OSPF LLS Extensions for Local Interface ID Advertisement
draft-ppsenak-ospf-lls-interface-id-00

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Last updated 2017-02-15
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Open Shortest Path First IGP                              P. Psenak, Ed.
Internet-Draft                                             K. Talaulikar
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: August 19, 2017                                   W. Henderickx
                                                                   Nokia
                                                       P. Pillay-Esnault
                                                                  Huawei
                                                       February 15, 2017

        OSPF LLS Extensions for Local Interface ID Advertisement
                 draft-ppsenak-ospf-lls-interface-id-00

Abstract

   This draft describes the extensions to OSPF link-local signaling to
   advertise Local Interface Identifier.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

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

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   This Internet-Draft will expire on August 19, 2017.

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   Copyright (c) 2017 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

Psenak, et al.           Expires August 19, 2017                [Page 1]
Internet-Draft    OSPF LLS Extensions for Interface ID     February 2017

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   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Interface ID Exchange using TE Opaque LSA . . . . . . . . . .   2
   3.  Interface ID Exchange using OSPF LLS  . . . . . . . . . . . .   3
     3.1.  Local Interface Identifier TLV  . . . . . . . . . . . . .   3
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   6.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   4
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   Local/Remote Interface Identifiers are flooded by OSPF [RFC2328] as
   defined in [RFC4203].  From the perspective of the advertising
   router, the Local Interface Identifier is a known value, however the
   Remote Interface Identifier needs to be learnt before it can be
   advertised.  [RFC4203] suggests to use TE Link Local LSA [RFC3630] to
   communicate Local Interface Identifier to neighbors on the link.
   Though such mechanism works, it has some drawbacks.

   This draft proposes an extension to OSPF link-local signaling (LLS)
   [RFC5613] to advertise the Local Interface Identifier.

2.  Interface ID Exchange using TE Opaque LSA

   Usage of the Link Local TE Opaque LSA to propagate the Local
   Interface Identifier to the neighbors on the link is described in
   [RFC4203].  This mechanism has following problems:

      LSAs can only be flooded over an existing adjacency that is in
      Exchange state or greater.  The adjacency state machine progresses
      independently on each side of the adjacency and, as such, may
      reach the Full state on one side before the TE Link Opaque LSA
      arrives.  The consequence is that link can be initially advertised
      without the Remote Interface Identifier.  Later when the TE Link
      Opaque LSA arrives, the link must be advertised again, this time
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