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Generalized MPLS (GMPLS) Protocol Extensions for Multi-Layer and Multi-Region Networks (MLN/MRN)
RFC 6001

Internet Engineering Task Force (IETF)                  D. Papadimitriou
Request for Comments: 6001                                  M. Vigoureux
Updates: 4202, 4203, 4206, 4874, 4974, 5307               Alcatel-Lucent
Category: Standards Track                                    K. Shiomoto
ISSN: 2070-1721                                                      NTT
                                                             D. Brungard
                                                                     ATT
                                                             JL. Le Roux
                                                          France Telecom
                                                            October 2010

              Generalized MPLS (GMPLS) Protocol Extensions
          for Multi-Layer and Multi-Region Networks (MLN/MRN)

Abstract

   There are specific requirements for the support of networks
   comprising Label Switching Routers (LSRs) participating in different
   data plane switching layers controlled by a single Generalized Multi-
   Protocol Label Switching (GMPLS) control plane instance, referred to
   as GMPLS Multi-Layer Networks / Multi-Region Networks (MLN/MRN).

   This document defines extensions to GMPLS routing and signaling
   protocols so as to support the operation of GMPLS Multi-Layer /
   Multi-Region Networks.  It covers the elements of a single GMPLS
   control plane instance controlling multiple Label Switched Path (LSP)
   regions or layers within a single Traffic Engineering (TE) domain.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6001.

Papadimitriou, et al.        Standards Track                    [Page 1]
RFC 6001          GMPLS Protocol Extensions for MLN/MRN     October 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Papadimitriou, et al.        Standards Track                    [Page 2]
RFC 6001          GMPLS Protocol Extensions for MLN/MRN     October 2010

Table of Contents

   1. Introduction ....................................................3
      1.1. Conventions Used in This Document ..........................4
   2. Summary of the Requirements and Evaluation ......................4
   3. Interface Adjustment Capability Descriptor (IACD) ...............5
      3.1. Overview ...................................................5
      3.2. Interface Adjustment Capability Descriptor (IACD) ..........6
   4. Multi-Region Signaling ..........................................9
      4.1. XRO Subobjects ............................................10
   5. Virtual TE Link ................................................12
      5.1. Edge-to-Edge Association ..................................13
      5.2. Soft Forwarding Adjacency (Soft FA) .......................16
   6. Backward Compatibility .........................................18
   7. Security Considerations ........................................18

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