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Versions: (draft-acee-lsr-ospfv3-extended-lsa-yang) 00 01 02 03 04 05 06 07

Internet                                                       A. Lindem
Internet-Draft                                             Cisco Systems
Intended status: Standards Track                               S. Palani
Expires: April 4, 2021                                         Microsoft
                                                                   Y. Qu
                                                               Futurewei
                                                         October 1, 2020


                  YANG Model for OSPFv3 Extended LSAs
               draft-ietf-lsr-ospfv3-extended-lsa-yang-06

Abstract

   This document defines a YANG data model augmenting the IETF OSPF YANG
   model to provide support for OSPFv3 Link State Advertisement (LSA)
   Extensibility as defined in RFC 8362.  OSPFv3 Extended LSAs provide
   extensible TLV-based LSAs for the base LSA types defined in RFC 5340.

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 April 4, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of



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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
   2.  Tree Diagrams . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  OSPFv3 Extended LSAs  . . . . . . . . . . . . . . . . . . . .   3
   4.  OSPFv3 Extended LSA Yang Module . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  25
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  26
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  26
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  26
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  28
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  28

1.  Overview

   YANG [RFC6020] [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 augmenting the IETF OSPF YANG
   model [I-D.ietf-ospf-yang], which itself augments [RFC8349], to
   provide support for configuration and operational state for OSPFv3
   Extended LSAs as defined in [RFC8362].

   The YANG modules in this document conform to the Network Management
   Datastore Architecture (NMDA) [RFC8342].

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 [RFC2119] [RFC8174].

2.  Tree Diagrams

   This document uses the graphical representation of data models
   defined in [RFC8340].




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3.  OSPFv3 Extended LSAs

   This document defines a model for the OSPFv3 Extended LSA feature.
   It is an augmentation of the OSPF base model provided support for
   OSPFv3 Link State Advertisement (LSA) Extensibility [RFC8362].
   OSPFv3 Extended LSAs provide extensible TLV-based LSAs for the base
   LSA types defined in [RFC5340].

   The OSPFv3 Extended LSA YANG module requires support for the OSPF
   base model[I-D.ietf-ospf-yang] which defines basic OSPF configuration
   and state.  The OSPF YANG model augments the ietf-routing YANG model
   defined in [RFC8022].  The augmentations defined in the ietf-ospfv3-
   extended-lsa YANG model will provide global configuration, area
   configuration, and addition of OSPFv3 Extended LSAs to the Link State
   Database (LSDB) operational state.

   module: ietf-ospfv3-extended-lsa
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf:
       +--rw extended-lsa-support?   boolean
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area:
       +--rw extended-lsa-support?   boolean
     augment /rt:routing/rt:control-plane-protocols
             /rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area
             /ospf:interfaces/ospf:interface/ospf:database
             /ospf:link-scope-lsa-type/ospf:link-scope-lsas
             /ospf:link-scope-lsa/ospf:version/ospf:ospfv3
             /ospf:ospfv3/ospf:body:
       +--ro e-link
          +--ro rtr-priority?   uint8
          +--ro lsa-options
          |  +--ro lsa-options*   identityref
          +--ro e-link-tlvs* []
             +--ro unknown-tlv
             |  +--ro type?     uint16
             |  +--ro length?   uint16
             |  +--ro value?    yang:hex-string
             +--ro intra-prefix-tlv
             |  +--ro intra-prefix-tlv-length?   uint16
             |  +--ro metric?                    rt-types:uint24
             |  +--ro prefix?                    inet:ip-prefix
             |  +--ro prefix-options
             |  |  +--ro prefix-options*   identityref
             |  +--ro prefix-length?             uint8
             |  +--ro sub-tlvs* []
             |     +--ro unknown-sub-tlv
             |        +--ro type?     uint16



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             |        +--ro length?   uint16
             |        +--ro value?    yang:hex-string
             +--ro ipv6-link-local-tlv
             |  +--ro ipv6-link-local-tlv-length?   uint16
             |  +--ro link-local-address?           inet:ipv6-address
             |  +--ro sub-tlvs* []
             |     +--ro unknown-sub-tlv
             |        +--ro type?     uint16
             |        +--ro length?   uint16
             |        +--ro value?    yang:hex-string
             +--ro ipv4-link-local-tlv
                +--ro ipv4-link-local-tlv-length?   uint16
                +--ro link-local-address?           inet:ipv4-address
                +--ro sub-tlvs* []
                   +--ro unknown-sub-tlv
                      +--ro type?     uint16
                      +--ro length?   uint16
                      +--ro value?    yang:hex-string
     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:
       +--ro e-router
       |  +--ro router-bits
       |  |  +--ro rtr-lsa-bits*   identityref
       |  +--ro lsa-options
       |  |  +--ro lsa-options*   identityref
       |  +--ro e-router-tlvs* []
       |     +--ro unknown-tlv
       |     |  +--ro type?     uint16
       |     |  +--ro length?   uint16
       |     |  +--ro value?    yang:hex-string
       |     +--ro link-tlv
       |        +--ro link-tlv-length?         uint16
       |        +--ro interface-id?            uint32
       |        +--ro neighbor-interface-id?   uint32
       |        +--ro neighbor-router-id?      rt-types:router-id
       |        +--ro type?                    uint8
       |        +--ro metric?                  uint16
       |        +--ro sub-tlvs* []
       |           +--ro unknown-sub-tlv
       |              +--ro type?     uint16
       |              +--ro length?   uint16
       |              +--ro value?    yang:hex-string
       +--ro e-network
       |  +--ro lsa-options
       |  |  +--ro lsa-options*   identityref



