I-D ACTION:draft-atlas-ip-local-protect-uturn-03.txt

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	Title		: U-turn Alternates for IP/LDP Fast-Reroute
	Author(s)	: A. Atlas
	Filename	: draft-atlas-ip-local-protect-uturn-03.txt
	Pages		: 29
	Date		: 2006-3-7
	
This document defines and describes the use of U-turn alternates to
provide local protection for IP unicast and/or LDP traffic in the
event of a single failure, whether link, node or shared risk link
group (SRLG).  When a topology change occurs, a router S pre-computes
for each prefix an alternate next-hop that can be used if the primary
next-hop fails.  An acceptable alternate can be either a loop-free
alternate or a U-turn alternate.  A U-turn alternate uses a neighbor,
whose primary next-hop to the prefix is router S itself and which has
itself a loop-free node-protecting alternate, which thus does not go
through router S to reach the destination prefix.

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