INTRA-AREA-LOCATOR {
    base "LOCATOR-ROUTE-TYPE";
    description
      "Intra-Area";
  }

  identity INTER-AREA-LOCATOR {
    base "LOCATOR-ROUTE-TYPE";
    description
      "Inter-Area";
  }
  identity AS-EXTERNAL-LOCATOR {
    base "LOCATOR-ROUTE-TYPE";
    description
      "AS External";
  }

  identity NSSA-EXTERNAL-LOCATOR {
    base "LOCATOR-ROUTE-TYPE";
    description
      "NSSA External";
  }

  identity srv6-capability-bit {
    description
      "Base identity for SRv6 capability TLV bits.";
  }

  identity o-bit {
    base srv6-capability-bit;
    description
      "O-flag.";
    reference
      "RFC 9259: Operations, Administration, and Maintenance (OAM)
       in Segment Routing over IPv6 (SRv6)";
  }

  identity srv6-end-sid-bit {
    description
      "Base identity for SRv6 End SID sub-TLV bits.";
  }

  identity srv6-endx-sid-bit {
    description
      "Base identity for SRv6 End.X SID sub-TLV bits.";
  }

  identity b-bit {
    base srv6-endx-sid-bit;
    description
      "B-flag. Backup flag. If set, the End.X sid is
       eligible for protection.";
  }

  identity s-bit {
    base srv6-endx-sid-bit;
    description
      "S-flag. Set flag. When set, the End.X sid refers to
       a set of adjacencies (and therefore May be assigned
       to other adjacencies as well.";
  }

  identity p-bit {
    base srv6-endx-sid-bit;
    description
      "P-flag. Persistent flag. When set, the End.X sid is
       persistently allocated, i.e., the End.x sid value
       remains consistent across router restart and/or
       interface flap.";
  }

  identity ac-bit {
    base ospfv3-e-lsa:ospfv3-e-prefix-option;
    description
      "When the prefix/SRv6 Locator is configured as anycast,
       the AC-bit MUST be set. Otherwise, this flag MUST be
       clear.";
    reference
      "draft-ietf-lsr-ospfv3-srv6-extensions";
  }

  /* typedef */
  typedef srv6-sid-value {
    type inet:ipv6-address-no-zone;
    description
      "16 Octets encoded sid value.";
  }

  /* Features */
  feature srv6-ti-lfa {
    description
      "Enhance SRv6 FRR with ti-lfa
       support";
  }

  /* Groupings */
  grouping srv6-capabilities {
    description
      "SRV6 capability grouping.";
    container srv6-capability {
      description
        "SRv6 capability.";
      leaf-list flags {
        type identityref {
          base srv6-capability-bit;
        }
        description
          "SRv6 Capability TLV flag bits list.";
      }
    }
  }

  grouping srv6-endpoint-func {
    description
      "This group defines srv6 endpoint function";
    container endpoint-func {
      description
        "SRv6 Endpoint function Descriptor.";
      leaf-list flags {
        type identityref {
          base srv6-end-sid-bit;
        }
        description
          "SRv6 End SID sub-TLV  flag bits list. No flags
           are currently being defined.";
      }
      leaf endpoint-func {
        type identityref {
          base SRV6_END_FUNC_TYPE;
        }
        description
          "The endpoint function.";
      }
      leaf undefined-endpoint-func {
        type uint16;
        description
          "Unknown endpoint func value.";
      }
    }
  }

  grouping srv6-end-sids {
    description
      "This group defines srv6 end sid";
    container srv6-end-sid {
      description
        "SRv6 Segment Identifier(SID) with Endpoint functions.";
      leaf-list flags {
        type identityref {
          base srv6-end-sid-bit;
        }
        description
          "SRv6 end sid flags.";
      }

      uses srv6-endpoint-func;
      leaf sid {
        type srv6-sid-value;
        description
          "SRV6 sid value.";
      }
      uses srv6-sid-structures;
    }
  }

  grouping srv6-sid-structures {
    description
      "This group defines SRv6 SID Structure sub-TLV.";
    container srv6-sid-structure {
      description
        "SRv6 SID Structure sub-TLV is used to advertise the length
         of each individual part of the SRv6 SID as defined in
         [I-D.ietf-spring-srv6-network-programming]";
      leaf lb-length {
        type uint8;
        description
          "SRv6 SID Locator Block length in bits.";
      }

