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GMPLS Segment Recovery
RFC 4873

Network Working Group                                          L. Berger
Request for Comments: 4873                               LabN Consulting
Updates: 3473, 4872                                           I. Bryskin
Category: Standards Track                                   ADVA Optical
                                                        D. Papadimitriou
                                                                 Alcatel
                                                               A. Farrel
                                                      Old Dog Consulting
                                                                May 2007

                         GMPLS Segment Recovery

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.

Copyright Notice

   Copyright (C) The IETF Trust (2007).

Abstract

   This document describes protocol specific procedures for GMPLS
   (Generalized Multi-Protocol Label Switching) RSVP-TE (Resource
   ReserVation Protocol - Traffic Engineering) signaling extensions to
   support label switched path (LSP) segment protection and restoration.
   These extensions are intended to complement and be consistent with
   the RSVP-TE Extensions for End-to-End GMPLS Recovery (RFC 4872).
   Implications and interactions with fast reroute are also addressed.
   This document also updates the handling of NOTIFY_REQUEST objects.

Berger, et al.              Standards Track                     [Page 1]
RFC 4873                 GMPLS Segment Recovery                 May 2007

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................3
   2. Segment Recovery ................................................4
      2.1. Segment Protection .........................................6
      2.2. Segment Re-routing and Restoration .........................6
   3. ASSOCIATION Object ..............................................6
      3.1. Format .....................................................7
      3.2. Procedures .................................................7
           3.2.1. Recovery Type Processing ............................7
           3.2.2. Resource Sharing Association Type Processing ........7
   4. Explicit Control of LSP Segment Recovery ........................8
      4.1. Secondary Explicit Route Object Format .....................8
           4.1.1. Protection Subobject ................................8
      4.2. Explicit Control Procedures ................................9
           4.2.1. Branch Failure Handling ............................10
           4.2.2. Resv Message Processing ............................11
           4.2.3. Admin Status Change ................................12
           4.2.4. Recovery LSP Teardown ..............................12
      4.3. Teardown From Non-Ingress Nodes ...........................12
           4.3.1. Modified NOTIFY_REQUEST Object Processing ..........13
           4.3.2. Modified Notify and Error Message Processing .......14
   5. Secondary Record Route Objects .................................14
      5.1. Format ....................................................14
      5.2. Path Processing ...........................................15
      5.3. Resv Processing ...........................................15
   6. Dynamic Control of LSP Segment Recovery ........................16
      6.1. Modified PROTECTION Object Format .........................16
      6.2. Dynamic Control Procedures ................................17
   7. Updated RSVP Message Formats ...................................18
   8. Security Considerations ........................................20
   9. IANA Considerations ............................................21
      9.1. New Association Type Assignment ...........................21
      9.2. Definition of PROTECTION Object Reserved Bits .............21
      9.3. Secondary Explicit Route Object ...........................21
      9.4. Secondary Record Route Object .............................21
      9.5. New Error Code ............................................22
      9.6. Use of PROTECTION Object C-type ...........................22
   10. References ....................................................23
      10.1. Normative References .....................................23
      10.2. Informative References ...................................23

Berger, et al.              Standards Track                     [Page 2]

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