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Support for Long-lived BGP Graceful Restart
draft-uttaro-idr-bgp-persistence-03

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Last updated: 2013-11-13
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Internet Engineering Task Force                                J. Uttaro
Internet-Draft                                                      AT&T
Intended status: Standards Track                                 E. Chen
Expires: May 17, 2014                                      Cisco Systems
                                                             B. Decraene
                                                                  Orange
                                                              J. Scudder
                                                        Juniper Networks
                                                       November 13, 2013

              Support for Long-lived BGP Graceful Restart
                  draft-uttaro-idr-bgp-persistence-03

Abstract

   In this document we introduce a new BGP capability termed "Long-lived
   Graceful Restart Capability" so that stale routes can be retained for
   a longer time upon session failure.  In addition a new BGP community
   "LLGR_STALE" is introduced for marking stale routes retained for a
   longer time.  We also specify that such long-lived stale routes be
   treated as the least-preferred, and their advertisements be limited
   to BGP speakers that have advertised the new capability.  Use of this
   extension is not advisable in all cases, and we provide guidelines to
   help determine if it is.

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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   Internet-Drafts are draft documents valid for a maximum of six months
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 17, 2014.

Uttaro, et al.            Expires May 17, 2014                  [Page 1]
Internet-Draft         Long-Lived Graceful Restart         November 2013

Copyright Notice

   Copyright (c) 2013 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol Extensions . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Long-lived Graceful Restart Capability  . . . . . . . . .   5
     3.2.  LLGR_STALE Community  . . . . . . . . . . . . . . . . . .   6
     3.3.  NO_LLGR Community . . . . . . . . . . . . . . . . . . . .   7
   4.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Use of Graceful Restart Capability  . . . . . . . . . . .   7
     4.2.  Session Resets  . . . . . . . . . . . . . . . . . . . . .   7
     4.3.  Processing LLGR_STALE Routes  . . . . . . . . . . . . . .  10
     4.4.  Route Selection . . . . . . . . . . . . . . . . . . . . .  10
     4.5.  Multicast VPN . . . . . . . . . . . . . . . . . . . . . .  10
     4.6.  Errors  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     4.7.  Optional Partial Deployment Procedure . . . . . . . . . .  13
     4.8.  Procedures When BGP is the PE-CE Protocol in a VPN  . . .  13
   5.  Deployment Considerations . . . . . . . . . . . . . . . . . .  14
     5.1.  When BGP is the PE-CE Protocol in a VPN . . . . . . . . .  15
     5.2.  Risks of Depreferencing Routes  . . . . . . . . . . . . .  16
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   7.  Examples of Operation . . . . . . . . . . . . . . . . . . . .  18
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  20
   9.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  20
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  21
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  22

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