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Requirements of an MPLS Transport Profile
RFC 5654

Network Working Group                              B. Niven-Jenkins, Ed.
Request for Comments: 5654                                            BT
Category: Standards Track                               D. Brungard, Ed.
                                                                    AT&T
                                                           M. Betts, Ed.
                                                     Huawei Technologies
                                                             N. Sprecher
                                                  Nokia Siemens Networks
                                                                 S. Ueno
                                                      NTT Communications
                                                          September 2009

               Requirements of an MPLS Transport Profile

Abstract

   This document specifies the requirements of an MPLS Transport Profile
   (MPLS-TP).  This document is a product of a joint effort of the
   International Telecommunications Union (ITU) and IETF to include an
   MPLS Transport Profile within the IETF MPLS and PWE3 architectures to
   support the capabilities and functionalities of a packet transport
   network as defined by International Telecommunications Union -
   Telecommunications Standardization Sector (ITU-T).

   This work is based on two sources of requirements: MPLS and PWE3
   architectures as defined by IETF, and packet transport networks as
   defined by ITU-T.

   The requirements expressed in this document are for the behavior of
   the protocol mechanisms and procedures that constitute building
   blocks out of which the MPLS Transport Profile is constructed.  The
   requirements are not implementation requirements.

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 and License Notice

   Copyright (c) 2009 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Niven-Jenkins, et al.       Standards Track                     [Page 1]
RFC 5654                  MPLS-TP Requirements            September 2009

   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 BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Requirements Language  . . . . . . . . . . . . . . . . . .  5
     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  5
       1.2.1.  Abbreviations  . . . . . . . . . . . . . . . . . . . .  6
       1.2.2.  Definitions  . . . . . . . . . . . . . . . . . . . . .  7
     1.3.  Transport Network Overview . . . . . . . . . . . . . . . . 10
     1.4.  Layer Network Overview . . . . . . . . . . . . . . . . . . 11
   2.  MPLS-TP Requirements . . . . . . . . . . . . . . . . . . . . . 12
     2.1.  General Requirements . . . . . . . . . . . . . . . . . . . 13
     2.2.  Layering Requirements  . . . . . . . . . . . . . . . . . . 16
     2.3.  Data Plane Requirements  . . . . . . . . . . . . . . . . . 17
     2.4.  Control Plane Requirements . . . . . . . . . . . . . . . . 18
     2.5.  Recovery Requirements  . . . . . . . . . . . . . . . . . . 19
       2.5.1.  Data-Plane Behavior Requirements . . . . . . . . . . . 20
         2.5.1.1.  Protection . . . . . . . . . . . . . . . . . . . . 20
         2.5.1.2.  Sharing of Protection Resources  . . . . . . . . . 21
       2.5.2.  Restoration  . . . . . . . . . . . . . . . . . . . . . 21
       2.5.3.  Triggers for Protection, Restoration, and Reversion  . 22
       2.5.4.  Management-Plane Operation of Protection and
               Restoration  . . . . . . . . . . . . . . . . . . . . . 22
       2.5.5.  Control Plane and In-Band OAM Operation of Recovery  . 23
       2.5.6.  Topology-Specific Recovery Mechanisms  . . . . . . . . 24
         2.5.6.1.  Ring Protection  . . . . . . . . . . . . . . . . . 24
     2.6.  QoS Requirements . . . . . . . . . . . . . . . . . . . . . 27
   3.  Requirements Discussed in Other Documents  . . . . . . . . . . 27
     3.1.  Network Management Requirements  . . . . . . . . . . . . . 27

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