Seamless Bidirectional Forwarding Detection (S-BFD) for Virtual Circuit Connectivity Verification (VCCV)
RFC 7885

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Internet Engineering Task Force (IETF)                       V. Govindan
Request for Comments: 7885                                  C. Pignataro
Updates: 5885                                                      Cisco
Category: Standards Track                                      July 2016
ISSN: 2070-1721

          Seamless Bidirectional Forwarding Detection (S-BFD)
          for Virtual Circuit Connectivity Verification (VCCV)

Abstract

   This document defines Seamless BFD (S-BFD) for VCCV by extending the
   procedures and Connectivity Verification (CV) types already defined
   for Bidirectional Forwarding Detection (BFD) for Virtual Circuit
   Connectivity Verification (VCCV).

   This document updates RFC 5885 by extending the CV Type values and
   the capability selection.

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/rfc7885.

Copyright Notice

   Copyright (c) 2016 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
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Govindan & Pignataro         Standards Track                    [Page 1]
RFC 7885                  Seamless BFD for VCCV                July 2016

Table of Contents

   1. Background ......................................................3
   2. S-BFD Connectivity Verification .................................3
      2.1. Co-existence of S-BFD and BFD Capabilities .................4
      2.2. S-BFD CV Operation .........................................4
           2.2.1. S-BFD Initiator Operation ...........................4
           2.2.2. S-BFD Reflector Operation ...........................5
                  2.2.2.1. Demultiplexing .............................5
                  2.2.2.2. Transmission of Control Packets ............5
                  2.2.2.3. Advertisement of Target
                           Discriminators Using LDP ...................5
                  2.2.2.4. Advertisement of Target
                           Discriminators Using L2TP ..................6
                  2.2.2.5. Provisioning of Target Discriminators ......6
      2.3. S-BFD Encapsulation ........................................6
   3. Capability Selection ............................................7
   4. Security Considerations .........................................7
   5. IANA Considerations .............................................8
      5.1. MPLS CV Types for the VCCV Interface Parameters Sub-TLV ....8
      5.2. L2TPv3 CV Types for the VCCV Capability AVP ................8
      5.3. PW Associated Channel Type .................................9
   6. References ......................................................9
      6.1. Normative References .......................................9
      6.2. Informative References ....................................10
   Acknowledgements ..................................................11
   Contributors ......................................................11
   Authors' Addresses ................................................11

Govindan & Pignataro         Standards Track                    [Page 2]
RFC 7885                  Seamless BFD for VCCV                July 2016

1.  Background

   Bidirectional Forwarding Detection (BFD) for Virtual Circuit
   Connectivity Verification (VCCV) [RFC5885] defines the CV Types for
   BFD using VCCV, protocol operation, and the required packet
   encapsulation formats.  This document extends those procedures and
   CV Type values to enable Seamless BFD (S-BFD) [RFC7880] operation
   for VCCV.

   The new S-BFD CV Types are Pseudowire (PW) demultiplexer agnostic and
   hence are applicable for both MPLS and Layer Two Tunneling Protocol
   version 3 (L2TPv3) PW demultiplexers.  This document concerns itself
   with the S-BFD VCCV operation over Single-Segment PWs (SS-PWs).  The
   scope of this document is as follows:

   o  This specification describes procedures for S-BFD asynchronous