Notification Message support for BGP Graceful Restart
draft-ietf-idr-bgp-gr-notification-10

Document Type Active Internet-Draft (idr WG)
Last updated 2017-03-27
Replaces draft-keyupate-idr-bgp-gr-notification
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Internet Engineering Task Force                                 K. Patel
Internet-Draft                                                    Arrcus
Intended status: Standards Track                             R. Fernando
Expires: September 28, 2017                                Cisco Systems
                                                              J. Scudder
                                                                 J. Haas
                                                        Juniper Networks
                                                          March 27, 2017

         Notification Message support for BGP Graceful Restart
               draft-ietf-idr-bgp-gr-notification-10.txt

Abstract

   The current BGP Graceful Restart mechanism limits the usage of BGP
   Graceful Restart to BGP protocol messages other than a BGP
   NOTIFICATION message.  This document defines an extension to the BGP
   Graceful Restart that permits the Graceful Restart procedures to be
   performed when the BGP speaker receives a BGP NOTIFICATION Message or
   the Hold Time expires.  This document also defines a new BGP
   NOTIFICATION Cease Error subcode whose effect is to request a full
   session restart instead of a Graceful Restart.

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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   This Internet-Draft will expire on September 28, 2017.

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

Patel, et al.          Expires September 28, 2017               [Page 1]
Internet-Draft       Notification support for BGP GR          March 2017

   (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
   to this document.  Code Components extracted from this document must
   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 . . . . . . . . . . . . . . . . . .   3
   2.  Modifications to BGP Graceful Restart Capability  . . . . . .   3
   3.  BGP Hard Reset Subcode  . . . . . . . . . . . . . . . . . . .   4
     3.1.  Sending a Hard Reset  . . . . . . . . . . . . . . . . . .   4
     3.2.  Receiving a Hard Reset  . . . . . . . . . . . . . . . . .   4
   4.  Operation . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Rules for the Receiving Speaker . . . . . . . . . . . . .   5
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   For many classes of errors, the BGP protocol must send a NOTIFICATION
   message and reset the peering session to handle the error condition.
   The BGP Graceful Restart extension defined in [RFC4724] requires that
   normal BGP procedures defined in [RFC4271] be followed when a
   NOTIFICATION message is sent or received.  This document defines an
   extension to BGP Graceful Restart that permits the Graceful Restart
   procedures to be performed when the BGP speaker receives a
   NOTIFICATION message or the Hold Time expires.  This permits the BGP
   speaker to avoid flapping reachability and continue forwarding while
   the BGP speaker restarts the session to handle errors detected in the
   BGP protocol.

   At a high level, this document can be summed up as follows.  When a
   BGP session is reset, both speakers operate as "Receiving Speakers"
   according to [RFC4724], meaning they retain each other's routes.
   This is also true for HOLDTIME expiration.  The functionality can be
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