A Framework for MPLS in Transport Networks
RFC 5921

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Internet Engineering Task Force (IETF)                     M. Bocci, Ed.
Request for Comments: 5921                                Alcatel-Lucent
Category: Informational                                   S. Bryant, Ed.
ISSN: 2070-1721                                            D. Frost, Ed.
                                                           Cisco Systems
                                                               L. Levrau
                                                          Alcatel-Lucent
                                                               L. Berger
                                                                    LabN
                                                               July 2010

               A Framework for MPLS in Transport Networks

Abstract

   This document specifies an architectural framework for the
   application of Multiprotocol Label Switching (MPLS) to the
   construction of packet-switched transport networks.  It describes a
   common set of protocol functions -- the MPLS Transport Profile (MPLS-
   TP) -- that supports the operational models and capabilities typical
   of such networks, including signaled or explicitly provisioned
   bidirectional connection-oriented paths, protection and restoration
   mechanisms, comprehensive Operations, Administration, and Maintenance
   (OAM) functions, and network operation in the absence of a dynamic
   control plane or IP forwarding support.  Some of these functions are
   defined in existing MPLS specifications, while others require
   extensions to existing specifications to meet the requirements of the
   MPLS-TP.

   This document defines the subset of the MPLS-TP applicable in general
   and to point-to-point transport paths.  The remaining subset,
   applicable specifically to point-to-multipoint transport paths, is
   outside the scope of this document.

   This document is a product of a joint Internet Engineering Task Force
   (IETF) / International Telecommunication Union Telecommunication
   Standardization Sector (ITU-T) effort to include an MPLS Transport
   Profile within the IETF MPLS and Pseudowire Emulation Edge-to-Edge
   (PWE3) architectures to support the capabilities and functionalities
   of a packet transport network as defined by the ITU-T.

Bocci, et al.                 Informational                     [Page 1]
RFC 5921            MPLS Transport Profile Framework           July 2010

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc5921.

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.

Bocci, et al.                 Informational                     [Page 2]
RFC 5921            MPLS Transport Profile Framework           July 2010

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Motivation and Background  . . . . . . . . . . . . . . . .  4
     1.2.  Scope  . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     1.3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5
       1.3.1.  Transport Network  . . . . . . . . . . . . . . . . . .  7
       1.3.2.  MPLS Transport Profile . . . . . . . . . . . . . . . .  7
       1.3.3.  MPLS-TP Section  . . . . . . . . . . . . . . . . . . .  7
       1.3.4.  MPLS-TP Label Switched Path  . . . . . . . . . . . . .  7
       1.3.5.  MPLS-TP Label Switching Router . . . . . . . . . . . .  8
       1.3.6.  Customer Edge (CE) . . . . . . . . . . . . . . . . . . 10
       1.3.7.  Transport LSP  . . . . . . . . . . . . . . . . . . . . 10
       1.3.8.  Service LSP  . . . . . . . . . . . . . . . . . . . . . 10
       1.3.9.  Layer Network  . . . . . . . . . . . . . . . . . . . . 10
       1.3.10. Network Layer  . . . . . . . . . . . . . . . . . . . . 10