MPLS-TP Shared-Ring Protection (MSRP) Mechanism for Ring Topology
RFC 8227

Document Type RFC - Proposed Standard (August 2017; No errata)
Last updated 2017-08-29
Replaces draft-cheng-mpls-tp-shared-ring-protection
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IESG IESG state RFC 8227 (Proposed Standard)
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Send notices to "Eric Gray" <Eric.Gray@Ericsson.com> loa@pi.nu
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Internet Engineering Task Force (IETF)                          W. Cheng
Request for Comments: 8227                                       L. Wang
Category: Standards Track                                          H. Li
ISSN: 2070-1721                                             China Mobile
                                                         H. van Helvoort
                                                          Hai Gaoming BV
                                                                 J. Dong
                                                     Huawei Technologies
                                                             August 2017

   MPLS-TP Shared-Ring Protection (MSRP) Mechanism for Ring Topology

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 Switching (RPS) protocol that is used to
   coordinate the protection behavior of the nodes on an MPLS ring.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8227.

Cheng, et al.                Standards Track                    [Page 1]
RFC 8227       MSRP Protection Mechanism for Ring Topology   August 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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Cheng, et al.                Standards Track                    [Page 2]
RFC 8227       MSRP Protection Mechanism for Ring Topology   August 2017

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Terminology and Notation  . . . . . . . . . . . . . . . . . .   4
   3.  MPLS-TP Ring Protection Criteria and Requirements . . . . . .   5
   4.  Shared-Ring Protection Architecture . . . . . . . . . . . . .   6
     4.1.  Ring Tunnel . . . . . . . . . . . . . . . . . . . . . . .   6
       4.1.1.  Establishment of the Ring Tunnel  . . . . . . . . . .   8
       4.1.2.  Label Assignment and Distribution . . . . . . . . . .   9
       4.1.3.  Forwarding Operation  . . . . . . . . . . . . . . . .   9
     4.2.  Failure Detection . . . . . . . . . . . . . . . . . . . .  10
     4.3.  Ring Protection . . . . . . . . . . . . . . . . . . . . .  11
       4.3.1.  Wrapping  . . . . . . . . . . . . . . . . . . . . . .  12
       4.3.2.  Short-Wrapping  . . . . . . . . . . . . . . . . . . .  14
       4.3.3.  Steering  . . . . . . . . . . . . . . . . . . . . . .  17
     4.4.  Interconnected Ring Protection  . . . . . . . . . . . . .  21
       4.4.1.  Interconnected Ring Topology  . . . . . . . . . . . .  21
       4.4.2.  Interconnected Ring Protection Mechanisms . . . . . .  22
       4.4.3.  Ring Tunnels in Interconnected Rings  . . . . . . . .  23
       4.4.4.  Interconnected Ring-Switching Procedure . . . . . . .  25
       4.4.5.  Interconnected Ring Detection Mechanism . . . . . . .  26
   5.  Ring Protection Coordination Protocol . . . . . . . . . . . .  27
     5.1.  RPS and PSC Comparison on Ring Topology . . . . . . . . .  27
     5.2.  RPS Protocol  . . . . . . . . . . . . . . . . . . . . . .  28
       5.2.1.  Transmission and Acceptance of RPS Requests . . . . .  30
       5.2.2.  RPS Protocol Data Unit (PDU) Format . . . . . . . . .  31
       5.2.3.  Ring Node RPS States  . . . . . . . . . . . . . . . .  32
       5.2.4.  RPS State Transitions . . . . . . . . . . . . . . . .  34
     5.3.  RPS State Machine . . . . . . . . . . . . . . . . . . . .  36
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