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YANG Model for OSPFv3 Extended LSAs
draft-ietf-lsr-ospfv3-extended-lsa-yang-29

The information below is for an old version of the document that is already published as an RFC.
Document Type
This is an older version of an Internet-Draft that was ultimately published as RFC 9587.
Authors Acee Lindem , Sharmila Palani , Yingzhen Qu
Last updated 2024-06-07 (Latest revision 2024-02-02)
Replaces draft-acee-lsr-ospfv3-extended-lsa-yang
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status Proposed Standard
Formats
Yang Validation 0 errors, 0 warnings
Reviews
Additional resources Yang catalog entry for ietf-ospfv3-extended-lsa@2020-10-01.yang
Yang impact analysis for draft-ietf-lsr-ospfv3-extended-lsa-yang
Mailing list discussion
Stream WG state Submitted to IESG for Publication
Associated WG milestone
Jan 2024
SUBMITTED: YANG Model for OSPFv3 Extended LSAs
Document shepherd Christian Hopps
Shepherd write-up Show Last changed 2024-01-10
IESG IESG state Became RFC 9587 (Proposed Standard)
Action Holders
(None)
Consensus boilerplate Yes
Telechat date (None)
Responsible AD John Scudder
Send notices to Christian Hopps <chopps@chopps.org>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
IANA expert review state Expert Reviews OK
draft-ietf-lsr-ospfv3-extended-lsa-yang-29
Internet                                                       A. Lindem
Internet-Draft                                   LabN Consulting, L.L.C.
Intended status: Standards Track                               S. Palani
Expires: 5 August 2024                                         Microsoft
                                                                   Y. Qu
                                                  Futurewei Technologies
                                                         2 February 2024

                  YANG Model for OSPFv3 Extended LSAs
               draft-ietf-lsr-ospfv3-extended-lsa-yang-29

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 5 August 2024.

Copyright Notice

   Copyright (c) 2024 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents (https://trustee.ietf.org/
   license-info) in effect on the date of publication of this document.
   Please review these documents carefully, as they describe your rights
   and restrictions with respect to this document.  Code Components
   extracted from this document must include Revised BSD License text as
   described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   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.  Normative References  . . . . . . . . . . . . . . . . . . . .  26
   9.  Informative References  . . . . . . . . . . . . . . . . . . .  28
   Appendix A.  Configuration Example  . . . . . . . . . . . . . . .  28
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  29

1.  Overview

   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 augmenting the IETF OSPF YANG
   model [RFC9129], 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].

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[RFC9129] which defines basic OSPF configuration and state.
   The OSPF YANG model augments the ietf-routing YANG model defined in
   [RFC8349].  The augmentations defined in the ietf-ospfv3-extended-lsa
   YANG module 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 metric?           ospf:ospf-metric
             |  +--ro prefix?           inet:ip-prefix
             |  +--ro prefix-options
             |  |  +--ro prefix-options*   identityref
             |  +--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 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 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 interface-id?            uint32
       |        +--ro neighbor-interface-id?   uint32
       |        +--ro neighbor-router-id?      rt-types:router-id
       |        +--ro type?                    ospf:router-link-type
       |        +--ro metric?                  ospf:ospf-link-metric
       |        +--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
       |  +--ro e-network-tlvs* []
       |     +--ro unknown-tlv
       |     |  +--ro type?     uint16

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       |     |  +--ro length?   uint16
       |     |  +--ro value?    yang:hex-string
       |     +--ro attached-router-tlv
       |        +--ro adjacent-neighbor-router-id*   rt-types:router-id
       +--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 flags
       |        |  +--ro ospfv3-e-external-prefix-bits*   identityref
       |        +--ro metric?           ospf:ospf-metric
       |        +--ro prefix?           inet:ip-prefix
       |        +--ro prefix-options
       |        |  +--ro prefix-options*   identityref
       |        +--ro sub-tlvs* []
       |           +--ro ipv6-fwd-addr-sub-tlv
       |           |  +--ro forwarding-address?   inet:ipv6-address
       |           +--ro ipv4-fwd-addr-sub-tlv
       |           |  +--ro forwarding-address?   inet:ipv4-address
       |           +--ro route-tag-sub-tlv
       |           |  +--ro route-tag?   uint32
       |           +--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 metric?           ospf:ospf-metric
       |        +--ro prefix?           inet:ip-prefix
       |        +--ro prefix-options
       |        |  +--ro prefix-options*   identityref
       |        +--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

