OSPF Prefix Originator Extensions
draft-ietf-lsr-ospf-prefix-originator-06

Document Type Active Internet-Draft (lsr WG)
Last updated 2020-06-30
Replaces draft-wang-lsr-ospf-prefix-originator-ext
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LSR Working Group                                                A. Wang
Internet-Draft                                             China Telecom
Intended status: Standards Track                               A. Lindem
Expires: January 1, 2021                                   Cisco Systems
                                                                 J. Dong
                                                     Huawei Technologies
                                                               P. Psenak
                                                           K. Talaulikar
                                                           Cisco Systems
                                                           June 30, 2020

                   OSPF Prefix Originator Extensions
                draft-ietf-lsr-ospf-prefix-originator-06

Abstract

   This document defines OSPF extensions to include information
   associated with the node originating a prefix along with the prefix
   advertisement.

Status of This Memo

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   This Internet-Draft will expire on January 1, 2021.

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   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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Wang, et al.             Expires January 1, 2021                [Page 1]
Internet-Draft      OSPF Prefix Originator Extensions          June 2020

   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Extensions . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Prefix Source Router-ID Sub-TLV . . . . . . . . . . . . .   4
     2.2.  Prefix Originator Sub-TLV . . . . . . . . . . . . . . . .   4
   3.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   6.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  Inter-Area Topology Retrieval Process  . . . . . . .   9
   Appendix B.  Special Considerations on Inter-Area Topology
                Retrieval  . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Prefix attributes are advertised in OSPFv2 [RFC2328] using the
   Extended Prefix Opaque Link State Advertisement (LSA) [RFC7684] and
   in OSPFv3 [RFC5340] using the various Extended Prefix LSA types
   [RFC8362].

   The identification of the originating router for a prefix in OSPF
   varies by the type of the prefix and is currently not always
   possible.  For intra-area prefixes, the originating router is
   identified by the advertising Router ID field of the area-scoped LSA
   used for those prefix advertisements.  However, for the inter-area
   prefixes advertised by the Area Border Router (ABR), the advertising
   Router ID field of their area-scoped LSAs is set to the ABR itself
   and the information about the router originating the prefix
   advertisement is lost in this process of prefix propagation across
   areas.  For Autonomous System (AS) external prefixes, the originating
   router may be considered as the Autonomous System Border Router
   (ASBR) and is identified by the advertising Router ID field of the
   AS-scoped LSA used.  However, the actual originating router for the
   prefix may be a remote router outside the OSPF domain.  Similarly,
   when an ABR performs translation of Not-So-Stubby Area (NSSA)
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