Virtual Circuit Connectivity Verification (VCCV) Capability Advertisement for MPLS Transport Profile (MPLS-TP)
RFC 7189

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Internet Engineering Task Force (IETF)                         G. Mirsky
Request for Comments: 7189                                      Ericsson
Category: Standards Track                                     March 2014
ISSN: 2070-1721

            Virtual Circuit Connectivity Verification (VCCV)
     Capability Advertisement for MPLS Transport Profile (MPLS-TP)

Abstract

   This document specifies how signaling and selection processes for
   Pseudowire (PW) Virtual Circuit Connectivity Verification (VCCV) are
   modified to ensure backward compatibility and allow use of proactive
   Connectivity Verification (CV), Continuity Check (CC), and Remote
   Defect Indication (RDI) over MPLS Transport Profile (MPLS-TP) PWs.
   This document introduces four new CV types and, to accommodate them,
   a new VCCV Extended CV parameter for PW Interface Parameters Sub-TLV
   is defined.

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 5741.

   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/rfc7189.

Copyright Notice

   Copyright (c) 2014 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
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   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.

Mirsky                       Standards Track                    [Page 1]
RFC 7189                    VCCV for MPLS-TP                  March 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions Used in This Document . . . . . . . . . . . .   2
       1.1.1.  Terminology . . . . . . . . . . . . . . . . . . . . .   2
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   3
   2.  MPLS-TP CC-CV on Pseudowires  . . . . . . . . . . . . . . . .   3
     2.1.  VCCV Extended CV Advertisement Sub-TLV  . . . . . . . . .   3
     2.2.  MPLS-TP CC-CV Types . . . . . . . . . . . . . . . . . . .   3
     2.3.  MPLS-TP CC-CV Type Operation  . . . . . . . . . . . . . .   4
     2.4.  CV Type Selection . . . . . . . . . . . . . . . . . . . .   4
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  VCCV Extended CV Types  . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   7

1.  Introduction

   Proactive Connectivity Verification (CV), Continuity Check (CC), and
   Remote Defect Indication (RDI) for the MPLS Transport Profile
   [RFC6428] are applicable to all constructs of the MPLS-TP, including
   pseudowires (PWs).  If the control plane is used to operate and
   manage PWs then the procedures defined in [RFC5085] and [RFC5885]
   should be used to select the proper type of Control Channel and the
   corresponding type of Connectivity Verification.  This document
   specifies how signaling and selection processes are modified to
   ensure backward compatibility and allow use of proactive CV-CC-RDI
   over MPLS-TP PWs.

1.1.  Conventions Used in This Document

1.1.1.  Terminology

   BFD: Bidirectional Forwarding Detection

   CC: Continuity Check

   CV: Connectivity Verification

   PE: Provider Edge

   VCCV: Virtual Circuit Connectivity Verification

Mirsky                       Standards Track                    [Page 2]
RFC 7189                    VCCV for MPLS-TP                  March 2014

1.1.2.  Requirements Language

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

2.  MPLS-TP CC-CV on Pseudowires

   PW VCCV can support several CV Types, and it can support an arbitrary
   combination of CV modes advertised in the CV Types field of the VCCV