Notification Message support for BGP Graceful Restart
draft-ietf-idr-bgp-gr-notification-02
Network Working Group K. Patel
Internet-Draft R. Fernando
Intended status: Standards Track Cisco Systems
Expires: November 17, 2014 J. Scudder
J. Haas
Juniper Networks
May 16, 2014
Notification Message support for BGP Graceful Restart
draft-ietf-idr-bgp-gr-notification-02.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.
This document also defines a new BGP NOTIFICATION Cease Error subcode
to prevent BGP speakers supporting the extension defined in this
document from performing a Graceful Restart.
Status of This Memo
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This Internet-Draft will expire on November 17, 2014.
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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 . . . . . . . . . . . . . . . . . 5
4. Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 5
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. This permits the BGP speaker to avoid flapping
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