Restart Signaling for IS-IS

The information below is for an old version of the document
Document Type None Internet-Draft (lsr WG)
Last updated 2019-09-19 (latest revision 2019-09-18)
Replaces draft-ginsberg-isis-rfc5306bis
Stream IETF
Intended RFC status Proposed Standard
Expired & archived
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Additional URLs
- Mailing list discussion
Stream WG state (None)
Document shepherd Uma Chunduri
Shepherd write-up Show (last changed 2019-06-04)
IESG IESG state Unknown state
Consensus Boilerplate Yes
Telechat date
Responsible AD Alvaro Retana
Send notices to Uma Chunduri <>,

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document describes a mechanism for a restarting router to signal to its neighbors that it is restarting, allowing them to reestablish their adjacencies without cycling through the down state, while still correctly initiating database synchronization. This document additionally describes a mechanism for a router to signal its neighbors that it is preparing to initiate a restart while maintaining forwarding plane state. This allows the neighbors to maintain their adjacencies until the router has restarted, but also allows the neighbors to bring the adjacencies down in the event of other topology changes. This document additionally describes a mechanism for a restarting router to determine when it has achieved Link State Protocol Data Unit (LSP) database synchronization with its neighbors and a mechanism to optimize LSP database synchronization, while minimizing transient routing disruption when a router starts. This document obsoletes RFC 5306.


Les Ginsberg (
Paul Wells (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)