      leaf ln-length {
        type uint8;
        description
          "SRv6 SID Locator Node length in bits.";
      }

      leaf fun-length {
        type uint8;
        description
          "SRv6 SID Function length in bits.";
      }

      leaf arg-length {
        type uint8;
        description
          "SRv6 SID Argument length in bits.";
      }
    }
  }

  grouping srv6-endx-sids {
    description
      "This group defines SRv6 SIDs Associated with Adjacencies
      including SRv6 End.X SID Sub-TLV and SRv6 LAN End.X SID
      Sub-TLV.";
    container srv6-endx-sid {
      description
        "SRv6 sids associated with an adjacency.";

      uses srv6-endpoint-func;

      leaf-list func-flags {
        type identityref {
          base srv6-endx-sid-bit;
        }
        description
          "Flags for SRv6 end x SID.";
      }

      leaf algorithm {
        type uint8;
        description
          "Associated algorithm.";
      }

      leaf weight {
        type uint8;
        description
          "8 bit field whose value represents the weight of the End.X
           SID for the purpose of load balancing";
      }

      leaf-list sid {
        type srv6-sid-value;
        description
          "SRV6 sid value.";
      }

      leaf neighbor-router-id {
         type yang:dotted-quad;
         description
           "Neighbor router ID.This is only
            used on LAN adjacencies.";
      }

      uses srv6-sid-structures;
    }
  }

  grouping srv6-locactor-tlvs {
    description
      "This group defines srv6 locator tlv.";
    container srv6-locactor-tlv {
      description
        "This contains a SRv6 locator tlv.";
      leaf route-type {
        type identityref {
          base LOCATOR-ROUTE-TYPE;
        }
        description
          "The type of the locator route";
      }

      leaf algorithm {
        type uint8;
        description
          "Associated algorithm.";
      }

      leaf locator-length {
        type uint8;
        description
          "Carries the length of the Locator
           prefix as number of bits (1-128)";
      }

      leaf-list flags {
        type identityref {
          base ospfv3-e-lsa:ospfv3-e-prefix-option;
        }
        description
          "Flags for srv6 locator tlv.";
      }

      leaf metric {
        type uint32;
        description
          "Metric value.";
      }

      leaf-list locator {
        type inet:ipv6-address-no-zone;
        description
          "Advertised SRV6 locator.";
      }
      uses srv6-end-sids;
    }
  }

  /* Cfg */
  augment "/rt:routing/" +
          "rt:control-plane-protocols/rt:control-plane-protocol"+
          "/ospf:ospf" {
    when "../rt:type = 'ospf:ospfv3'" {
      description
        "This augment OSPFv3 routing protocol when used";
    }
    description
      "This augments OSPFv3 protocol configuration
       with SRv6.";
    container srv6{
      leaf enable{
        type boolean;
        default "false";
        description
          "Enables SRv6 protocol extensions.";
      }
      leaf default-locator {
        type boolean;
        default "false";
        description
          "Enable OSPFv3 segment-routing IPv6 with default Locator.";
      }
      leaf-list locator-name {
        when "not(../default-locator='true')" {
          description
            "Only applies to non default locator.";
        }
        type leafref {
          path "/rt:routing/sr:segment-routing/srv6:srv6"
             + "/srv6:locators/srv6:locator/srv6:name";
        }
        description
          "Enable OSPFv3 segment-routing IPv6 with specified
           locator.";
      }
      leaf persistent-end-x-sid{
        type boolean;
        default "false";
        description
          "Enable the persistent nature of End.X sid";
      }
      description
        "Configuration about OSPFv3 segment-routing IPv6.";
    }

    container micro-loop-avoidance {
      leaf srv6-enable {
        type boolean;
        default "false";
        description
          "Enable SRv6 avoid-microloop.Depend on SR IPv6 Enable.";
      }

      leaf srv6-rib-update-delay {
        type uint16 {
          range "1000..10000";
        }
        units "ms";
        default "5000";
        description
          "Set the route delivery delay for SRv6 avoid-microloop.
           Depend on SR IPv6 Enable.";
      }

      description
        "Enable OSPFv3 avoid-microloop.";
    }
  }

  augment "/rt:routing/" +
          "rt:control-plane-protocols/rt:control-plane-protocol"+
          "/ospf:ospf/ospf:fast-reroute"{
    when "../../rt:type = 'ospf:ospfv3'"{
      description
        "This augment OSPFv3 routing protocol when used";
    }
    description
      "This augments OSPFv3 IP FRR with IPV6 TILFA.";

    container srv6-ti-lfa {
      if-feature srv6-ti-lfa;
      leaf enable {
        type boolean;
        description
          "Enables SRv6 TI-LFA computation.";
      }
      description
        "SRv6 TILFA configuration.";
    }
  }

