Graceful BGP session shutdown
draft-ietf-grow-bgp-gshut-10

Document Type Active Internet-Draft (grow WG)
Last updated 2017-07-28
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Network Working Group                                   P. Francois, Ed.
Internet-Draft                                    Individual Contributor
Intended status: Informational                          B. Decraene, Ed.
Expires: January 28, 2018                                         Orange
                                                              C. Pelsser
                                                   Strasbourg University
                                                                K. Patel
                                                            Arrcus, Inc.
                                                             C. Filsfils
                                                           Cisco Systems
                                                           July 27, 2017

                     Graceful BGP session shutdown
                      draft-ietf-grow-bgp-gshut-10

Abstract

   This draft describes operational procedures aimed at reducing the
   amount of traffic lost during planned maintenances of routers or
   links, involving the shutdown of BGP peering sessions.  It defines a
   well-known BGP community, called GRACEFUL_SHUTDOWN, to signal the
   graceful shutdown of paths.

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
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   This Internet-Draft will expire on January 28, 2018.

Copyright Notice

   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

Francois, et al.        Expires January 28, 2018                [Page 1]
Internet-Draft        Graceful BGP session shutdown            July 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Packet loss upon manual EBGP session shutdown . . . . . . . .   4
   4.  Practices to avoid packet losses  . . . . . . . . . . . . . .   4
     4.1.  Improving availability of alternate paths . . . . . . . .   4
     4.2.  Make before break convergence: graceful shutdown  . . . .   5
     4.3.  Forwarding modes and transient forwarding loops during
           convergence . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  EBGP graceful shutdown procedure  . . . . . . . . . . . . . .   5
     5.1.  Pre-configuration . . . . . . . . . . . . . . . . . . . .   5
     5.2.  Operations at maintenance time  . . . . . . . . . . . . .   6
     5.3.  BGP implementation support for graceful shutdown  . . . .   6
   6.  Beyond EBGP graceful shutdown . . . . . . . . . . . . . . . .   7
     6.1.  IBGP graceful shutdown  . . . . . . . . . . . . . . . . .   7
     6.2.  EBGP session establishment  . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Appendix A.  Alternative techniques with limited applicability  .  10
     A.1.  Multi Exit Discriminator tweaking . . . . . . . . . . . .  10
     A.2.  IGP distance Poisoning  . . . . . . . . . . . . . . . . .  10
   Appendix B.  Configuration Examples . . . . . . . . . . . . . . .  10
     B.1.  Cisco IOS XR  . . . . . . . . . . . . . . . . . . . . . .  11
     B.2.  BIRD  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
     B.3.  OpenBGPD  . . . . . . . . . . . . . . . . . . . . . . . .  11
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