I-D ACTION:draft-iwata-mpls-crankback-02.txt

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	Title		: Crankback Routing Extensions for MPLS Signaling
	Author(s)	: A. Iwata, N. Fujita, G. Ash, A. Farrel
	Filename	: draft-iwata-mpls-crankback-02.txt
	Pages		: 31
	Date		: 27-Nov-01
	
This draft proposes crankback routing extensions for CR-LDP signaling
and for RSVP-TE signaling. Recently, several routing protocol
extensions for advertising resource information in addition to
topology information have been proposed for use in distributed
constraint-based routing. In such a distributed routing environment,
however, the information used to compute a constraint-based path may
be out of date. This means that LSP setup requests may be blocked by
links or nodes without sufficient resources. This draft specifies
crankback routing extensions for CR-LDP and RSVP-TE so that the label
request can be retried on an alternate path that detours around the
blocked link or node upon a setup failure. Furthermore, the crankback
routing schemes can also be applied to LSP restoration by indicating
the location of the failure link or node. This would significantly
improve the successful recovery ratio for failed LSPs, especially in
situations where a large number of setup requests are triggered at
the same time.

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