MPLS-TP protection for interconnected rings
draft-liu-mpls-tp-interconnected-ring-protection-03

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Last updated 2012-10-21
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MPLS Working Group                                                G. Liu
Internet-Draft                                           ZTE Corporation
Intended status: Informational                              Y. Weigarten
Expires: April 22, 2013
                                                              M. Daikoku
                                                             T. Maruyama
                                                        KDDI Corporation
                                                        October 19, 2012

              MPLS-TP protection for interconnected rings
          draft-liu-mpls-tp-interconnected-ring-protection-03

Abstract

   The requirements for MPLS Transport Profile include a requirement
   (R93) that requires that MPLS-TP must support recovery mechanisms for
   a network constructed from interconnected rings that protect user
   data that traverses more than one ring.  In particular, this includes
   protecting against cases of failure at the ring interconnect nodes
   and links.  This document presents different configurations of
   interconnected rings and special mechanisms to address the recovery
   of ring-interconnect nodes and links. .

   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

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   This Internet-Draft will expire on April 22, 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
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   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Conventions used in this document  . . . . . . . . . . . . . .  8
   3.  recovery mechanism . . . . . . . . . . . . . . . . . . . . . .  9
     3.1.  recovery mechanism for Dual-node interconnection . . . . .  9
     3.2.  recovery mechanism for Chained interconnection . . . . . . 11
   4.  Security Considerations  . . . . . . . . . . . . . . . . . . . 12
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   6.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 12
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 12
     7.1.  Normative References . . . . . . . . . . . . . . . . . . . 12
     7.2.  Informative References . . . . . . . . . . . . . . . . . . 12
     7.3.  URL References . . . . . . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

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1.  Introduction

   This document describes different interconnected ring scenarios and a
   few special solutions to protect against the failure of the ring-
   interconnect nodes and links. there are three common interconnection
   scenarios that we will address in this document:

   Dual-node interconnection - when the two rings are interconnected by
   two nodes from each ring (see Figure 1);
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