OSPF Graceful Link Shutdown
RFC 8379

Document Type RFC - Proposed Standard (May 2018; No errata)
Last updated 2018-05-11
Replaces draft-hegde-ospf-link-overload
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Acee Lindem
Shepherd write-up Show (last changed 2017-12-06)
IESG IESG state RFC 8379 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alvaro Retana
Send notices to Acee Lindem <acee@cisco.com>, aretana.ietf@gmail.com
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                          S. Hegde
Request for Comments: 8379                        Juniper Networks, Inc.
Category: Standards Track                                      P. Sarkar
ISSN: 2070-1721                                             Arrcus, Inc.
                                                              H. Gredler
                                                            RtBrick Inc.
                                                              M. Nanduri
                                                        ebay Corporation
                                                                L. Jalil
                                                                 Verizon
                                                                May 2018

                      OSPF Graceful Link Shutdown

Abstract

   When a link is being prepared to be taken out of service, the traffic
   needs to be diverted from both ends of the link.  Increasing the
   metric to the highest value on one side of the link is not sufficient
   to divert the traffic flowing in the other direction.

   It is useful for the routers in an OSPFv2 or OSPFv3 routing domain to
   be able to advertise a link as being in a graceful-shutdown state to
   indicate impending maintenance activity on the link.  This
   information can be used by the network devices to reroute the traffic
   effectively.

   This document describes the protocol extensions to disseminate
   graceful-link-shutdown information in OSPFv2 and OSPFv3.

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/rfc8379.

Hegde, et al.                Standards Track                    [Page 1]
RFC 8379               OSPF Graceful Link Shutdown              May 2018

Copyright Notice

   Copyright (c) 2018 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Flooding Scope  . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Protocol Extensions . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  OSPFv2 Graceful-Link-Shutdown Sub-TLV . . . . . . . . . .   4
     4.2.  Remote IPv4 Address Sub-TLV . . . . . . . . . . . . . . .   4
     4.3.  Local/Remote Interface ID Sub-TLV . . . . . . . . . . . .   5
     4.4.  OSPFv3 Graceful-Link-Shutdown Sub-TLV . . . . . . . . . .   6
     4.5.  BGP-LS Graceful-Link-Shutdown TLV . . . . . . . . . . . .   6
     4.6.  Distinguishing Parallel Links . . . . . . . . . . . . . .   7
   5.  Elements of Procedure . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Point-to-Point Links  . . . . . . . . . . . . . . . . . .   8
     5.2.  Broadcast/NBMA Links  . . . . . . . . . . . . . . . . . .   9
     5.3.  Point-to-Multipoint Links . . . . . . . . . . . . . . . .  10
     5.4.  Unnumbered Interfaces . . . . . . . . . . . . . . . . . .  10
     5.5.  Hybrid Broadcast and P2MP Interfaces  . . . . . . . . . .  10
   6.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .  10
   7.  Applications  . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Overlay Network . . . . . . . . . . . . . . . . . . . . .  11
     7.2.  Controller-Based Deployments  . . . . . . . . . . . . . .  12
     7.3.  L3VPN Services and Sham Links . . . . . . . . . . . . . .  13
     7.4.  Hub and Spoke Deployment  . . . . . . . . . . . . . . . .  13
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     10.2.  Informative References . . . . . . . . . . . . . . . . .  16
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