Linear Protection Switching in MPLS-TP
draft-zulr-mpls-tp-linear-protection-switching-07

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MPLS Working Group                                  H. van Helvoort, Ed.
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                            J. Ryoo, Ed.
Expires: November 07, 2013                                          ETRI
                                                                H. Zhang
                                                     Huawei Technologies
                                                                F. Huang
                                            Alcatel-Lucent Shanghai Bell
                                                                   H. Li
                                                            China Mobile
                                                         A. D'Alessandro
                                                          Telecom Italia
                                                            May 06, 2013

                 Linear Protection Switching in MPLS-TP
         draft-zulr-mpls-tp-linear-protection-switching-07.txt

Abstract

   This document specifies a linear protection switching mechanism for
   MPLS-TP.  This mechanism supports 1+1 unidirectional/bidirectional
   protection switching and 1:1 bidirectional protection switching.  It
   is purely supported by MPLS-TP data plane, and can work without any
   control plane.

   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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   provisions of BCP 78 and BCP 79.

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van Helvoort, et al.   Expires November 07, 2013                [Page 1]
Internet-Draft   Linear Protection Switching in MPLS-TP         May 2013

   This Internet-Draft will expire on November 07, 2013.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Linear protection switching overview  . . . . . . . . . . . .   4
     2.1.  Protection architecture types . . . . . . . . . . . . . .   4
       2.1.1.  1+1 architecture  . . . . . . . . . . . . . . . . . .   4
       2.1.2.  1:1 architecture  . . . . . . . . . . . . . . . . . .   4
       2.1.3.  1:n architecture  . . . . . . . . . . . . . . . . . .   4
     2.2.  Protection switching type . . . . . . . . . . . . . . . .   5
     2.3.  Protection operation type . . . . . . . . . . . . . . . .   5
   3.  Protection switching trigger conditions . . . . . . . . . . .   5
     3.1.  Fault conditions  . . . . . . . . . . . . . . . . . . . .   6
     3.2.  External commands . . . . . . . . . . . . . . . . . . . .   6
       3.2.1.  End-to-end commands . . . . . . . . . . . . . . . . .   6
       3.2.2.  Local commands  . . . . . . . . . . . . . . . . . . .   7
   4.  Protection switching schemes  . . . . . . . . . . . . . . . .   7
     4.1.  1+1 unidirectional protection switching . . . . . . . . .   7
     4.2.  1+1 bidirectional protection switching  . . . . . . . . .   8
     4.3.  1:1 bidirectional protection switching  . . . . . . . . .   9
   5.  APS protocol  . . . . . . . . . . . . . . . . . . . . . . . .  10
     5.1.  APS PDU format  . . . . . . . . . . . . . . . . . . . . .  10
     5.2.  APS transmission  . . . . . . . . . . . . . . . . . . . .  13
     5.3.  Hold-off timer  . . . . . . . . . . . . . . . . . . . . .  13
   6.  Protection switching logic  . . . . . . . . . . . . . . . . .  14
   7.  Protection switching state transition table . . . . . . . . .  16