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Using the Generic Associated Channel Label for Pseudowire in the MPLS Transport Profile (MPLS-TP)
RFC 6423

Internet Engineering Task Force (IETF)                             H. Li
Request for Comments: 6423                                  China Mobile
Updates: 5586                                                 L. Martini
Category: Standards Track                                   Cisco System
ISSN: 2070-1721                                                    J. He
                                                                  Huawei
                                                                F. Huang
                                                          Alcatel-Lucent
                                                           November 2011

      Using the Generic Associated Channel Label for Pseudowire in
                  the MPLS Transport Profile (MPLS-TP)

Abstract

   This document describes the requirements for using the Generic
   Associated Channel Label (GAL) in pseudowires (PWs) in MPLS Transport
   Profile (MPLS-TP) networks, and provides an update to the description
   of GAL usage in RFC 5586 by removing the restriction that is imposed
   on using GAL for PWs, especially in MPLS-TP environments.

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/rfc6423.

Li, et al.                   Standards Track                    [Page 1]
RFC 6423                 Using GAL in MPLS-TP PW           November 2011

Copyright Notice

   Copyright (c) 2011 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.

Table of Contents

   1. Introduction ....................................................2
   2. Conventions Used in This Document ...............................2
      2.1. Terminology ................................................3
   3. GAL Usage for MPLS-TP PW ........................................3
   4. Security Considerations .........................................4
   5. Acknowledgments .................................................4
   6. References ......................................................5
      6.1. Normative References .......................................5
      6.2. Informative References .....................................5

1.  Introduction

   [RFC5586] generalizes the Associated Channel mechanism of [RFC5085]
   to be used for Sections, Label Switched Paths (LSPs), and Pseudowires
   (PWs) in MPLS networks.  [RFC5085] defines the Associated Channel
   Header (ACH), and [RFC5586] generalizes this for use as the Generic
   Associated Channel (G-ACh).

   [RFC5586] defines a generalized label-based exception mechanism using
   the Generic Associated Channel Label (GAL) to work together with the
   ACH for use with LSPs but prohibits GAL usage with PWs.

   This document removes the restriction imposed by [RFC5586].

2.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

Li, et al.                   Standards Track                    [Page 2]
RFC 6423                 Using GAL in MPLS-TP PW           November 2011

2.1.  Terminology

   ACH      Associated Channel Header

   CW       Control Word

   G-ACh    Generic Associated Channel

   GAL      Generic Associated Channel Label

   MPLS-TP  MPLS Transport Profile

   OAM      Operation, Administration, and Maintenance

3.  GAL Usage for MPLS-TP PW

   According to the MPLS-TP requirements document [RFC5654], it is

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