Graceful Restart Mechanism for BGP
RFC 4724, “Graceful Restart Mechanism for BGP”, is a Proposed Standard document published in January 2007 by S. Sangli, E. Chen, R. Fernando, J. Scudder, Y. Rekhter. It updates RFC 4271. It has since been updated by RFC 8538. The canonical text is published by the RFC Editor.
Abstract
This document describes a mechanism for BGP that would help minimize the negative effects on routing caused by BGP restart. An End-of-RIB marker is specified and can be used to convey routing convergence information. A new BGP capability, termed "Graceful Restart Capability", is defined that would allow a BGP speaker to express its ability to preserve forwarding state during BGP restart. Finally, procedures are outlined for temporarily retaining routing information across a TCP session termination/re-establishment.
The mechanisms described in this document are applicable to all routers, both those with the ability to preserve forwarding state during BGP restart and those without (although the latter need to implement only a subset of the mechanisms described in this document). [STANDARDS-TRACK]
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 4724 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 4721 Mobile IPv4 Challenge/Response Extensions
- RFC 4728 The Dynamic Source Routing Protocol for Mobile Ad Hoc Networks for IPv4
- RFC 4745 Common Policy: A Document Format for Expressing Privacy Preferences
- RFC 4753 ECP Groups For IKE and IKEv2
- RFC 4754 IKE and IKEv2 Authentication Using the Elliptic Curve Digital Signature Algorithm
- RFC 4760 Multiprotocol Extensions for BGP-4
- RFC 4761 Virtual Private LAN Service Using BGP for Auto-Discovery and Signaling
- RFC 4762 Virtual Private LAN Service Using Label Distribution Protocol Signaling