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MPLS-TP Ring Protection Switching (MRPS)
draft-helvoort-mpls-tp-ring-protection-switching-05

Document type: Active Internet-Draft (individual)
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Last updated: 2013-10-15
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MPLS Working Group                                  H. van Helvoort, Ed.
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                            J. Ryoo, Ed.
Expires: April 18, 2014                                             ETRI

                                                        October 15, 2013

                MPLS-TP Ring Protection Switching (MRPS)
        draft-helvoort-mpls-tp-ring-protection-switching-05.txt

Abstract

   This document describes a mechanism to address the requirements for
   protection of the Multi-Protocol Label Switching Transport Profile
   (MPLS-TP) Label Switched Paths (LSP) in a ring topology.  The
   mechanism defined herein is designed to support point-to-point as
   well as point-to-multipoint LSPs.

   The MPLS-TP section layer OAM is used to monitor the connectivity
   between each two adjacent nodes using the mechanisms defined in the
   [RFC6371].

   The Automatic Protection Switching (APS) protocol is used for
   coordination of protection switching actions between the ring nodes.

Status of This Memo

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

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van Helvoort & Ryoo      Expires April 18, 2014                 [Page 1]
Internet-Draft      MPLS-TP Ring Protection Switching       October 2013

   This Internet-Draft will expire on April 18, 2014.

Copyright Notice

   Copyright (c) 2013 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Contributing authors  . . . . . . . . . . . . . . . . . .   4
   2.  Conventions Used in this Document . . . . . . . . . . . . . .   4
     2.1.  Abbreviations . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Ring protection schemes . . . . . . . . . . . . . . . . . . .   4
     3.1.  Wrapping  . . . . . . . . . . . . . . . . . . . . . . . .   4
       3.1.1.  Wrapping protection scheme applicability  . . . . . .   5
       3.1.2.  P-t-p LSP example . . . . . . . . . . . . . . . . . .   5
       3.1.3.  P-t-mp LSP example  . . . . . . . . . . . . . . . . .   7
     3.2.  Steering  . . . . . . . . . . . . . . . . . . . . . . . .  10
       3.2.1.  Steering protection scheme applicability  . . . . . .  10
       3.2.2.  P-t-p LSP example . . . . . . . . . . . . . . . . . .  10
       3.2.3.  P-t-mp LSP example  . . . . . . . . . . . . . . . . .  12
   4.  MRPS characteristics  . . . . . . . . . . . . . . . . . . . .  15
     4.1.  Switching types . . . . . . . . . . . . . . . . . . . . .  15
     4.2.  Operation types . . . . . . . . . . . . . . . . . . . . .  15
     4.3.  Traffic types . . . . . . . . . . . . . . . . . . . . . .  15
       4.3.1.  Bandwidth sharing . . . . . . . . . . . . . . . . . .  15
       4.3.2.  Bandwidth and QoS considerations  . . . . . . . . . .  15
       4.3.3.  Point-to-point and point-to-multipoint traffic  . . .  16
   5.  APS protocol  . . . . . . . . . . . . . . . . . . . . . . . .  16
     5.1.  Transmission and acceptance of APS requests . . . . . . .  18
     5.2.  APS PDU structure . . . . . . . . . . . . . . . . . . . .  18
     5.3.  Ring node APS states  . . . . . . . . . . . . . . . . . .  19
       5.3.1.  Idle state  . . . . . . . . . . . . . . . . . . . . .  19
       5.3.2.  Switching state . . . . . . . . . . . . . . . . . . .  20
       5.3.3.  Pass-through state  . . . . . . . . . . . . . . . . .  20
       5.3.4.  APS state transitions . . . . . . . . . . . . . . . .  21
   6.  Protection switching triggers . . . . . . . . . . . . . . . .  23

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