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       |  +--ro e-network-tlvs* []
       |     +--ro unknown--tlv
       |     |  +--ro type?     uint16
       |     |  +--ro length?   uint16
       |     |  +--ro value?    yang:hex-string
       |     +--ro attached-router-tlv
       |        +--ro attached-router-tlv-length?   uint16
       |        +--ro Adjacent-neighbor-router-id*  rt-types:router-id
       |        +--ro sub-tlvs* []
       |           +--ro unknown-sub-tlv
       |              +--ro type?     uint16
       |              +--ro length?   uint16
       |              +--ro value?    yang:hex-string
       +--ro e-inter-area-prefix
       |  +--ro e-inter-prefix-tlvs* []
       |     +--ro unknown--tlv
       |     |  +--ro type?     uint16
       |     |  +--ro length?   uint16
       |     |  +--ro value?    yang:hex-string
       |     +--ro inter-prefix-tlv
       |        +--ro inter-prefix-tlv-length?   uint16
       |        +--ro metric?                    rt-types:uint24
       |        +--ro prefix?                    inet:ip-prefix
       |        +--ro prefix-options
       |        |  +--ro prefix-options*   identityref
       |        +--ro prefix-length?             uint8
       |        +--ro sub-tlvs* []
       |           +--ro unknown-sub-tlv
       |              +--ro type?     uint16
       |              +--ro length?   uint16
       |              +--ro value?    yang:hex-string
       +--ro e-inter-area-router
       |  +--ro e-inter-router-tlvs* []
       |     +--ro unknown-tlv
       |     |  +--ro type?     uint16
       |     |  +--ro length?   uint16
       |     |  +--ro value?    yang:hex-string
       |     +--ro inter-router-tlv
       |        +--ro inter-router-tlv-length?   uint16
       |        +--ro router-bits
       |        |  +--ro rtr-lsa-bits*   identityref
       |        +--ro lsa-options
       |        |  +--ro lsa-options*   identityref
       |        +--ro metric?                    rt-types:uint24
       |        +--ro destination-router-id?     rt-types:router-id
       |        +--ro sub-tlvs* []
       |           +--ro unknown-sub-tlv
       |              +--ro type?     uint16



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       |              +--ro length?   uint16
       |              +--ro value?    yang:hex-string
       +--ro e-intra-area-prefix
          +--ro referenced-ls-type?         uint16
          +--ro referenced-link-state-id?   uint32
          +--ro referenced-adv-router?      rt-types:router-id
          +--ro e-intra-prefix-tlvs* []
             +--ro unknown-tlv
             |  +--ro type?     uint16
             |  +--ro length?   uint16
             |  +--ro value?    yang:hex-string
             +--ro intra-prefix-tlv
                +--ro intra-prefix-tlv-length?   uint16
                +--ro metric?                    rt-types:uint24
                +--ro prefix?                    inet:ip-prefix
                +--ro prefix-options
                |  +--ro prefix-options*   identityref
                +--ro prefix-length?             uint8
                +--ro sub-tlvs* []
                   +--ro unknown-sub-tlv
                      +--ro type?     uint16
                      +--ro length?   uint16
                      +--ro value?    yang:hex-string
     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 e-as-external
       |  +--ro e-external-tlvs* []
       |     +--ro unknown-tlv
       |     |  +--ro type?     uint16
       |     |  +--ro length?   uint16
       |     |  +--ro value?    yang:hex-string
       |     +--ro external-prefix-tlv
       |        +--ro external-prefix-tlv-length?   uint16
       |        +--ro flags
       |        |  +--ro ospfv3-e-external-prefix-bits*   identityref
       |        +--ro metric?                       rt-types:uint24
       |        +--ro prefix?                       inet:ip-prefix
       |        +--ro prefix-options
       |        |  +--ro prefix-options*   identityref
       |        +--ro prefix-length?                uint8
       |        +--ro sub-tlvs* []
       |           +--ro unknown-sub-tlv
       |           |  +--ro type?     uint16
       |           |  +--ro length?   uint16
       |           |  +--ro value?    yang:hex-string



