MPLS-TP protection for interconnected rings
draft-liu-mpls-tp-interconnected-ring-protection-04

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

              MPLS-TP protection for interconnected rings
          draft-liu-mpls-tp-interconnected-ring-protection-04

Abstract

   The requirements for MPLS Transport Profile include a requirement
   (R93) that requires 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 scenario of
   interconnected rings and special mechanism to address recovery of the
   failure 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 October 21, 2013.

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Copyright Notice

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   6
   3.  Recovery mechanism  . . . . . . . . . . . . . . . . . . . . .   7
     3.1.  Recovery mechanism for Dual-node interconnection  . . . .   7
     3.2.  Recovery mechanism for chained interconnection  . . . . .   9
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  11
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  11
     7.3.  URL References  . . . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   This document describes different interconnected ring scenario and a
   few special mechanisms 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);

   Single-node interconnection - when the connection between the two
   rings is through a single node (see Figure 2).As the interconnnection
   node(LSR-A) is a single-point of failure, this scenario should be
   avoided in real networks;

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