Crankback Signaling Extensions for MPLS Signaling
draft-iwata-mpls-crankback-07
| Document | Type |
Expired Internet-Draft
(individual)
Expired & archived
|
|
|---|---|---|---|
| Authors | Adrian Farrel , Atsushi Iwata | ||
| Last updated | 2003-10-15 | ||
| RFC stream | (None) | ||
| Intended RFC status | (None) | ||
| Formats | |||
| Stream | Stream state | (No stream defined) | |
| Consensus boilerplate | Unknown | ||
| RFC Editor Note | (None) | ||
| IESG | IESG state | Expired | |
| Telechat date | (None) | ||
| Responsible AD | (None) | ||
| Send notices to | (None) |
This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:
Abstract
In a distributed, constraint-based routing environment, the information used to compute a path may be out of date.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.
Authors
(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)