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       |           +--ro ipv6-fwd-addr-sub-tlv
       |           |  +--ro ipv6-fwd-addr-sub-tlv-length?   uint16
       |           |  +--ro forwarding-address?       inet:ipv6-address
       |           +--ro ipv4-fwd-addr-sub-tlv
       |           |  +--ro ipv4-fwd-addr-sub-tlv-length?   uint16
       |           |  +--ro forwarding-address?       inet:ipv4-address
       |           +--ro route-tag-sub-tlv
       |              +--ro route-tag-sub-tlv-length?   uint16
       |              +--ro route-tag?                  uint32
       +--ro e-nssa
          +--ro e-external-tlvs* []
             +--ro unknown-tlv
             |  +--ro type?     uint16
             |  +--ro length?   uint16
             |  +--ro value?    yang:hex-string
             +--ro external-prefix-tlv
                +--ro external-prefix-tlv-length?   uint16
                +--ro flags
                |  +--ro ospfv3-e-external-prefix-bits*   identityref
                +--ro metric?                       rt-types:uint24
                +--ro prefix?                       inet:ip-prefix
                +--ro prefix-options
                |  +--ro prefix-options*   identityref
                +--ro prefix-length?                uint8
                +--ro sub-tlvs* []
                   +--ro unknown-sub-tlv
                   |  +--ro type?     uint16
                   |  +--ro length?   uint16
                   |  +--ro value?    yang:hex-string
                   +--ro ipv6-fwd-addr-sub-tlv
                   |  +--ro ipv6-fwd-addr-sub-tlv-length?   uint16
                   |  +--ro forwarding-address?       inet:ipv6-address
                   +--ro ipv4-fwd-addr-sub-tlv
                   |  +--ro ipv4-fwd-addr-sub-tlv-length?   uint16
                   |  +--ro forwarding-address?       inet:ipv4-address
                   +--ro route-tag-sub-tlv
                      +--ro route-tag-sub-tlv-length?   uint16
                      +--ro route-tag?                  uint32


4.  OSPFv3 Extended LSA Yang Module

   The following RFCs and drafts are not referenced in the document text
   but are referenced in the ietf-ospfv3-extended-lsa.yang module:
   [RFC6991], [RFC8294].

   <CODE BEGINS> file "ietf-ospfv3-extended-lsa@2020-10-01.yang"
   module ietf-ospfv3-extended-lsa {



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     yang-version 1.1;
     namespace
      "urn:ietf:params:xml:ns:yang:ietf-ospfv3-extended-lsa";

     prefix ospfv3-e-lsa;

     import ietf-routing-types {
       prefix "rt-types";
       reference "RFC 8294 - Common YANG Data Types for the
                  Routing Area";
     }

     import ietf-inet-types {
       prefix "inet";
       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-ospf {
       prefix "ospf";
       reference "RFC YYYY - A YANG Data Model for OSPF
                  Protocol";
     }

     organization
       "IETF LSR - Link State Routing Working Group";

     contact
        "WG Web:   <http://tools.ietf.org/wg/lsr/>
         WG List:  <mailto:lsr@ietf.org>

         Author:   Acee Lindem
                   <mailto:acee@cisco.com>
         Author:   Sharmila Palani
                   <mailto:sharmila.palani@microsoft.com>
         Author:   Yingzhen Qu
                   <mailto:yingzhen.qu@futurewei.com>";

     description
       "This YANG module defines the configuration
        and operational state for OSPFv3 Extended LSAs, which is
        common across all of the vendor implementations. The
        semantics and encodings for OSPFv3 Extended LSAs is



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        described in RFC 8362.

        This YANG model conforms to the Network Management
        Datastore Architecture (NMDA) as described in RFC 8242.

        Copyright (c) 2020 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 Simplified BSD License
        set forth in Section 4.c of the IETF Trust's Legal Provisions
        Relating to IETF Documents
        (http://trustee.ietf.org/license-info).

        This version of this YANG module is part of RFC XXXX;
        see the RFC itself for full legal notices.";

     reference "RFC XXXX - YANG Model for OSPFv3 Extended LSAs";

     revision 2020-10-01 {
       description
         "Initial revision.";
       reference
         "RFC XXXX: A YANG Data Model for OSPFv3 Extended LSAs.";
     }

     /*
      * OSPFv3 Extend LSA Type Identities
      */
     identity ospfv3-e-router-lsa {
       base ospf:ospfv3-lsa-type;
       description
         "OSPFv3 Extended Router LSA - Type 0xA021";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.1";
     }

     identity ospfv3-e-network-lsa {
       base ospf:ospfv3-lsa-type;
       description
         "OSPFv3 Extended Network LSA - Type 0xA022";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.2";
     }

     identity ospfv3-e-summary-lsa-type {
       base ospf:ospfv3-lsa-type;