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       |     |  +--ro length?   uint16
       |     |  +--ro value?    yang:hex-string
       |     +--ro inter-router-tlv
       |        +--ro lsa-options
       |        |  +--ro lsa-options*   identityref
       |        +--ro metric?                  ospf:ospf-metric
       |        +--ro destination-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-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 metric?           ospf:ospf-metric
                +--ro prefix?           inet:ip-prefix
                +--ro prefix-options
                |  +--ro prefix-options*   identityref
                +--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 flags
                |  +--ro ospfv3-e-external-prefix-bits*   identityref
                +--ro metric?           ospf:ospf-metric
                +--ro prefix?           inet:ip-prefix
                +--ro prefix-options

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                |  +--ro prefix-options*   identityref
                +--ro sub-tlvs* []
                   +--ro ipv6-fwd-addr-sub-tlv
                   |  +--ro forwarding-address?   inet:ipv6-address
                   +--ro ipv4-fwd-addr-sub-tlv
                   |  +--ro forwarding-address?   inet:ipv4-address
                   +--ro route-tag-sub-tlv
                   |  +--ro route-tag?   uint32
                   +--ro unknown-sub-tlv
                      +--ro type?     uint16
                      +--ro length?   uint16
                      +--ro value?    yang:hex-string

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@2024-02-02.yang"
   module ietf-ospfv3-extended-lsa {
     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 9129: A YANG Data Model for OSPF Protocol";
     }

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     organization
       "IETF LSR - Link State Routing Working Group";
     contact
       "WG Web:   <https://datatracker.ietf.org/wg/lsr/>
        WG List:  <mailto:lsr@ietf.org>

        Author:   Acee Lindem
                  <mailto:acee.ietf@gmail.com>
        Author:   Sharmila Palani
                  <mailto:sharmila.palani@microsoft.com>
        Author:   Yingzhen Qu
                  <mailto:yingzhen.ietf@gmail.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 are
        described in RFC 8362. OSPFv3 Extended LSAs provide extensible
        TLV-based LSAs for the base LSA types defined in RFC 5340.

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

        Copyright (c) 2024 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.";

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

     revision 2024-02-02 {
       description
         "Initial revision.";
       reference
         "RFC XXXX: YANG Data Model for OSPFv3 Extended LSAs.";
     }

     /*

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      * OSPFv3 Extended 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;
       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 4.4";
     }

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     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 {
       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

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         "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
          RFC 5340: OSPF for IPv6, Appendix A.4.1.1";
     }

     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
          RFC 5340: OSPF for IPv6, Appendix A.4.1.1";
     }

     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
          RFC 5340: OSPF for IPv6, Appendix A.4.1.1";
     }

     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)

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          Extensibility, Section 3.1
          RFC 5340: OSPF for IPv6, Appendix A.4.1.1";
     }

     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
          RFC 5340: OSPF for IPv6, Appendix A.4.1.1";
     }

     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 the E-bit is set, the metric specified is a Type 2
          external metric. This means the metric is considered larger
          than any intra-AS path.  When the E-bit is clear, the
          specified metric is a Type 1 external metric.  This means
          that it is expressed in the same units as other LSAs (i.e.,
          the same units as the interface costs in router-LSAs).";
       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";
       }
       reference
         "RFC 8362: OSPFv3 Link State Advertisement (LSA)
          Extensibility, Section 3";
     }

     grouping external-prefix-tlv {
       container external-prefix-tlv {
         description
           "External Prefix LSA TLV";
         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 ospf:ospf-metric;

