Generalized Multi-Protocol Label Switching (GMPLS) Signaling Constraint-based Routed Label Distribution Protocol (CR-LDP) Extensions
RFC 3472

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Network Working Group                           P. Ashwood-Smith, Editor
Request for Comments: 3472                               Nortel Networks
Category: Standards Track                              L. Berger, Editor
                                                          Movaz Networks
                                                            January 2003

     Generalized Multi-Protocol Label Switching (GMPLS) Signaling
Constraint-based Routed Label Distribution Protocol (CR-LDP) Extensions

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 Internet Society (2003).  All Rights Reserved.

Abstract

   This document describes extensions to Multi-Protocol Label Switching
   (MPLS) Constraint-based Routed Label Distribution Protocol (CR-LDP)
   signaling required to support Generalized MPLS.  Generalized MPLS
   extends the MPLS control plane to encompass time-division (e.g.,
   Synchronous Optical Network and Synchronous Digital Hierarchy,
   SONET/SDH), wavelength (optical lambdas) and spatial switching (e.g.,
   incoming port or fiber to outgoing port or fiber).  This document
   presents a CR-LDP specific description of the extensions.  A generic
   functional description can be found in separate documents.

Table of Contents

   1.  Introduction  ..............................................   2
   2.  Label Related Formats   ....................................   3
    2.1  Generalized Label Request  ...............................   3
    2.2  Generalized Label  .......................................   4
    2.3  Waveband Switching  ......................................   5
    2.4  Suggested Label  .........................................   6
    2.5  Label Set  ...............................................   6
   3.  Bidirectional LSPs  ........................................   8
    3.1  Procedures  ..............................................   8
   4.  Notification on Label Error  ...............................   9
   5.    Explicit Label Control  ..................................   9
    5.1  Procedures  ..............................................   9

Ashwood-Smith & Berger      Standards Track                     [Page 1]
RFC 3472          GMPLS Signaling - CR-LDP Extensions       January 2003

   6.  Protection TLV  ............................................  10
    6.1  Procedures  ..............................................  11
   7.  Administrative Status Information  .........................  11
    7.1  Admin Status TLV  ........................................  11
    7.2  REQUEST and MAPPING Message Procedures  ..................  12
    7.3  Notification Message Procedures  .........................  13
   8.  Control Channel Separation  ................................  14
    8.1  Interface Identification  ................................  14
    8.2  Errored Interface Identification  ........................  15
   9.  Fault Handling     .........................................  17
   10  Acknowledgments  ...........................................  17
   11. Security Considerations  ...................................  17
   12. IANA Considerations  .......................................  17
   13. Intellectual Property Considerations  ......................  18
   14. References  ................................................  18
    14.1  Normative References  ...................................  18
    14.2  Informative References  .................................  19
   15. Contributors  ..............................................  19
   16. Editors' Addresses  ........................................  22
   17. Full Copyright Statement ...................................  23

1. Introduction

   Generalized MPLS extends MPLS from supporting packet (PSC) interfaces
   and switching to include support of three new classes of interfaces
   and switching: Time-Division Multiplex (TDM), Lambda Switch (LSC) and
   Fiber-Switch (FSC).  A functional description of the extensions to
   MPLS signaling needed to support the new classes of interfaces and
   switching is provided in [RFC3471].  This document presents CR-LDP
   specific formats and mechanisms needed to support all four classes of
   interfaces.  RSVP-TE extensions can be found in [RFC3473].

   [RFC3471] should be viewed as a companion document to this document.
   The format of this document parallels [RFC3471].  It should be noted
   that the RSVP-TE specific version of Generalized MPLS includes RSVP
   specific support for rapid failure notification, see Section 4
   [RFC3473].  For CR-LDP there is not currently a similar mechanism.