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       description
         "OSPFv3 Extended Summary LSA types";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.3 and Section 4.4";
     }

     identity ospfv3-e-inter-area-prefix-lsa {
       base ospfv3-e-summary-lsa-type;
       description
         "OSPFv3 Extended Inter-area Prefix LSA - Type 0xA023";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.3";
     }

     identity ospfv3-e-inter-area-router-lsa {
       base ospfv3-e-summary-lsa-type;
       description
         "OSPFv3 Extended Inter-area Router LSA - Type 0xA024";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.3";
     }

     identity ospfv3-e-external-lsa-type {
       base ospf:ospfv3-lsa-type;
       description
         "OSPFv3 Extended External LSA types";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.5 and Section 4.6";
     }

     identity ospfv3-e-as-external-lsa {
       base ospfv3-e-external-lsa-type;
       description
         "OSPFv3 Extended AS-External LSA - Type 0xC025";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.5";
     }

     identity ospfv3-e-nssa-lsa {
       base ospfv3-e-external-lsa-type;
       description
         "OSPFv3 Extended Not-So-Stubby-Area (NSSA) LSA -
          Type 0xA027";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.6";
     }

     identity ospfv3-e-link-lsa {



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       base ospf:ospfv3-lsa-type;
       description
         "OSPFv3 Extended Link LSA - Type 0x8028";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.7";
     }

     identity ospfv3-e-intra-area-prefix-lsa {
       base ospf:ospfv3-lsa-type;
       description
         "OSPFv3 Extended Intra-area Prefix LSA - Type 0xA029";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 4.8";
     }

     identity ospfv3-e-prefix-option {
       description
         "Base identity for OSPFv3 Prefix Options.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.1";
     }

     identity nu-bit {
       base ospfv3-e-prefix-option;
       description
         "When set, the prefix should be excluded
          from IPv6 unicast calculations.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.1";
     }

     identity la-bit {
       base ospfv3-e-prefix-option;
       description
         "When set, the prefix is actually an IPv6 interface
          address of the Advertising Router.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.1";
     }

     identity p-bit {
       base ospfv3-e-prefix-option;
       description
         "When set, the NSSA area prefix should be
          translated to an AS External LSA and advertised
          by the translating NSSA Border Router.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.1";



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     }

     identity dn-bit {
       base ospfv3-e-prefix-option;
       description
         "When set, the inter-area-prefix LSA or
          AS-external LSA prefix has been advertised as an
          L3VPN prefix.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.1";
     }

     identity n-bit {
       base ospfv3-e-prefix-option;
       description
         "When set, the prefix is a host address that identifies
          the advertising router.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.1";
     }

     identity ospfv3-e-external-prefix-option {
       description
         "Base identity for OSPFv3 External Prefix Options.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.6";
     }

     identity e-bit {
       base ospfv3-e-external-prefix-option;
       description
         "When set, the metric specified is a Type 2
          external metric.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.6";
     }

     grouping unknown-sub-tlv {
       description
         "Unknown TLV grouping";
       container unknown-sub-tlv {
         uses ospf:tlv;
         description "Unknown External TLV Sub-TLV";
       }
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 6.3";
     }




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     grouping ospfv3-lsa-prefix {
       description
         "OSPFv3 LSA prefix";

       leaf prefix {
         type inet:ip-prefix;
         description
           "LSA Prefix";
       }
       container prefix-options {
         leaf-list prefix-options {
           type identityref {
             base ospfv3-e-prefix-option;
           }
           description
             "OSPFv3 prefix option flag list. This list will
              contain the identities for the OSPFv3 options
              that are set for the OSPFv3 prefix.";
         }
         description "Prefix options.";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 3.1";
       }

       leaf prefix-length {
         type uint8 {
           range "0..128";
         }
         description "Prefix length.";
       }
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3";
     }

     grouping ipv6-fwd-addr-sub-tlv {
       container ipv6-fwd-addr-sub-tlv {
         description
           "IPv6 Forwarding Address Sub-TLV";
         leaf ipv6-fwd-addr-sub-tlv-length {
           type uint16;
           description
             "IPv6 Forwarding Addrss Sub-TLV Length - 16
              for IPv6 address";
         }
         leaf forwarding-address {
           type inet:ipv6-address;
           description
             "Forwarding address";



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         }
       }
       description
         "IPv6 Forwarding Address Sub-TLV grouping";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.10";
     }

     grouping ipv4-fwd-addr-sub-tlv {
       container ipv4-fwd-addr-sub-tlv {
         description
           "IPv4 Forwarding Address Sub-TLV";
         leaf ipv4-fwd-addr-sub-tlv-length {
           type uint16;
           description
             "IPv4 Forwarding Addrss Sub-TLV Length - 4
              for IPv4 address";
         }
         leaf forwarding-address {
           type inet:ipv4-address;
           description
             "Forwarding address";
         }
       }
       description
         "IPv4 Forwarding Address Sub-TLV grouping";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.11";
     }

     grouping route-tag-sub-tlv {
       container route-tag-sub-tlv {
         description
           "Route Tag Sub-TLV";
         leaf route-tag-sub-tlv-length {
           type uint16;
           description
             "Route Tag Sub-TLV Length - 4 for 32-bit tag";
         }
         leaf route-tag {
           type uint32;
           description
             "Route Tag";
         }
       }
       description
         "Route Tag Sub-TLV grouping";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)