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           description
             "External Prefix Metric";
         }
         uses ospfv3-lsa-prefix;
         list sub-tlvs {
           description
             "External Prefix TLV Sub-TLVs";
           container ipv6-fwd-addr-sub-tlv {
             description
               "IPv6 Forwarding address Sub-TLV for E-AS-External and
                E-NSSA LSAs for the IPv6 address family.";
             leaf forwarding-address {
               type inet:ipv6-address;
               description
                 "IPv6 Forwarding Address";
             }
             reference
               "RFC 8362: OSPFv3 Link State Advertisement (LSA)
                Extensibility, Section 3.10";
           }
           container ipv4-fwd-addr-sub-tlv {
             description
               "IPv4 Forwarding address Sub-TLV for E-AS-External and
                E-NSSA LSAs for the IPv4 address family.";
             leaf forwarding-address {
               type inet:ipv4-address;
               description
                 "IPv4 Forwarding Address";
             }
             reference
               "RFC 8362: OSPFv3 Link State Advertisement (LSA)
                Extensibility, Section 3.11";
           }
           container route-tag-sub-tlv {
             description
               "Route Tag Sub-TLV";
             leaf route-tag {
               type uint32;
               description
                 "Route Tag";
             }
             reference
               "RFC 8362: OSPFv3 Link State Advertisement (LSA)
                Extensibility, Section 3.12";
           }
           uses unknown-sub-tlv;
         }
       }

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       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 metric {
           type ospf:ospf-metric;
           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 3.7";
     }

     grouping ipv6-link-local-tlv {
       container ipv6-link-local-tlv {
         description
           "IPv6 Link-Local LSA TLV";
         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

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         "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 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";
     }

     /* 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 instance-level configuration
          with Extended LSA support. When enabled, OSPFv3 Extended LSAs
          will be advertised and OSPFv3 Legacy LSAs will not be
          advertised. When disabled, OSPFv3 Legacy LSAs will be
          advertised. However, OSPFv3 Extended LSAs could still be
          advertised in Extended LSA Sparse-Mode to support
          incrementally-deployed features as described insection 6.2 of
          RFC 8362.";
       leaf extended-lsa-support {
         type boolean;
         default "false";
         description
           "Enable OSPFv3 Extended LSA Support for the OSPFv3

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            domain";
         reference
           "RFC 8362 - OSPFv3 Link State Advertisement (LSA)
            Extensibility, Appendix A - Global Configuration Support";
       }
     }

     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 protocol area-level configuration
            when used.";
       }
       description
         "This augments the OSPFv3 protocol area-level
          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
              are flooded, disabling AreaExtendedLSASupport at the
              area level is prohibited when ExtendedLSASupport is
              enabled at the instance level. AS-External LSAs
              are flooded into all OSPFv3 regular areas  (i.e., not
              a stub or an NSSA area) and disabling support at the
              area level is not possible.";
         }
         description
           "This augments the OSPFv3 protocol area-level configuration
            with Extended LSA support. When enabled, OSPFv3 Extended
            LSAs will be advertised and OSPFv3 Legacy LSAs will not be
            advertised. When disabled, OSPFv3 Legacy LSAs will be
            advertised. However, OSPFv3 Extended LSAs could still be
            advertised in Extended LSA Sparse-Mode to support
            incrementally-deployed features as described insection
            6.2 of RFC 8362. 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 - Area Configuration Support";
       }
     }

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     /*
      * 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
         "This augmentation adds OSPFv3 Link-Scoped Extended LSAs
          to the operational state for an interface Link State
          Database (LSDB).";
       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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         }
       }
     }

     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
         "This augmentation adds OSPFv3 Area-Scoped Extended LSAs
          to the operational state for an area Link State
          Database (LSDB).";
       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 interface-id {
               type uint32;

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               description
                 "Interface ID for link";
             }
             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 ospf:ospf-link-metric;
               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

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             "E-Network LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description
               "Unknown E-Network TLV";
           }
           container attached-router-tlv {
             description
               "Attached Router TLV";
             leaf-list adjacent-neighbor-router-id {
               type rt-types:router-id;
               description
                 "Adjacent Neighbor's Router ID";
             }
           }
         }
       }
       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";
       }
       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

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           "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 metric {
               type ospf:ospf-metric;
               description
                 "Inter-Area Prefix Metric";
             }
             uses ospfv3-lsa-prefix;
             list sub-tlvs {
               description
                 "Inter-Area Prefix TLV Sub-TLVs";
               uses unknown-sub-tlv;
             }
           }
         }
       }
       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

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               "Unknown E-Inter-Area-Router LSA TLV";
             uses ospf:ospfv3-lsa-options;
             leaf metric {
               type ospf:ospf-metric;
               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
             "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

