Graceful BGP session shutdown
draft-ietf-grow-bgp-gshut-13

Document Type Active Internet-Draft (grow WG)
Last updated 2017-12-14
Stream IETF
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Network Working Group                                   P. Francois, Ed.
Internet-Draft                                    Individual Contributor
Intended status: Standards Track                        B. Decraene, Ed.
Expires: June 17, 2018                                            Orange
                                                              C. Pelsser
                                                   Strasbourg University
                                                                K. Patel
                                                            Arrcus, Inc.
                                                             C. Filsfils
                                                           Cisco Systems
                                                       December 14, 2017

                     Graceful BGP session shutdown
                      draft-ietf-grow-bgp-gshut-13

Abstract

   This draft standardizes a new well-known BGP community
   GRACEFUL_SHUTDOWN to signal the graceful shutdown of paths.  This
   draft also describes operational procedures which use this community
   to reduce the amount of traffic lost when BGP peering sessions are
   about to be shut down deliberately, e.g. for planned maintenance.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 17, 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 June 17, 2018                 [Page 1]
Internet-Draft        Graceful BGP session shutdown        December 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Packet loss upon manual EBGP session shutdown . . . . . . . .   3
   4.  EBGP graceful shutdown procedure  . . . . . . . . . . . . . .   4
     4.1.  Pre-configuration . . . . . . . . . . . . . . . . . . . .   4
     4.2.  Operations at maintenance time  . . . . . . . . . . . . .   4
     4.3.  BGP implementation support for graceful shutdown  . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Alternative techniques with limited applicability  .   7
     A.1.  Multi Exit Discriminator tweaking . . . . . . . . . . . .   7
     A.2.  IGP distance Poisoning  . . . . . . . . . . . . . . . . .   7
   Appendix B.  Configuration Examples . . . . . . . . . . . . . . .   7
     B.1.  Cisco IOS XR  . . . . . . . . . . . . . . . . . . . . . .   7
     B.2.  BIRD  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
     B.3.  OpenBGPD  . . . . . . . . . . . . . . . . . . . . . . . .   8
   Appendix C.  Beyond EBGP graceful shutdown  . . . . . . . . . . .   9
     C.1.  IBGP graceful shutdown  . . . . . . . . . . . . . . . . .   9
     C.2.  EBGP session establishment  . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Routing changes in BGP can be caused by planned maintenance
   operations.  This document defines a well-known community [RFC1997],
   called GRACEFUL_SHUTDOWN, for the purpose of reducing the management
   overhead of gracefully shutting down BGP sessions.  The well-known
   community allows implementers to provide an automated graceful
   shutdown mechanism that does not require any router reconfiguration
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