I-D ACTION:draft-ietf-ccamp-crankback-01.txt

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This draft is a work item of the Common Control and Measurement Plane Working Group of the IETF.

	Title		: Crankback Signaling Extensions for MPLS Signaling
	Author(s)	: A. Farrel
	Filename	: draft-ietf-ccamp-crankback-01.txt
	Pages		: 30
	Date		: 2004-2-2
	
In a distributed, constraint-based routing environment, the
   information used to compute a path may be out of date. This means
   that Multiprotocol Label Switching (MPLS) label switched path (LSP)
   setup requests may be blocked by links or nodes without sufficient
   resources. Crankback is a scheme whereby setup failure information is
   returned from the point of failure to allow new setup attempts to be
   made avoiding the blocked resources. Crankback can also be applied to
   LSP restoration to indicate the location of the failed link or node.

   This document specifies crankback signaling extensions for use in
   MPLS signaling using RSVP-TE as defined in 'RSVP-TE: Extensions to
   RSVP for LSP Tunnels', RFC3209, so that the LSP setup request can be
   retried on an alternate path that detours around blocked links or
   nodes. This offers significant improvements in the successful setup
   and recovery ratios for LSPs, especially in situations where a large
   number of setup requests are triggered at the same time.

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