Updates to MPLS Transport Profile Linear Protection
draft-ietf-mpls-psc-updates-05

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Network Working Group                                         E. Osborne
Internet-Draft
Updates: 6378 (if approved)                               April 22, 2014
Intended status: Standards Track
Expires: October 24, 2014

          Updates to MPLS Transport Profile Linear Protection
                     draft-ietf-mpls-psc-updates-05

Abstract

   This document contains a number of updates to the Protection State
   Coordination (PSC) logic defined in RFC6378, "MPLS Transport Profile
   (MPLS-TP) Linear Protection".  These updates provide some rules and
   recommendations around the use of TLVs in PSC, address some issues
   raised in an ITU-T liaison statement, and clarify PSC's behavior in a
   case not well explained in RFC6378.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on October 24, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Internet-Draft                 PSC-updates                    April 2014

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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Message Formatting and Error Handling . . . . . . . . . . . .   3
     2.1.  Format on the wire  . . . . . . . . . . . . . . . . . . .   3
     2.2.  PSC TLV Format  . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  Error handling  . . . . . . . . . . . . . . . . . . . . .   3
       2.3.1.  Malformed messages  . . . . . . . . . . . . . . . . .   4
       2.3.2.  Well-formed but unexpected TLV  . . . . . . . . . . .   4
   3.  Incorrect local status after failure  . . . . . . . . . . . .   4
   4.  Handling a capabilities mismatch  . . . . . . . . . . . . . .   5
     4.1.  Protection Type mismatch  . . . . . . . . . . . . . . . .   5
     4.2.  R mismatch  . . . . . . . . . . . . . . . . . . . . . . .   6
     4.3.  Unsupported modes . . . . . . . . . . . . . . . . . . . .   6
   5.  Reversion deadlock due to a race condition  . . . . . . . . .   6
   6.  Clarifying PSC's behavior in the face of multiple inputs  . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   9
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     10.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   This document contains a number of updates to PSC [RFC6378].  One
   provides some rules and recommendations around the use of TLVs in
   PSC.  Three of them address issues #2, #7 and #8 as identified in the
   ITU's liaison statement "Recommendation ITU-T G.8131/Y.1382 revision
   - Linear protection switching for MPLS-TP networks" [LIAISON].
   Another clears up a behavior which was not well explained in RFC6378.
   These updates are not changes to the protocol's packet format or to
   PSC's design, but are corrections and clarifications to specific
   aspects of the protocol's procedures.

   This document assumes familiarity with RFC6378 and its terms,
   conventions and acronyms.  Any term used in this document but not

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