Using a Generic Associated Channel Label as a Virtual Circuit Connectivity Verification Channel Indicator
RFC 7708

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Internet Engineering Task Force (IETF)                         T. Nadeau
Request for Comments: 7708                                       Brocade
Category: Standards Track                                     L. Martini
ISSN: 2070-1721                                                S. Bryant
                                                           Cisco Systems
                                                           November 2015

                Using a Generic Associated Channel Label
    as a Virtual Circuit Connectivity Verification Channel Indicator

Abstract

   The Virtual Circuit Connectivity Verification (VCCV) protocol
   specified in RFC 5085 provides a control channel (CC) that is
   associated with a pseudowire (PW).  This document specifies an
   additional VCCV control channel type to be used with pseudowires that
   do not use the PW Control Word and that are carried over an MPLS
   network.  This new VCCV CC type uses the Generic Associated Channel
   Label defined in RFC 5586 to distinguish VCCV packets from packets
   carrying user data.  This new VCCV CC type introduces compatibility
   with the method of MPLS Label Switched Path Operations,
   Administration, and Maintenance (OAM) identification, particularly in
   MPLS Transport Profile (MPLS-TP) networks (RFC 5921).

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/rfc7708.

Nadeau, et al.               Standards Track                    [Page 1]
RFC 7708                  GAL as a VCCV Channel            November 2015

Copyright Notice

   Copyright (c) 2015 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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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Type 4 MPLS VCCV Control Channel Type . . . . . . . . . . . .   3
   4.  FAT PWs . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Multi-Segment Pseudowires . . . . . . . . . . . . . . . . . .   5
   6.  VCCV Capability Advertisement . . . . . . . . . . . . . . . .   5
   7.  Manageability Considerations  . . . . . . . . . . . . . . . .   6
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
     9.1.  MPLS VCCV Control Channel (CC) Type 4 . . . . . . . . . .   7
     9.2.  LDP Status Code . . . . . . . . . . . . . . . . . . . . .   7
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     10.2.  Informative References . . . . . . . . . . . . . . . . .   8
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The Virtual Circuit Connectivity Verification (VCCV) protocol is
   specified in RFC 5085 [RFC5085].  This document specifies a new VCCV
   control channel (VCCV CC) type to be used with pseudowires (PWs)
   carried over an MPLS network that do not use the PW Control Word (CW)
   [RFC4385].  This new VCCV CC type uses the Generic Associated Channel
   Label (GAL) [RFC5586] to distinguish VCCV packets from packets
   carrying user data.  This new VCCV CC type provides compatibility
   with the method of MPLS Label Switched Path (LSP) Operations,
   Administration, and Maintenance (OAM) message identification, as used
   in MPLS Transport Profile (MPLS-TP) networks [RFC5921].

Nadeau, et al.               Standards Track                    [Page 2]
RFC 7708                  GAL as a VCCV Channel            November 2015

   VCCV currently specifies three CC types.  VCCV CC Type 1 uses the PW
   Control Word (CW) to distinguish VCCV packets from packets carrying
   user data.  VCCV CC Types 2 and 3 require IP encapsulation for OAM