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             "E-Intra-Area-Prefix LSA TLVs";
           container unknown-tlv {
             uses ospf:tlv;
             description
               "Unknown E-Intra-Area-Prefix TLV";
           }
           uses intra-area-prefix-tlv;
         }
       }
     }

     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
         "This augmentation adds OSPFv3 AS-Scoped Extended LSAs
          to the operational state for an AS instance-level Link
          State Database (LSDB).";
       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)
            Extensibility, Section 4.5";
       }

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     }
   }
   <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 [RFC8341] 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.  There
   are the subtrees and data nodes and their sensitivity/vulnerability:

      /ospf:ospf/extended-lsa-support
      /ospf:ospf/ospf:areas/ospf:area/extended-lsa-support

   The ability to disable or enable OSPFv3 Extended LSA support can
   result in a Denial of Service (DoS) attack since OSPFv3 routers will
   use solely OSPFv3 Extended LSAs or OSPFv3 Legacy LSAs for the OSPFv3
   SPF computation.  OSPFv3 routers using different types of LSAs will
   result in incomplete reachability and possible partioning of the
   OSPFv3 routing domain.  Refer to section 6 of [RFC8362] for more
   information on OSPFv3 Extended LSA compatibility.

   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
   of the network.  This includes topological information from other
   routers.  This may be undesirable due to the fact that exposure may
   facilitate other attacks.  Additionally, network operators may
   consider their topologies to be sensitive confidential data.

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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

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

   Thanks much to Tom Petch, Mahesh Jethanandani, Renato Westphal,
   Victoria Pritchard, Reshad Rahman, and Chris Hopps for their review
   and comments.

8.  Normative References

   [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>.

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   [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>.

   [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>.

   [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>.

   [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>.

   [RFC8341]  Bierman, A. and M. Bjorklund, "Network Configuration
              Access Control Model", STD 91, RFC 8341,
              DOI 10.17487/RFC8341, March 2018,
              <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, 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>.

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   [RFC9129]  Yeung, D., Qu, Y., Zhang, Z., Chen, I., and A. Lindem,
              "YANG Data Model for the OSPF Protocol", RFC 9129,
              DOI 10.17487/RFC9129, October 2022,
              <https://www.rfc-editor.org/info/rfc9129>.

9.  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>.

   [RFC8792]  Watsen, K., Auerswald, E., Farrel, A., and Q. Wu,
              "Handling Long Lines in Content of Internet-Drafts and
              RFCs", RFC 8792, DOI 10.17487/RFC8792, June 2020,
              <https://www.rfc-editor.org/info/rfc8792>.

Appendix A.  Configuration Example

   The following is an XML example using the YANG model for OSPFv3
   Extended LSAs.

   Note: '\' line wrapping per [RFC8792].

   <?xml version='1.0' encoding='UTF-8'?>
     <routing xmlns="urn:ietf:params:xml:ns:yang:ietf-routing">
       <router-id>192.0.2.1</router-id>
       <control-plane-protocols>
         <control-plane-protocol>
           <type xmlns:ospf="urn:ietf:params:xml:ns:yang:ietf-ospf">\
           ospf:ospfv3</type>
           <name>"OSPFv3"</name>
           <ospf xmlns="urn:ietf:params:xml:ns:yang:ietf-ospf">
             <extended-lsa-support xmlns="urn:ietf:params:xml:ns:yang:\
               ietf-ospfv3-extended-lsa">true</extended-lsa-support>
           </ospf>
         </control-plane-protocol>
       </control-plane-protocols>
     </routing>

   The following is the same example using JSON format.

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   {
     "routing": {
       "router-id": "192.0.2.1",
       "control-plane-protocols": {
         "control-plane-protocol": {
           "type": "ospf:ospfv3",
           "name": "\"OSPFv3\"",
           "ospf": {
             "extended-lsa-support": true
           }
         }
       }
     }
   }

Authors' Addresses

   Acee Lindem
   LabN Consulting, L.L.C.
   301 Midenhall Way
   Cary, NC 27513
   Email: acee.ietf@gmail.com

   Sharmila Palani
   Microsoft
   1 Microsoft Way
   Redmond, WA 98052
   Email: sharmila.palani@microsoft.com

   Yingzhen Qu
   Futurewei Technologies
   2330 Central Expressway
   Santa Clara, CA 95050
   United States of America
   Email: yingzhen.ietf@gmail.com

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