Name: draft-ietf-ccamp-rsvp-restart-ext-00
Title: Extensions to GMPLS RSVP Graceful Restart
State: Active
Authors: Arun Satyanarayana, Reshad Rahman
Group: Common Control and Measurement Plane (ccamp)
Date: 2004-10-11
This document describes extensions to the RSVP Graceful Restart mechanisms
defined in [RFC 3473]. The extensions enable the recovery of RSVP signaling
state based on the Path message last sent by the node being restarted.
Previously defined Graceful Restart mechanisms, also called recovery from
nodal faults, permit recovery of signaling state from adjacent nodes when
the data plane has retained the associated forwarding state across a
restart. These mechanisms do not fully support signaling state recovery on
ingress nodes or recovery of all RSVP objects. The presented extensions use
the RSVP Hello extensions defined in [RFC 3209], and extensions for state
recovery on nodal faults defined in [RFC 3473]. With the presented
extensions the restarting node can recover all previously transmitted Path
state including the ERO and the downstream (outgoing) interface
identifiers. The extensions can also be used to recover signaling state
after the restart of an ingress node. The extensions optionally support the
use of Summary Refresh, defined in [RFC 2961], to reduce the number of
messages exchanged during the Recovery Phase when the restarting node has
recovered signaling state locally for one or more LSP's.
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