Updates to MPLS Transport Profile (MPLS-TP) Linear Protection in Automatic Protection Switching (APS) Mode
RFC 8234

Document Type RFC - Proposed Standard (August 2017; No errata)
Updates RFC 7271
Last updated 2017-08-23
Replaces draft-ryoo-mpls-tp-aps-updates
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
Shepherd write-up Show (last changed 2017-01-08)
IESG IESG state RFC 8234 (Proposed Standard)
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Send notices to "Loa Andersson" <loa@pi.nu>
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                           J. Ryoo
Request for Comments: 8234                                     T. Cheung
Updates: 7271                                                       ETRI
Category: Standards Track                                H. van Helvoort
ISSN: 2070-1721                                           Hai Gaoming BV
                                                                 I. Busi
                                                                  G. Wen
                                                     Huawei Technologies
                                                             August 2017

    Updates to MPLS Transport Profile (MPLS-TP) Linear Protection in
               Automatic Protection Switching (APS) Mode

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 the operation related to state transition table lookup.

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/rfc8234.

Ryoo, et al.                 Standards Track                    [Page 1]
RFC 8234            Updates to MPLS-TP LP in APS Mode        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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions Used in This Document . . . . . . . . . . . . . .   4
   3.  Abbreviations . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Updates . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Initialization Behavior . . . . . . . . . . . . . . . . .   5
     4.2.  State Transition Modification . . . . . . . . . . . . . .   6
     4.3.  Operation Related to State Transition Table Lookup  . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

Ryoo, et al.                 Standards Track                    [Page 2]
RFC 8234            Updates to MPLS-TP LP in APS Mode        August 2017

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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