http://www.rfc-editor.org/rfc/rfc4167.txt
RFC 4167: Graceful OSPF Restart Implementation Report, A. Lindem2005-10-01T23:00:00-00:00Graceful OSPF Restart, as specified in RFC 3623, provides a mechanism whereby an OSPF router can stay on the forwarding path even as its OSPF software is restarted. This document provides an implementation report for this extension to the base OSPF protocol. This memo provides information for the Internet community.