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

Document Type Active Internet-Draft (mpls WG)
Last updated 2017-03-27
Replaces draft-cheng-mpls-tp-shared-ring-protection
Stream IETF
Intended RFC status Proposed Standard
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Network Working Group                                           W. Cheng
Internet-Draft                                                   L. Wang
Intended status: Standards Track                                   H. Li
Expires: September 28, 2017                                 China Mobile
                                                             H. Helvoort
                                                          Hai Gaoming BV
                                                                 J. Dong
                                                     Huawei Technologies
                                                          March 27, 2017

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

Abstract

   This document describes requirements, architecture and solutions for
   MPLS-TP Shared Ring Protection (MSRP) in a ring topology for point-
   to-point (P2P) services.  The MSRP mechanism is described to meet the
   ring protection requirements as described in RFC 5654.  This document
   defines the Ring Protection Switch (RPS) Protocol that is used to
   coordinate the protection behavior of the nodes on MPLS ring.

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
   working documents as Internet-Drafts.  The list of current Internet-
   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
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 28, 2017.

Cheng, et al.          Expires September 28, 2017               [Page 1]
Internet-Draft                    MSRP                        March 2017

Copyright Notice

   Copyright (c) 2017 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
   carefully, as they describe your rights and restrictions with respect
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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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Notation  . . . . . . . . . . . . . . . . . .   3
   3.  MPLS-TP Ring Protection Criteria and Requirements . . . . . .   4
   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 . . . . . . . . . .   7
       4.1.3.  Forwarding Operation  . . . . . . . . . . . . . . . .   7
     4.2.  Failure Detection . . . . . . . . . . . . . . . . . . . .   8
     4.3.  Ring Protection . . . . . . . . . . . . . . . . . . . . .   9
       4.3.1.  Wrapping  . . . . . . . . . . . . . . . . . . . . . .  10
       4.3.2.  Short Wrapping  . . . . . . . . . . . . . . . . . . .  12
       4.3.3.  Steering  . . . . . . . . . . . . . . . . . . . . . .  14
     4.4.  Interconnected Ring Protection  . . . . . . . . . . . . .  17
       4.4.1.  Interconnected Ring Topology  . . . . . . . . . . . .  17
       4.4.2.  Interconnected Ring Protection Mechanisms . . . . . .  19
       4.4.3.  Ring Tunnels in Interconnected Rings  . . . . . . . .  20
       4.4.4.  Interconnected Ring Switching Procedure . . . . . . .  22
       4.4.5.  Interconnected Ring Detection Mechanism . . . . . . .  22
   5.  Ring Protection Coordination Protocol . . . . . . . . . . . .  23
     5.1.  RPS Protocol  . . . . . . . . . . . . . . . . . . . . . .  23
       5.1.1.  Transmission and Acceptance of RPS Requests . . . . .  25
       5.1.2.  RPS PDU Format  . . . . . . . . . . . . . . . . . . .  26
       5.1.3.  Ring Node RPS States  . . . . . . . . . . . . . . . .  27
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