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 and GMPLS RSVP-TE
Author(s) : A. Farrel, et al.
Filename : draft-ietf-ccamp-crankback-05.txt
Pages : 33
Date : 2005-5-24
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information used to compute a path may be out of date.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) and Generalized MPLS
(GMPLS) Traffic Engineered (TE) 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 recovery 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, and GMPLS signaling as defined in
"Generalized Multi-Protocol Label Switching (GMPLS) Signaling
Functional Description", RFC3473. These extensions mean 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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