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                 Extensibility, Section 3.12";
     }

     grouping external-prefix-tlv {
       container external-prefix-tlv {
         description "External Prefix LSA TLV";
         leaf external-prefix-tlv-length {
           type uint16;
           description
             "External Prefix TLV Length - Variable dependent
              on sub-TLVs";
         }
         container flags {
           leaf-list ospfv3-e-external-prefix-bits {
             type identityref {
               base ospfv3-e-external-prefix-option;
             }
             description "OSPFv3 external-prefix TLV bits list.";
           }
           description "External Prefix Flags";
         }
         leaf metric {
           type rt-types:uint24;
           description "External Prefix Metric";
         }
         uses ospfv3-lsa-prefix;
         list sub-tlvs {
           description "External Prefix TLV Sub-TLVs";
           uses unknown-sub-tlv;
           uses ipv6-fwd-addr-sub-tlv;
           uses ipv4-fwd-addr-sub-tlv;
           uses route-tag-sub-tlv;
         }
       }
       description "External Prefix TLV Grouping";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.6";
     }

     grouping intra-area-prefix-tlv {
       container intra-prefix-tlv {
         description "Intra-Area Prefix LSA TLV";
         leaf intra-prefix-tlv-length {
           type uint16;
           description
             "Intra-Area Prefix TLV Length - Variable dependent
              on sub-TLVs";
         }



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         leaf metric {
           type rt-types:uint24;
           description "Intra-Area Prefix Metric";
         }
         uses ospfv3-lsa-prefix;
         list sub-tlvs {
           description "Intra-Area Prefix TLV Sub-TLVs";
           uses unknown-sub-tlv;
         }
       }
       description "Intra-Area Prefix TLV Grouping";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
                 Extensibility, Section 3.4";
     }

     grouping ipv6-link-local-tlv {
       container ipv6-link-local-tlv {
         description "IPv6 Link-Local LSA TLV";
         leaf ipv6-link-local-tlv-length {
           type uint16;
           description
             "IPv6 Link-Local TLV Length - Variable dependent
              on sub-TLVs";
         }
         leaf link-local-address {
           type inet:ipv6-address;
           description
             "IPv6 Link Local address";
         }
         list sub-tlvs {
           description "IPv6 Link Local TLV Sub-TLVs";
           uses unknown-sub-tlv;
         }
       }
       description "IPv6 Link-Local TLV Grouping";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
         Extensibility, Section 3.8";
     }

     grouping ipv4-link-local-tlv {
       container ipv4-link-local-tlv {
         description "IPv4 Link-Local LSA TLV";
         leaf ipv4-link-local-tlv-length {
           type uint16;
           description
             "IPv4 Link-Local TLV Length - Variable dependent
              on sub-TLVs";
         }



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         leaf link-local-address {
           type inet:ipv4-address;
           description
             "IPv4 Link Local address";
         }
         list sub-tlvs {
           description "IPv4 Link Local TLV Sub-TLVs";
           uses unknown-sub-tlv;
         }
       }
       description "IPv4 Link-Local TLV Grouping";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
         Extensibility, Section 3.9";
     }

     grouping ospfv3-e-lsa-area {
       description "Area scope OSPFv3 Extended LSAs.";
       reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
         Extensibility, Section 4";

       container e-router {
         when  "../../ospf:header/ospf:type = "
           + "'ospfv3-e-lsa:ospfv3-e-router-lsa'" {
           description "Only valid for OSPFv3 Extended-Router LSAs";
         }
         description "OSPv3 Extended Router LSA";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 4.1";
         uses ospf:ospf-router-lsa-bits;
         uses ospf:ospfv3-lsa-options;

         list e-router-tlvs {
           description "E-Router LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description "Unknown E-Router TLV";
           }
           container link-tlv {
             description "E-Router LSA TLV";
             leaf link-tlv-length {
               type uint16;
               description
                 "Link TLV Length - Variable dependent on sub-TLVs";
             }
             leaf interface-id {
               type uint32;
               description "Interface ID for link";
             }



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             leaf neighbor-interface-id {
               type uint32;
               description "Neighbor's Interface ID for link";
             }
             leaf neighbor-router-id {
               type rt-types:router-id;
               description "Neighbor's Router ID for link";
             }
             leaf type {
               type ospf:router-link-type;
               description "Link type: 1 - Point-to-Point Link
                                       2 - Transit Network Link
                                       3 - Stub Network Link Link
                                       4 - Virtual Link";
             }
             leaf metric {
               type uint16;
                 description "Link Metric";
             }
             list sub-tlvs {
               description "Link TLV Sub-TLVs";
               uses unknown-sub-tlv;
             }
           }
         }
       }

       container e-network {
         when "../../ospf:header/ospf:type = "
            + "'ospfv3-e-lsa:ospfv3-e-network-lsa'" {
           description
             "Only applies to E-Network LSAs.";
         }
         description "Extended Network LSA";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 4.2";
         uses ospf:ospfv3-lsa-options;
         list e-network-tlvs {
           description "E-Network LSA TLVs";
           container unknown--tlv {
             uses ospf:tlv;
             description "Unknown E-Network TLV";
           }
           container attached-router-tlv {
             description "Attached Router TLV";
             leaf attached-router-tlv-length {
               type uint16;
               description