  /* Database */
  augment "/rt:routing/"
           + "rt:control-plane-protocols/rt:control-plane-protocol/"
           + "ospf:ospf/ospf:database/"
           + "ospf:as-scope-lsa-type/ospf:as-scope-lsas/"
           + "ospf:as-scope-lsa/ospf:version/ospf:ospfv3/"
           + "ospf:ospfv3/ospf:body" {
    when "../../../../../../../rt:type = 'ospf:ospfv3'" {
      description
        "This augment OSPFv3 routing protocol when used";
    }
    description
      "This augments OSPFv3 protocol router capability.";
    container srv6-locator {
      description
        "SRv6 Locator LSA.";
      uses srv6-locactor-tlvs;
    }
  }

  augment "/rt:routing/"
           + "rt:control-plane-protocols/rt:control-plane-protocol/"
           + "ospf:ospf/ospf:database/"
           + "ospf:as-scope-lsa-type/ospf:as-scope-lsas/"
           + "ospf:as-scope-lsa/ospf:version/ospf:ospfv3/"
           + "ospf:ospfv3/ospf:body/ospf:router-information" {
    when "../../../../../../../../rt:type = 'ospf:ospfv3'" {
      description
        "This augment OSPFv3 routing protocol when used";
    }
    description
      "This augments OSPFv3 protocol router capability.";
    uses srv6-capabilities;
    uses srv6:srv6-msd-signaled;
  }

  augment "/rt:routing/rt:control-plane-protocols"
        + "/rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area"
        + "/ospf:database/ospf:area-scope-lsa-type"
        + "/ospf:area-scope-lsas"
        + "/ospf:area-scope-lsa/ospf:version/ospf:ospfv3"
        + "/ospf:ospfv3/ospf:body/ospfv3-e-lsa:e-router/"
        + "ospfv3-e-lsa:e-router-tlvs/"
        + "ospfv3-e-lsa:link-tlv" {
    when "../../../../../../../../../../../../rt:type"
         + "= 'ospf:ospfv3'" {
      description
        "This augment OSPFv3 routing protocol when used";
    }
    description
      "This augments OSPFv3 protocol neighbor.";
    uses srv6-endx-sids;
  }

  /* Notifications */
}

<CODE ENDS>

5. Security Considerations

The YANG modules specified in this document define 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].

The Network Configuration Access Control Model [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 the modules that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability:

  • srv6
  • micro-loop-avoidance
  • srv6-ti-lfa

There are a number of data nodes defined in the modules that are writable/creatable/deletable (i.e., config true, which is the default). These data nodes may be considered sensitive or vulnerable in some network environments. Write operations (e.g., edit-config) to these data nodes without proper protection can have a negative effect on network operations. These are the subtrees and data nodes and their sensitivity/vulnerability:

  • srv6-locator
  • srv6-capability
  • srv6-msd
  • srv6-endx-sid

6. Contributors

   Qin Wu
   Huawei
   Email: bill.wu@huawei.com

7. Acknowledgements

TBD.

8. IANA Considerations

The IANA is requested to assign two new URIs from the IETF XML registry ([RFC3688]). Authors are suggesting the following URI:


        URI: urn:ietf:params:xml:ns:yang:ietf-ospfv3-srv6
        Registrant Contact: The IESG.
        XML: N/A, the requested URI is an XML namespace

This document also requests one new YANG module name in the YANG Module Names registry ([RFC6020]) with the following suggestion :


        name: ietf-ospfv3-srv6
        namespace: urn:ietf:params:xml:ns:yang:ietf-ospfv3-srv6
        prefix: ospfv3-srv6
        reference: RFC XXXX

