http://www.rfc-editor.org/rfc/rfc5306.txt
RFC 5306: Restart Signaling for IS-IS, M. Shand, L. Ginsberg2008-10-01T23:00:00-00:00This 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 3847. [STANDARDS-TRACK]