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                 "Attached Router TLV Length - Variable dependent
                  on sub-TLVs";
             }
             leaf-list Adjacent-neighbor-router-id {
               type rt-types:router-id;
               description "Adjacent Neighbor's Router ID";
             }
             list sub-tlvs {
               description "Attached Router TLV Sub-TLVs";
               uses unknown-sub-tlv;
             }
           }
         }
       }

       container e-inter-area-prefix {
         when "../../ospf:header/ospf:type = "
            + "'ospfv3-e-lsa:ospfv3-e-inter-area-prefix-lsa'" {
           description
             "Only applies to E-Inter-Area-Prefix LSAs.";
         }
         description "Extended Inter-Area Prefix LSA";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 4.3";
         list e-inter-prefix-tlvs {
           description "E-Inter-Area-Prefix LSA TLVs";
           container unknown--tlv {
             uses ospf:tlv;
             description "Unknown E-Inter-Area-Prefix TLV";
           }
           container inter-prefix-tlv {
             description "Unknown E-Inter-Area-Prefix LSA TLV";
             leaf inter-prefix-tlv-length {
               type uint16;
               description
                 "Inter-Area-Prefix TLV Length - Variable dependent
                  on sub-TLVs";
             }
             leaf metric {
               type rt-types:uint24;
                 description "Inter-Area Prefix Metric";
             }
             uses ospfv3-lsa-prefix;
             list sub-tlvs {
               description "Inter-Area Prefix TLV Sub-TLVs";
               uses unknown-sub-tlv;
             }
           }



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         }
       }

       container e-inter-area-router {
         when "../../ospf:header/ospf:type = "
            + "'ospfv3-e-lsa:ospfv3-e-inter-area-router-lsa'" {
           description
             "Only applies to E-Inter-Area-Router LSAs.";
         }
         description "Extended Inter-Area Router LSA";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 4.4";
         list e-inter-router-tlvs {
           description "E-Inter-Area-Router LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description "Unknown E-Inter-Area-Router TLV";
           }
           container inter-router-tlv {
             description "Unknown E-Inter-Area-Router LSA TLV";
             leaf inter-router-tlv-length {
               type uint16;
               description
                 "Inter-Area-Router TLV Length - Variable dependent
                  on sub-TLVs";
             }
             uses ospf:ospf-router-lsa-bits;
             uses ospf:ospfv3-lsa-options;
             leaf metric {
               type rt-types:uint24;
                 description "Inter-Area Router Metric";
             }
             leaf destination-router-id {
               type rt-types:router-id;
               description "Destination Router ID";
             }
             list sub-tlvs {
               description "Inter-Area Router TLV Sub-TLVs";
               uses unknown-sub-tlv;
             }
           }
         }
       }

       container e-intra-area-prefix {
         when "../../ospf:header/ospf:type = "
            + "'ospfv3-e-lsa:ospfv3-e-intra-area-prefix-lsa'" {
           description



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             "Only applies to E-Intra-Area-Prefix LSAs.";
         }
         description "E-Intra-Area-Prefix LSA";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 4.8";
         leaf referenced-ls-type {
           type uint16;
           description "Referenced Link State type";
         }
         leaf referenced-link-state-id {
           type uint32;
           description
             "Referenced Link State ID";
         }
         leaf referenced-adv-router {
           type rt-types:router-id;
           description
             "Referenced Advertising Router";
         }
         list e-intra-prefix-tlvs {
           description "E-Intra-Area-Prefix LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description "Unknown E-Intra-Area-Prefix TLV";
           }
           uses intra-area-prefix-tlv;
         }
       }
     }

     grouping ospfv3-e-lsa-as {
       description "AS scope OSPFv3 Extended LSAs.";
       container e-as-external {
         when "../../ospf:header/ospf:type = "
            + "'ospfv3-e-lsa:ospfv3-e-as-external-lsa'" {
           description
             "Only applies to E-AS-external LSAs.";
         }
         list e-external-tlvs {
           description "E-External LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description "Unknown E-External TLV";
           }
           uses external-prefix-tlv;
         }
         description "E-AS-External LSA.";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)



