Notification Message Support for BGP Graceful Restart
RFC 8538

Document Type RFC - Proposed Standard (March 2019; No errata)
Updates RFC 4724
Last updated 2019-03-08
Replaces draft-keyupate-idr-bgp-gr-notification
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Jie Dong
Shepherd write-up Show (last changed 2017-05-09)
IESG IESG state RFC 8538 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Alvaro Retana
Send notices to "Jie Dong" <jie.dong@huawei.com>, aretana.ietf@gmail.com
IANA IANA review state IANA OK - Actions Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                          K. Patel
Request for Comments: 8538                                        Arrcus
Updates: 4724                                                R. Fernando
Category: Standards Track                                  Cisco Systems
ISSN: 2070-1721                                               J. Scudder
                                                                 J. Haas
                                                        Juniper Networks
                                                              March 2019

         Notification Message Support for BGP Graceful Restart

Abstract

   The BGP Graceful Restart mechanism defined in RFC 4724 limits the
   usage of BGP Graceful Restart to BGP messages other than BGP
   NOTIFICATION messages.  This document updates RFC 4724 by defining an
   extension 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 subcode for
   BGP Cease NOTIFICATION messages; this new subcode requests a full
   session restart instead of a Graceful Restart.

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/rfc8538.

Patel, et al.                Standards Track                    [Page 1]
RFC 8538             Notification Support for BGP GR          March 2019

Copyright Notice

   Copyright (c) 2019 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
   (https://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  . . . . . . . . . . . . . . . . . . . . . . . .   3
     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 . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Rules for the Receiving Speaker . . . . . . . . . . . . .   6
   5.  Use of Hard Reset . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  When to Send a Hard Reset . . . . . . . . . . . . . . . .   7
     5.2.  Interaction with Other Specifications . . . . . . . . . .   7
   6.  Management Considerations . . . . . . . . . . . . . . . . . .   8
   7.  Operational Considerations  . . . . . . . . . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     10.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

Patel, et al.                Standards Track                    [Page 2]
RFC 8538             Notification Support for BGP GR          March 2019

1.  Introduction

   For many classes of errors, BGP must send a NOTIFICATION message and
   reset the peering session to handle the error condition.  The BGP
   Graceful Restart mechanism 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 BGP.

   At a high level, this document can be summed up as follows.  When a
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