A New Internet-Draft is available from the on-line Internet-Drafts directories.
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, et al.
Filename : draft-ietf-ccamp-crankback-03.txt
Pages : 31
Date : 2004-10-8
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information used to compute a path may be out of date.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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