Applicability of MPLS-TP Linear Protection for Ring Topologies
draft-ietf-mpls-tp-ring-protection-03

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Document Type Active Internet-Draft (mpls WG)
Last updated 2012-11-05
Replaces draft-weingarten-mpls-tp-ring-protection
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Network Working Group                                      Y. Weingarten
Internet-Draft
Intended status: Informational                                 S. Bryant
Expires: May 9, 2013                                               Cisco
                                                           D. Ceccarelli
                                                             D. Caviglia
                                                             F. Fondelli
                                                                Ericsson
                                                                M. Corsi
                                                                  Altran
                                                                   B. Wu
                                                                  X. Dai
                                                         ZTE Corporation
                                                        November 5, 2012

     Applicability of MPLS-TP Linear Protection for Ring Topologies
               draft-ietf-mpls-tp-ring-protection-03.txt

Abstract

   This document presents an applicability of linear protection
   mechanisms for Multi-Protocol Label Switching Transport Profile
   (MPLS-TP) in ring topologies.  Protection on rings offers a number of
   opportunities for optimization as the protection choices are starkly
   limited (all traffic traveling one way around a ring can only be
   switched to travel the other way on the ring), but also suffers from
   some complications caused by the limitations of the topology.

   Requirements for MPLS-TP protection and specifically for protection
   in ring topologies are discussed in "Requirements of an MPLS
   Transport Profile" (RFC 5654) and "MPLS Transport Profile (MPLS-TP)
   Survivability Framework" (RFC 6372).  This document shows how MPLS-TP
   linear protection as defined in RFC 6378 can be applied to ring
   topologies, discusses how most of the requirements are met, and
   describes scenarios in which the function provided by applying linear
   protection in a ring topology falls short of some of the
   requirements.

   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 PWE3 architectures to support the
   capabilities and functionalities of a packet transport network as
   defined by the ITU-T.

Status of this Memo

Weingarten, et al.         Expires May 9, 2013                  [Page 1]
Internet-Draft                 MPLS-TP RP                  November 2012

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 9, 2013.

Copyright Notice

   Copyright (c) 2012 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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   described in the Simplified BSD License.

Weingarten, et al.         Expires May 9, 2013                  [Page 2]
Internet-Draft                 MPLS-TP RP                  November 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1.  Problem statement  . . . . . . . . . . . . . . . . . . . .  4
     1.2.  Scope of the document  . . . . . . . . . . . . . . . . . .  5
     1.3.  Terminology and Notation . . . . . . . . . . . . . . . . .  5
     1.4.  Contributing Authors . . . . . . . . . . . . . . . . . . .  7
   2.  P2P Ring Protection  . . . . . . . . . . . . . . . . . . . . .  7
     2.1.  Wrapping . . . . . . . . . . . . . . . . . . . . . . . . .  7
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