Updates to PSC
draft-ietf-mpls-psc-updates-01

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Document Type Active Internet-Draft (mpls WG)
Author Eric Osborne 
Last updated 2014-01-24
Replaces draft-osborne-mpls-psc-updates
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Network Working Group                                         E. Osborne
Internet-Draft
Updates: RFC6378 (if approved)                          January 24, 2014
Intended status: Standards Track
Expires: July 28, 2014

                             Updates to PSC
                     draft-ietf-mpls-psc-updates-01

Abstract

   This document contains four updates to the Protection State
   Coordination (PSC) logic defined in RFC6378, "MPLS Transport Profile
   (MPLS-TP) Linear Protection" . Two of the updates correct existing
   behavior.  The third clarifies a behavior which was not explained in
   the RFC, and the fourth adds rules around handling capabilities
   mismatches.

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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   This Internet-Draft will expire on July 28, 2014.

Copyright Notice

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

Osborne                   Expires July 28, 2014                 [Page 1]
Internet-Draft                 PSC-updates                  January 2014

   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Incorrect local status after failure  . . . . . . . . . . . .   3
   3.  Reversion deadlock due to a race condition  . . . . . . . . .   3
   4.  Clarifying PSC's behavior in the face of multiple inputs  . .   4
   5.  Handling a capabilities mismatch  . . . . . . . . . . . . . .   6
     5.1.  Protection Type mismatch  . . . . . . . . . . . . . . . .   6
     5.2.  R mismatch  . . . . . . . . . . . . . . . . . . . . . . .   7
     5.3.  Unsupported modes . . . . . . . . . . . . . . . . . . . .   7
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   This document contains four updates to PSC [RFC6378].  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].  The fourth
   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
   defined herein can be found in RFC6378.  In particular, this document
   shares the acronyms defined in RFC6378 section 2.1.

Osborne                   Expires July 28, 2014                 [Page 2]
Internet-Draft                 PSC-updates                  January 2014

2.  Incorrect local status after failure

   Issue #2 in the liaison identifies a case where a strict reading of
   RFC6378 leaves a node reporting an inaccurate status:

   A node can end up sending incorrect status - NR(0,1) - despite the
   failure of the protection LSP (P-LSP).  This is clearly not correct,
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