Extensions to GMPLS Resource Reservation Protocol (RSVP) Graceful Restart
RFC 5063
Network Working Group A. Satyanarayana, Ed.
Request for Comments: 5063 R. Rahman, Ed.
Updates: 2961, 3473 Cisco Systems
Category: Standards Track October 2007
Extensions to GMPLS Resource Reservation Protocol (RSVP)
Graceful Restart
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Abstract
This document describes extensions to the Resource Reservation
Protocol (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. Those mechanisms do not fully support
signaling state recovery on ingress nodes or recovery of all RSVP
objects.
The extensions defined in this document build on the RSVP Hello
extensions defined in RFC 3209, and extensions for state recovery on
nodal faults defined in RFC 3473. Using these extensions, the
restarting node can recover all previously transmitted Path state,
including the Explicit Route Object and the downstream (outgoing)
interface identifiers. The extensions can also be used to recover
signaling state after the restart of an ingress node.
These extensions are not used to create or restore data plane state.
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 Label Switched Paths (LSPs).
Satyanarayana & Rahman Standards Track [Page 1]
RFC 5063 GMPLS RSVP Graceful Restart Extensions October 2007
Table of Contents
1. Introduction ....................................................3
2. Conventions Used in This Document ...............................5
3. Terminology .....................................................5
4. Extensions to Nodal Fault Handling ..............................5
4.1. RecoveryPath Message Format ................................5
4.2. Capability Object ..........................................6
4.2.1. Conformance .........................................7
4.3. Related Procedures .........................................7
4.4. Procedures for the Capability Object .......................8
4.4.1. Procedures for the Downstream Neighbor ..............8
4.4.2. Procedures for the Restarting Node ..................8
4.5. Procedures for the RecoveryPath Message ....................9
4.5.1. Procedures for the Downstream Neighbor ..............9
4.5.2. Procedures for the Restarting Node .................10
4.5.2.1. Path and RecoveryPath Message Procedures ..11
4.5.2.2. Re-Synchronization Procedures .............12
4.5.2.3. Procedures on Expiration of
Recovery Period ...........................13
4.6. Compatibility .............................................13
5. RecoveryPath Summary Refresh ...................................14
5.1. MESSAGE_ID ACK/NACK and MESSAGE_ID LIST Objects ...........15
5.2. RecoveryPath Srefresh Capable Bit .........................16
5.2.1. Procedures .........................................16
5.2.2. Compatibility ......................................17
5.3. RecoveryPath Summary Refresh Procedures ...................17
5.3.1. Generation of RecoveryPath-Related Srefresh
Messages ...........................................17
5.3.2. RecoveryPath-Related Srefresh Receive
Processing and NACK Generation .....................19
5.3.3. RecoveryPath-Related MESSAGE_ID NACK
Receive Processing .................................19
6. Security Considerations ........................................20
7. Acknowledgments ................................................21
8. IANA Considerations ............................................21
9. Normative References ...........................................22
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