Linear Protection Switching in MPLS-TP
draft-zulr-mpls-tp-linear-protection-switching-06

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MPLS Working Group                                  H. van Helvoort, Ed.
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                            J. Ryoo, Ed.
Expires: May 9, 2013                                                ETRI
                                                                H. Zhang
                                                     Huawei Technologies
                                                                F. Huang
                                            Alcatel-Lucent Shanghai Bell
                                                                   H. Li
                                                            China Mobile
                                                         A. D'Alessandro
                                                          Telecom Italia
                                                        November 5, 2012

                 Linear Protection Switching in MPLS-TP
         draft-zulr-mpls-tp-linear-protection-switching-06.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 May 9, 2013                  [Page 1]
Internet-Draft   Linear Protection Switching in MPLS-TP    November 2012

   This Internet-Draft will expire on May 9, 2013.

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van Helvoort, et al.       Expires May 9, 2013                  [Page 2]
Internet-Draft   Linear Protection Switching in MPLS-TP    November 2012

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Linear protection switching overview . . . . . . . . . . . . .  5
     2.1.  Protection architecture types  . . . . . . . . . . . . . .  5
       2.1.1.  1+1 architecture . . . . . . . . . . . . . . . . . . .  5
       2.1.2.  1:1 architecture . . . . . . . . . . . . . . . . . . .  5
       2.1.3.  1:n architecture . . . . . . . . . . . . . . . . . . .  6
     2.2.  Protection switching type  . . . . . . . . . . . . . . . .  6
     2.3.  Protection operation type  . . . . . . . . . . . . . . . .  6
   3.  Protection switching trigger conditions  . . . . . . . . . . .  7
     3.1.  Fault conditions . . . . . . . . . . . . . . . . . . . . .  7
     3.2.  External commands  . . . . . . . . . . . . . . . . . . . .  7
       3.2.1.  End-to-end commands  . . . . . . . . . . . . . . . . .  7
       3.2.2.  Local commands . . . . . . . . . . . . . . . . . . . .  8
   4.  Protection switching schemes . . . . . . . . . . . . . . . . .  8
     4.1.  1+1 unidirectional protection switching  . . . . . . . . .  9
     4.2.  1+1 bidirectional protection switching . . . . . . . . . . 10
     4.3.  1:1 bidirectional protection switching . . . . . . . . . . 11
   5.  APS protocol . . . . . . . . . . . . . . . . . . . . . . . . . 12
     5.1.  APS PDU format . . . . . . . . . . . . . . . . . . . . . . 12
     5.2.  APS transmission . . . . . . . . . . . . . . . . . . . . . 15
     5.3.  Hold-off timer . . . . . . . . . . . . . . . . . . . . . . 15
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