RFC 3137 (rfc3137) - Page 1 of 5
OSPF Stub Router Advertisement
Alternative Format: Original Text Document
Network Working Group A. Retana
Request for Comments: 3137 L. Nguyen
Category: Informational R. White
Cisco Systems
A. Zinin
Nexsi Systems
D. McPherson
Amber Networks
June 2001
OSPF Stub Router Advertisement
Status of this Memo
This memo provides information for the Internet community. It does
not specify an Internet standard of any kind. Distribution of this
memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
This memo describes a backward-compatible technique that may be used
by OSPF (Open Shortest Path First) implementations to advertise
unavailability to forward transit traffic or to lower the preference
level for the paths through such a router. In some cases, it is
desirable not to route transit traffic via a specific OSPF router.
However, OSPF does not specify a standard way to accomplish this.
1. Motivation
In some situations, it may be advantageous to inform routers in a
network not to use a specific router as a transit point, but still
route to it. Possible situations include the following.
o The router is in a critical condition (for example, has very
high CPU load or does not have enough memory to store all LSAs
or build the routing table).
o Graceful introduction and removal of the router to/from the
network.
o Other (administrative or traffic engineering) reasons.
Retana, et al. Informational
