OSPF Link-Local Signaling (LLS) Extensions for Local Interface ID Advertisement
RFC 8510
Internet Engineering Task Force (IETF) P. Psenak, Ed.
Request for Comments: 8510 K. Talaulikar
Category: Standards Track Cisco Systems, Inc.
ISSN: 2070-1721 W. Henderickx
Nokia
P. Pillay-Esnault
Huawei USA
January 2019
OSPF Link-Local Signaling (LLS) Extensions for
Local Interface ID Advertisement
Abstract
Every OSPF interface is assigned an Interface ID that uniquely
identifies the interface on the router. In some cases, it is useful
to know the assigned Interface ID on the remote side of the adjacency
(Remote Interface ID).
This document describes the extensions to OSPF link-local signaling
(LLS) to advertise the Local Interface ID.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8510.
Psenak, et al. Standards Track [Page 1]
RFC 8510 OSPF LLS Extensions for Interface ID January 2019
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Table of Contents
1. Introduction ....................................................3
1.1. Interface ID Exchange Using Link Local TE Opaque LSA .......4
1.2. Requirements Language ......................................4
2. Interface ID Exchange Using OSPF LLS ............................4
2.1. Local Interface ID TLV .....................................5
3. Backward Compatibility with RFC 4203 ............................5
4. IANA Considerations .............................................6
5. Security Considerations .........................................6
6. References ......................................................6
6.1. Normative References .......................................6
6.2. Informative References .....................................7
Acknowledgments ....................................................8
Authors' Addresses .................................................8
Psenak, et al. Standards Track [Page 2]
RFC 8510 OSPF LLS Extensions for Interface ID January 2019
1. Introduction
Every OSPF interface is assigned an Interface ID that uniquely
identifies the interface on the router. [RFC2328] uses this
Interface ID in the Router Link State Advertisement (Router-LSA) Link
Data for unnumbered links and uses the value of the MIB-II ifIndex
[RFC2863]. [RFC4203] refers to these Interface IDs as the Link
Local/Remote Identifiers and defines a way to advertise and use them
for GMPLS purposes. [RFC8379] defines a way to advertise Local/
Remote Interface IDs in the OSPFv2 Extended Link Opaque LSA.
There is a known OSPFv2 protocol problem in verifying the
bidirectional connectivity with parallel unnumbered links. If there
are two parallel unnumbered links between a pair of routers and each
link is only advertised from a single direction, such two
unidirectional parallel links could be considered as a valid single
bidirectional link during the OSPF route computation on some other
router. If each link is advertised with both its Local and Remote
Interface IDs, the advertisement of each link from both sides of
adjacency can be verified by cross-checking the Local and Remote
Interface IDs of both advertisements.
From the perspective of the advertising router, the Local Interface
ID is a known value. However, the Remote Interface ID needs to be
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