Graceful BGP Session Shutdown
RFC 8326
Document | Type | RFC - Proposed Standard (March 2018; Errata) | |
---|---|---|---|
Authors | Pierre Francois , Bruno Decraene , Cristel Pelsser , Keyur Patel , Clarence Filsfils | ||
Last updated | 2020-01-21 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Reviews | |||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Chris Morrow | ||
Shepherd write-up | Show (last changed 2017-09-25) | ||
IESG | IESG state | RFC 8326 (Proposed Standard) | |
Action Holders |
(None)
|
||
Consensus Boilerplate | Yes | ||
Telechat date | |||
Responsible AD | Warren Kumari | ||
Send notices to | Christopher Morrow <christopher.morrow@gmail.com> | ||
IANA | IANA review state | IANA OK - Actions Needed | |
IANA action state | RFC-Ed-Ack |
Internet Engineering Task Force (IETF) P. Francois, Ed. Request for Comments: 8326 Individual Contributor Category: Standards Track B. Decraene, Ed. ISSN: 2070-1721 Orange C. Pelsser Strasbourg University K. Patel Arrcus, Inc. C. Filsfils Cisco Systems March 2018 Graceful BGP Session Shutdown Abstract This document standardizes a new well-known BGP community, GRACEFUL_SHUTDOWN, to signal the graceful shutdown of paths. This document also describes operational procedures that use this well-known 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 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/rfc8326. Francois, et al. Standards Track [Page 1] RFC 8326 Graceful BGP Session Shutdown March 2018 Copyright Notice Copyright (c) 2018 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 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Packet Loss upon Manual EBGP Session Shutdown . . . . . . . . 4 4. Procedure for EBGP Graceful Shutdown . . . . . . . . . . . . 4 4.1. Pre-configuration . . . . . . . . . . . . . . . . . . . . 5 4.2. Operations at Maintenance Time . . . . . . . . . . . . . 5 4.3. BGP Implementation Support for Graceful Shutdown . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 6 6. Security Considerations . . . . . . . . . . . . . . . . . . . 6 7. References . . . . . . . . . . . . . . . . . . . . . . . . . 6 7.1. Normative References . . . . . . . . . . . . . . . . . . 6 7.2. Informative References . . . . . . . . . . . . . . . . . 7 Appendix A. Alternative Techniques with Limited Applicability . 8 A.1. Multi-Exit Discriminator Tweaking . . . . . . . . . . . . 8 A.2. IGP Distance Poisoning . . . . . . . . . . . . . . . . . 8 Appendix B. Configuration Examples . . . . . . . . . . . . . . . 8 B.1. Cisco IOS XR . . . . . . . . . . . . . . . . . . . . . . 9 B.2. BIRD . . . . . . . . . . . . . . . . . . . . . . . . . . 9 B.3. OpenBGPD . . . . . . . . . . . . . . . . . . . . . . . . 10 Appendix C. Beyond EBGP Graceful Shutdown . . . . . . . . . . . 10 C.1. IBGP Graceful Shutdown . . . . . . . . . . . . . . . . . 10 C.2. EBGP Session Establishment . . . . . . . . . . . . . . . 10 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 12 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 12 Francois, et al. Standards Track [Page 2] RFC 8326 Graceful BGP Session Shutdown March 2018 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 reconfigurationShow full document text