Updates to MPLS Transport Profile (MPLS-TP) Linear Protection in Automatic Protection Switching (APS) Mode
draft-ietf-mpls-tp-aps-updates-03

Document Type Active Internet-Draft (mpls WG)
Last updated 2017-05-21 (latest revision 2017-02-21)
Replaces draft-ryoo-mpls-tp-aps-updates
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Send notices to "Loa Andersson" <loa@pi.nu>
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MPLS Working Group                                               J. Ryoo
Internet-Draft                                                 T. Cheung
Updates: 7271 (if approved)                                         ETRI
Intended status: Standards Track                         H. van Helvoort
Expires: August 25, 2017                                  Hai Gaoming BV
                                                                 I. Busi
                                                                  G. Wen
                                                     Huawei Technologies
                                                       February 21, 2017

    Updates to MPLS Transport Profile (MPLS-TP) Linear Protection in
               Automatic Protection Switching (APS) Mode
                 draft-ietf-mpls-tp-aps-updates-03.txt

Abstract

   This document contains updates to MPLS Transport Profile (MPLS-TP)
   linear protection in Automatic Protection Switching (APS) mode
   defined in RFC 7271.  The updates provide rules related to the
   initialization of the Protection State Coordination (PSC) Control
   Logic, in which the state machine resides, when operating in APS
   mode, and clarify some operation related to state transition table
   lookup.

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
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   This Internet-Draft will expire on August 25, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Ryoo, et al.             Expires August 25, 2017                [Page 1]
Internet-Draft      Updates to MPLS-TP LP in APS mode      February 2017

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   3.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Updates . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Initialization Behavior . . . . . . . . . . . . . . . . .   4
     4.2.  State Transition Modification . . . . . . . . . . . . . .   5
     4.3.  Operation related to State Transition Table Lookup  . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   MPLS Transport Profile (MPLS-TP) linear protection in Automatic
   Protection Switching (APS) mode is defined in RFC 7271 [RFC7271].  It
   defines a set of alternate and additional mechanisms to perform some
   of the functions of linear protection described in RFC 6378
   [RFC6378].  The actions performed at initialization of the Protection
   State Coordination (PSC) Control Logic are not described in either
   [RFC7271] or [RFC6378].  Although it is a common perception that the
   state machine starts at the Normal state, this is not explicitly
   specified in any of the documents and various questions have been
   raised by implementers and in discussions on the MPLS working group
   mailing list concerning the detailed actions that the PSC Control
   Logic should take.

   The state machine described in [RFC7271] operates under the
   assumption that both end nodes of a linear protection domain start in
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