9. Normative References

[I-D.ietf-lsr-ospfv3-extended-lsa-yang]
Lindem, A., Palani, S., and Y. Qu, "YANG Model for OSPFv3 Extended LSAs", Work in Progress, Internet-Draft, draft-ietf-lsr-ospfv3-extended-lsa-yang-12, , <https://www.ietf.org/archive/id/draft-ietf-lsr-ospfv3-extended-lsa-yang-12.txt>.
[I-D.ietf-lsr-ospfv3-srv6-extensions]
Li, Z., Hu, Z., Talaulikar, K., and P. Psenak, "OSPFv3 Extensions for SRv6", Work in Progress, Internet-Draft, draft-ietf-lsr-ospfv3-srv6-extensions-15, , <https://www.ietf.org/archive/id/draft-ietf-lsr-ospfv3-srv6-extensions-15.txt>.
[I-D.ietf-rtgwg-segment-routing-ti-lfa]
Litkowski, S., Bashandy, A., Filsfils, C., Francois, P., Decraene, B., and D. Voyer, "Topology Independent Fast Reroute using Segment Routing", Work in Progress, Internet-Draft, draft-ietf-rtgwg-segment-routing-ti-lfa-08, , <https://www.ietf.org/archive/id/draft-ietf-rtgwg-segment-routing-ti-lfa-08.txt>.
[I-D.ietf-spring-srv6-yang]
Raza, S., Agarwal, S., Liu, X., Hu, Z., Hussain, I., Shah, H. C., Voyer, D., Matsushima, S., Horiba, K., Rajamanickam, J., and A. Abdelsalam, "YANG Data Model for SRv6 Base and Static", Work in Progress, Internet-Draft, draft-ietf-spring-srv6-yang-02, , <https://www.ietf.org/archive/id/draft-ietf-spring-srv6-yang-02.txt>.
[RFC2119]
Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, , <https://www.rfc-editor.org/info/rfc2119>.
[RFC3688]
Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688, DOI 10.17487/RFC3688, , <https://www.rfc-editor.org/info/rfc3688>.
[RFC6020]
Bjorklund, M., Ed., "YANG - A Data Modeling Language for the Network Configuration Protocol (NETCONF)", RFC 6020, DOI 10.17487/RFC6020, , <https://www.rfc-editor.org/info/rfc6020>.
[RFC6241]
Enns, R., Ed., Bjorklund, M., Ed., Schoenwaelder, J., Ed., and A. Bierman, Ed., "Network Configuration Protocol (NETCONF)", RFC 6241, DOI 10.17487/RFC6241, , <https://www.rfc-editor.org/info/rfc6241>.
[RFC7950]
Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language", RFC 7950, DOI 10.17487/RFC7950, , <https://www.rfc-editor.org/info/rfc7950>.
[RFC8174]
Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, , <https://www.rfc-editor.org/info/rfc8174>.
[RFC8340]
Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams", BCP 215, RFC 8340, DOI 10.17487/RFC8340, , <https://www.rfc-editor.org/info/rfc8340>.
[RFC8341]
Bierman, A. and M. Bjorklund, "Network Configuration Access Control Model", RFC 8341, DOI 10.17487/RFC8341, , <https://www.rfc-editor.org/info/rfc8341>.
[RFC8342]
Bjorklund, M., Schoenwaelder, J., Shafer, P., Watsen, K., and R. Wilton, "Network Management Datastore Architecture (NMDA)", RFC 8342, DOI 10.17487/RFC8342, , <https://www.rfc-editor.org/info/rfc8342>.
[RFC9020]
Litkowski, S., Qu, Y., Lindem, A., Sarkar, P., and J. Tantsura, "YANG Data Model for Segment Routing", RFC 9020, DOI 10.17487/RFC9020, , <https://www.rfc-editor.org/info/rfc9020>.
[RFC9129]
Yeung, D., Qu, Y., Zhang, J., Chen, I., and A. Lindem, "YANG Data Model for the OSPF Protocol", RFC 9129, DOI 10.17487/RFC9129, , <https://www.rfc-editor.org/info/rfc9129>.

Authors' Addresses

Zhibo Hu
Huawei Technologies
Huawei Bld., No.156 Beiqing Rd.
Beijing
100095
China
Xuesong Geng
Huawei Technologies
Huawei Bld., No.156 Beiqing Rd.
Beijing
100095
China
Kamran Raza
Cisco Systems, Inc.
2000 Innovation Drive Kanata, ON K2K-3E8 CA
Yingzhen Qu
Futurewei Technologies
2330 Central Express Way
Santa Clara, 950950
United States of America
Acee Lindem
301 Midenhall Way
Cary, NC, 27513
United States of America