RFC 3623 (rfc3623) - Page 1 of 18
Graceful OSPF Restart
Alternative Format: Original Text Document
Network Working Group J. Moy
Request for Comments: 3623 Sycamore Networks
Category: Standards Track P. Pillay-Esnault
Juniper Networks
A. Lindem
Redback Networks
November 2003
Graceful OSPF Restart
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2003). All Rights Reserved.
Abstract
This memo documents an enhancement to the OSPF routing protocol,
whereby an OSPF router can stay on the forwarding path even as its
OSPF software is restarted. This is called "graceful restart" or
"non-stop forwarding". A restarting router may not be capable of
adjusting its forwarding in a timely manner when the network topology
changes. In order to avoid the possible resulting routing loops, the
procedure in this memo automatically reverts to a normal OSPF restart
when such a topology change is detected, or when one or more of the
restarting router's neighbors do not support the enhancements in this
memo. Proper network operation during a graceful restart makes
assumptions upon the operating environment of the restarting router;
these assumptions are also documented.
Moy, et al. Standards Track