Advertising Seamless Bidirectional Forwarding Detection (S-BFD) Discriminators in the Layer Two Tunneling Protocol Version 3 (L2TPv3)
RFC 7886

Document Type RFC - Proposed Standard (July 2016; No errata)
Last updated 2016-07-12
Replaces draft-gp-l2tpext-sbfd-discriminator
Stream IETF
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Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd Ignacio Goyret
Shepherd write-up Show (last changed 2015-12-09)
IESG IESG state RFC 7886 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Deborah Brungard
Send notices to "Ignacio Goyret" <ignacio.goyret@nokia.com>
IANA IANA review state IANA OK - Actions Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                       V. Govindan
Request for Comments: 7886                                  C. Pignataro
Category: Standards Track                                          Cisco
ISSN: 2070-1721                                                July 2016

    Advertising Seamless Bidirectional Forwarding Detection (S-BFD)
 Discriminators in the Layer Two Tunneling Protocol Version 3 (L2TPv3)

Abstract

   This document defines a new Attribute-Value Pair (AVP) that allows
   L2TP Control Connection Endpoints (LCCEs) to advertise one or more
   Seamless Bidirectional Forwarding Detection (S-BFD) Discriminator
   values using the Layer Two Tunneling Protocol version 3 (L2TPv3).

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/rfc7886.

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
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   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.

Govindan & Pignataro         Standards Track                    [Page 1]
RFC 7886             S-BFD Discriminators in L2TPv3            July 2016

Table of Contents

   1. Introduction ....................................................2
      1.1. Terminology ................................................2
   2. S-BFD Target Discriminator ID AVP ...............................2
      2.1. Encoding Format ............................................3
   3. IANA Considerations .............................................4
   4. Security Considerations .........................................4
   5. References ......................................................5
      5.1. Normative References .......................................5
      5.2. Informative References .....................................5
   Acknowledgements ...................................................6
   Contributors .......................................................6
   Authors' Addresses .................................................6

1.  Introduction

   [RFC7880] defines a simplified mechanism to use Bidirectional
   Forwarding Detection (BFD) [RFC5880], referred to as Seamless
   Bidirectional Forwarding Detection (S-BFD).  The S-BFD mechanism
   depends on network nodes knowing the BFD Discriminators that each
   node in the network has reserved for this purpose.  S-BFD requires
   the usage of unique discriminators within an administrative domain.
   The use of the Layer Two Tunneling Protocol version 3 (L2TPv3)
   [RFC3931] is one possible means of advertising these discriminators.

   This document specifies the encoding to be used when S-BFD
   Discriminators are advertised using L2TPv3.

1.1.  Terminology

   The reader is expected to be very familiar with the terminology and
   protocol constructs defined in S-BFD (see Section 2 of [RFC7880]) and
   L2TPv3 (see Section 1.3 of [RFC3931]).

   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].

2.  S-BFD Target Discriminator ID AVP

   The S-BFD Target Discriminator Identifier (ID) Attribute Value Pair
   (AVP) is exchanged using the ICRQ (Incoming-Call-Request), ICRP
   (Incoming-Call-Reply), OCRQ (Outgoing-Call-Request), and OCRP
   (Outgoing-Call-Reply) control messages during session negotiation.

Govindan & Pignataro         Standards Track                    [Page 2]
RFC 7886             S-BFD Discriminators in L2TPv3            July 2016

2.1.  Encoding Format

   The S-BFD Target Discriminator ID AVP, Attribute Type 102, is an
   identifier used to advertise the S-BFD target discriminator(s)
   supported by an L2TP Control Connection Endpoint (LCCE) for the S-BFD
   reflector operation.  This AVP indicates that the advertiser
   implements an S-BFD reflector supporting the specified target
   discriminator(s) and is ready for S-BFD reflector operation.  The
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