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           Extensibility, Section 4.5";
       }

       container e-nssa {
         when "../../ospf:header/ospf:type = "
            + "'ospfv3-e-lsa:ospfv3-e-nssa-lsa'" {
           description
             "Only applies to E-NSSA LSAs.";
         }
         list e-external-tlvs {
           description "E-NSSA LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description "Unknown E-External TLV";
           }
           uses external-prefix-tlv;
         }
         description "E-NSSA LSA.";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 4.6";
       }
     }

     grouping ospfv3-e-lsa-link {
       description "Link scope OSPFv3 Extended LSAs.";
       container e-link {
         when "../../ospf:header/ospf:type = "
            + "'ospfv3-e-lsa:ospfv3-e-link-lsa'" {
           description
             "Only applies to Extended Link LSAs.";
         }
         description "E-Link LSA";
         reference "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
           Extensibility, Section 4.7";
         leaf rtr-priority {
           type uint8;
           description "Router Priority for the interface.";
         }
         uses ospf:ospfv3-lsa-options;
         list e-link-tlvs {
           description "E-Link LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description "Unknown E-Link TLV";
           }
           uses intra-area-prefix-tlv;
           uses ipv6-link-local-tlv;
           uses ipv4-link-local-tlv;



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         }
       }
     }

     /* Configuration */
     augment "/rt:routing/rt:control-plane-protocols"
           + "/rt:control-plane-protocol/ospf:ospf" {
       when "../rt:type = 'ospf:ospfv3'" {
         description
           "This augments the OSPFv3 routing protocol when used.";
       }
       description
         "This augments the OSPFv3 protocol configuration
          with extended LSA support.";
       leaf extended-lsa-support {
         type boolean;
         default false;
         description
           "Enable OSPFv3 Extended LSA Support for the OSPFv3
            domain";
         reference
           "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
            Extensibility, Appendix B - ExtendedLSASupport";
       }
     }

     augment "/rt:routing/rt:control-plane-protocols/"
       + "rt:control-plane-protocol/ospf:ospf/ospf:areas/ospf:area" {
       when "../../../rt:type = 'ospf:ospfv3'" {
         description
           "This augments the OSPFv3 area configuration
            when used.";
       }
       description
         "This augments the OSPFv3 protocol area
          configuration with extended LSA support.";
       leaf extended-lsa-support {
         type boolean;
         must  "derived-from(../ospf:area-type,'stub-nssa-area') or "
            +  "(current() = 'true') or "
            +  "(../../../extended-lsa-support = 'false')" {
           description
              "For regular areas, i.e., areas where AS-scoped LSAs
               disabling AreaExtendedLSASupport for a regular
               OSPFv3 area (not a Stub or NSSA area) when
               ExtendedLSASupport is enabled is contradictory and
               is prohibited.";
         }



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         description
           "Enable OSPFv3 Extended LSA Support for the OSPFv3
            area. If not specified, Extended LSA support status
            is inherited from the instance level configuration.";
         reference
           "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
            Extensibility, Appendix B - AreaExtendedLSASupport";
       }
     }

     /*
      * Link State Database (LSDB) Augmentations
     */
     augment "/rt:routing/"
       + "rt:control-plane-protocols/rt:control-plane-protocol/"
       + "ospf:ospf/ospf:areas/ospf:area/"
       + "ospf:interfaces/ospf:interface/ospf:database/"
       + "ospf:link-scope-lsa-type/ospf:link-scope-lsas/"
       + "ospf:link-scope-lsa/ospf:version/ospf:ospfv3/"
       + "ospf:ospfv3/ospf:body" {
       when "../../../../../../../../../../../"
          + "rt:type = 'ospf:ospfv3'"  {
         description
           "This augmentation is only valid for OSPFv3.";
       }
       description
         "OSPFv3 Link-Scoped Extended LSAs";

       uses ospfv3-e-lsa-link;
     }

     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" {
       when "../../../../../../../../../"
          + "rt:type = 'ospf:ospfv3'" {
         description
           "This augmentation is only valid for OSPFv3.";
       }
       description
         "OSPFv3 Area-Scoped Extended LSAs";

       uses ospfv3-e-lsa-area;
     }




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     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 augmentation is only valid for OSPFv3.";
       }
       description
         "OSPFv3 AS-Scoped Extended LSAs";

       uses ospfv3-e-lsa-as;
     }
   }
   <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 NETCONF access control model [RFC6536] provides the means to
   restrict access for particular NETCONF or RESTCONF users to a pre-
   configured subset of all available NETCONF or RESTCONF protocol
   operations and content.

   There are a number of data nodes defined in ietf-ospfv3-extended-
   lsa.yang module that are writable/creatable/deletable (i.e., config
   true, which is the default).  These data nodes may be considered
   sensitive or vulnerable in some network environments.  Write
   operations (e.g., edit-config) to these data nodes without proper
   protection can have a negative effect on network operations.  For
   OSPFv3 Extended LSAs, the ability to disable OSPFv3 Extended LSA
   support result in a denial of service.

   Some of the readable data nodes in the ietf-ospfv3-extended-lsa.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.  The exposure
   of the Link State Database (LSDB) will expose the detailed topology



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   of the network.  This may be undesirable since both due to the fact
   that exposure may facilitate other attacks.  Additionally, network
   operators may consider their topologies to be sensitive confidential
   data.

