A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : U-turn Alternates for IP/LDP Local Protection
Author(s) : A. Atlas
Filename : draft-atlas-ip-local-protect-uturn-02.txt
Pages : 28
Date : 2005-2-22
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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