Name: draft-ietf-ccamp-crankback-03
Title: Crankback Signaling Extensions for MPLS Signaling
State: Active
Authors: Adrian Farrel
Group: Common Control and Measurement Plane (ccamp)
Date: 2004-10-08
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used to compute a path may be out of date.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
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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