6.  IANA Considerations

   This document registers a URI in the IETF XML registry [RFC3688].
   Following the format in [RFC3688], the following registration is
   requested to be made:

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

   This document registers a YANG module in the YANG Module Names
   registry [RFC6020].

      name: ietf-ospfv3-extended-lsa
      namespace: urn:ietf:params:xml:ns:yang:ietf-ospfv3-extended-lsa
      prefix: ospfv3-e-lsa
      reference: RFC XXXX

7.  Acknowledgements

   This document was produced using Marshall Rose's xml2rfc tool.

   The YANG model was developed using the suite of YANG tools written
   and maintained by numerous authors.

   Thanks much to Tom Petch for his review and comments.

8.  References

8.1.  Normative References

   [I-D.ietf-ospf-yang]
              Yeung, D., Qu, Y., Zhang, Z., Chen, I., and A. Lindem,
              "YANG Data Model for OSPF Protocol", draft-ietf-ospf-
              yang-29 (work in progress), October 2019.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.






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   [RFC3688]  Mealling, M., "The IETF XML Registry", BCP 81, RFC 3688,
              DOI 10.17487/RFC3688, January 2004,
              <https://www.rfc-editor.org/info/rfc3688>.

   [RFC5340]  Coltun, R., Ferguson, D., Moy, J., and A. Lindem, "OSPF
              for IPv6", RFC 5340, DOI 10.17487/RFC5340, July 2008,
              <https://www.rfc-editor.org/info/rfc5340>.

   [RFC6020]  Bjorklund, M., Ed., "YANG - A Data Modeling Language for
              the Network Configuration Protocol (NETCONF)", RFC 6020,
              DOI 10.17487/RFC6020, October 2010,
              <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, June 2011,
              <https://www.rfc-editor.org/info/rfc6241>.

   [RFC6242]  Wasserman, M., "Using the NETCONF Protocol over Secure
              Shell (SSH)", RFC 6242, DOI 10.17487/RFC6242, June 2011,
              <https://www.rfc-editor.org/info/rfc6242>.

   [RFC6536]  Bierman, A. and M. Bjorklund, "Network Configuration
              Protocol (NETCONF) Access Control Model", RFC 6536,
              DOI 10.17487/RFC6536, March 2012,
              <https://www.rfc-editor.org/info/rfc6536>.

   [RFC6991]  Schoenwaelder, J., Ed., "Common YANG Data Types",
              RFC 6991, DOI 10.17487/RFC6991, July 2013,
              <https://www.rfc-editor.org/info/rfc6991>.

   [RFC7950]  Bjorklund, M., Ed., "The YANG 1.1 Data Modeling Language",
              RFC 7950, DOI 10.17487/RFC7950, August 2016,
              <https://www.rfc-editor.org/info/rfc7950>.

   [RFC8022]  Lhotka, L. and A. Lindem, "A YANG Data Model for Routing
              Management", RFC 8022, DOI 10.17487/RFC8022, November
              2016, <https://www.rfc-editor.org/info/rfc8022>.

   [RFC8040]  Bierman, A., Bjorklund, M., and K. Watsen, "RESTCONF
              Protocol", RFC 8040, DOI 10.17487/RFC8040, January 2017,
              <https://www.rfc-editor.org/info/rfc8040>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/info/rfc8174>.





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   [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,
              <https://www.rfc-editor.org/info/rfc8294>.

   [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,
              <https://www.rfc-editor.org/info/rfc8342>.

   [RFC8349]  Lhotka, L., Lindem, A., and Y. Qu, "A YANG Data Model for
              Routing Management (NMDA Version)", RFC 8349,
              DOI 10.17487/RFC8349, March 2018,
              <https://www.rfc-editor.org/info/rfc8349>.

   [RFC8362]  Lindem, A., Roy, A., Goethals, D., Reddy Vallem, V., and
              F. Baker, "OSPFv3 Link State Advertisement (LSA)
              Extensibility", RFC 8362, DOI 10.17487/RFC8362, April
              2018, <https://www.rfc-editor.org/info/rfc8362>.

   [RFC8446]  Rescorla, E., "The Transport Layer Security (TLS) Protocol
              Version 1.3", RFC 8446, DOI 10.17487/RFC8446, August 2018,
              <https://www.rfc-editor.org/info/rfc8446>.

8.2.  Informative References

   [RFC8340]  Bjorklund, M. and L. Berger, Ed., "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/info/rfc8340>.

Authors' Addresses

   Acee Lindem
   Cisco Systems
   301 Midenhall Way
   Cary, NC 27513

   EMail: acee@cisco.com


   Sharmila Palani
   Microsoft
   1 Microsoft Way, Redmond, WA 98052170 West Tasman Drive
   Redmond, WA 98052

   EMail: sharmila.palani@microsoft.com





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   Yingzhen Qu
   Futurewei
   2330 Central Expressway
   Santa Clara, CA  95050
   USA

   EMail: yingzhen.qu@futurewei.com












































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