Network Working Group D. Li
Request for Comments: 5495 J. Gao
Category: Informational Huawei
A. Satyanarayana
Cisco
S. Bardalai
Fujitsu
March 2009
Description of the
Resource Reservation Protocol - Traffic-Engineered (RSVP-TE)
Graceful Restart Procedures
Status of This Memo
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Li, et al. Informational [Page 1]RFC 5495 RSVP-TE Graceful Restart Procedures February 2009Abstract
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) networks for state recovery of control channel or nodal
faults.
The GMPLS protocol definitions for RSVP also allow a restarting node
to learn which label it previously allocated for use on a Label
Switched 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.
Li, et al. Informational [Page 2]RFC 5495 RSVP-TE Graceful Restart Procedures February 2009Table of Contents
1. Introduction ....................................................3
2. Existing Procedures for Single Node Restart .....................4
2.1. Procedures Defined in RFC 3473 .............................4
2.2. Procedures Defined in RFC 5063 .............................5
3. Multiple Node Restart Scenarios .................................6
4. RSVP State ......................................................7
5. Procedures for Multiple Node Restart ............................7
5.1. Procedures for the Normal Node .............................8
5.2. Procedures for the Restarting Node .........................8
5.2.1. Procedures for Scenario 1 ...........................8
5.2.2. Procedures for Scenario 2 ...........................9
5.2.3. Procedures for Scenario 3 ..........................11
5.2.4. Procedures for Scenario 4 ..........................12
5.2.5. Procedures for Scenario 5 ..........................12
5.3. Consideration of the Reuse of Data Plane Resources ........12
5.4. Consideration of Management Plane Intervention ............13
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