MPLS-TP Shared-Ring protection (MSRP) mechanism for ring topology
draft-cheng-mpls-tp-shared-ring-protection-05

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Document Type Active Internet-Draft (mpls WG)
Last updated 2015-06-17
Replaced by draft-ietf-mpls-tp-shared-ring-protection, rfc8227
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Network Working Group                                           W. Cheng
Internet-Draft                                                   L. Wang
Intended status: Standards Track                                   H. Li
Expires: December 19, 2015                                  China Mobile
                                                             H. Helvoort
                                                          Hai Gaoming BV
                                                                  K. Liu
                                                                 J. Dong
                                                                   J. He
                                                     Huawei Technologies
                                                                   F. Li
               China Academy of Telecommunication Research, MIIT., China
                                                                 J. Yang
                                               ZTE Corporation P.R.China
                                                                 J. Wang
                      Fiberhome Telecommunication Technologies Co., LTD.
                                                           June 17, 2015

   MPLS-TP Shared-Ring protection (MSRP) mechanism for ring topology
             draft-cheng-mpls-tp-shared-ring-protection-05

Abstract

   This document describes requirements, architecture and solutions for
   MPLS-TP Shared Ring Protection (MSRP) in the ring topology for point-
   to-point (P2P) services.  The mechanism of MSRP is illustrated and
   how it satisfies the requirements in RFC 5654 for optimized ring
   protection is analyzed.

Requirements Language

   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 RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

Cheng, et al.           Expires December 19, 2015               [Page 1]
Internet-Draft                    MSRP                         June 2015

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 19, 2015.

Copyright Notice

   Copyright (c) 2015 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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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements for MPLS-TP Ring Protection  . . . . . . . . . .   4
     2.1.  Recovery of Multiple Failures . . . . . . . . . . . . . .   4
     2.2.  Smooth Upgrade from Linear Protection to Ring Protection    4
     2.3.  Configuration Complexity  . . . . . . . . . . . . . . . .   5
   3.  Terminology and Notation  . . . . . . . . . . . . . . . . . .   5
   4.  Shared Ring Protection Architecture . . . . . . . . . . . . .   5
     4.1.  Ring Tunnel . . . . . . . . . . . . . . . . . . . . . . .   5
       4.1.1.  Establishment of Ring Tunnel  . . . . . . . . . . . .   6
       4.1.2.  Label Assignment and Distribution . . . . . . . . . .   8
       4.1.3.  Forwarding Operation  . . . . . . . . . . . . . . . .   8
     4.2.  Failure Detection . . . . . . . . . . . . . . . . . . . .   9
     4.3.  Ring Protection . . . . . . . . . . . . . . . . . . . . .  10
       4.3.1.  Wrapping  . . . . . . . . . . . . . . . . . . . . . .  10
       4.3.2.  Short Wrapping  . . . . . . . . . . . . . . . . . . .  12
       4.3.3.  Steering  . . . . . . . . . . . . . . . . . . . . . .  13
     4.4.  Interconnected Ring Protection  . . . . . . . . . . . . .  16
       4.4.1.  Interconnected Ring Topology  . . . . . . . . . . . .  16
       4.4.2.  Interconnected Ring Protection Mechanisms . . . . . .  17
       4.4.3.  Ring Tunnels in Interconnected Rings  . . . . . . . .  18
       4.4.4.  Interconnected Ring Switching Procedure . . . . . . .  20
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