I-D ACTION:draft-martin-isis-local-protect-cap-01.txt

A New Internet-Draft is available from the on-line Internet-Drafts directories.

	Title		: ISIS Extensions for Signaling Local Protection Capabilities
	Author(s)	: A. Atlas, et al.
	Filename	: draft-martin-isis-local-protect-cap-01.txt
	Pages		: 7
	Date		: 2004-10-26

This document specifies additional information that can inserted in
IS-IS LSPs to convey link capabilities that may be useful in certain
applications.  In particular, an IS may indicate that zero or more of
its links may be used by an upstream IS as an alternate, SPT-disjoint
path to an arbitrary destination D.  Additionally, an IS may convey
that zero or more of its links are capable of breaking a U-turn,
which may be described as a single-hop forwarding loop between two
IS's.  This means that a router can detect the presence of a
forwarding loop by recognizing that traffic to a destination is being
received from a neighbor to which it has forwarding state pointing
back to the same neighbor for that destination.  In such a situation,
it will switch to a loop-free node-protecting alternate until new
primary forwarding state has been installed, thus breaking the U-turn.  Therefore, the immediate applicability for these two link capabilities is in support of local protection in the event of a link and/or node failure while the IS-IS area is reconverging onto a new topology.

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