I-D Action:draft-ietf-ccamp-gr-description-04.txt

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This draft is a work item of the Common Control and Measurement Plane Working Group of the IETF.


	Title           : Description of the RSVP-TE Graceful Restart Procedures
	Author(s)       : D. Li, et al.
	Filename        : draft-ietf-ccamp-gr-description-04.txt
	Pages           : 19
	Date            : 2009-01-20

The Hello message for the Resource Reservation Protocol (RSVP) has 
been defined to establish and maintain basic signaling node 
adjacencies for Label Switching Routers (LSRs) participating in a 
Multiprotocol Label Switching (MPLS) traffic engineered (TE) 
network. The Hello message has been extended for use in Generalized 
MPLS (GMPLS) network for state recovery of control channel or nodal 
faults. 

 
 
 GMPLS protocol definitions for RSVP also allow a restarting node to 
learn the label that it previously allocated for use on a Label 
Switching Path (LSP). 

Further RSVP protocol extensions have been defined to enable a 
restarting node to recover full control plane state by exchanging 
RSVP messages with its upstream and downstream neighbors.  

This document provides an informational clarification of the 
control plane procedures for a GMPLS network when there are 
multiple node failures, and describes how full control plane state 
can be recovered in different scenarios where the order in which 
the nodes restart is different. 

This document does not define any new processes or procedures. All 
protocol mechanisms are already defined in the referenced documents.

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