MPLS Transport Profile (MPLS-TP) Linear Protection
RFC 6378

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Internet Engineering Task Force (IETF)                Y. Weingarten, Ed.
Request for Comments: 6378                        Nokia Siemens Networks
Category: Standards Track                                      S. Bryant
ISSN: 2070-1721                                               E. Osborne
                                                                   Cisco
                                                             N. Sprecher
                                                  Nokia Siemens Networks
                                                       A. Fulignoli, Ed.
                                                                Ericsson
                                                            October 2011

           MPLS Transport Profile (MPLS-TP) Linear Protection

Abstract

   This document is a product of a joint Internet Engineering Task Force
   (IETF) / International Telecommunications Union Telecommunications
   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.

   This document addresses the functionality described in the MPLS-TP
   Survivability Framework document (RFC 6372) and defines a protocol
   that may be used to fulfill the function of the Protection State
   Coordination for linear protection, as described in that document.

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/rfc6378.

Weingarten, et al.           Standards Track                    [Page 1]
RFC 6378                       MPLS-TP LP                   October 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
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   include Simplified BSD License text as described in Section 4.e of
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   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.

Weingarten, et al.           Standards Track                    [Page 2]
RFC 6378                       MPLS-TP LP                   October 2011

Table of Contents

   1. Introduction ....................................................4
      1.1. Protection Architectures ...................................4
      1.2. Scope of the Document ......................................5
   2. Conventions Used in This Document ...............................6
      2.1. Acronyms ...................................................6
      2.2. Definitions and Terminology ................................7
   3. Protection State Control Logic ..................................7
      3.1. Local Request Logic ........................................9
      3.2. Remote Requests ...........................................11
      3.3. PSC Control Logic .........................................12
      3.4. PSC Message Generator .....................................12
      3.5. Wait-to-Restore (WTR) Timer ...............................12
      3.6. PSC Control States ........................................13
           3.6.1. Local and Remote State .............................14
   4. Protection State Coordination (PSC) Protocol ...................14
      4.1. Transmission and Acceptance of PSC Control Packets ........15