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Frame Relay over Layer 2 Tunneling Protocol Version 3 (L2TPv3)
RFC 4591

Document type: RFC - Proposed Standard (August 2006; Errata)
Updated by RFC 5641
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Consensus: Unknown
Document shepherd: No shepherd assigned

IESG State: RFC 4591 (Proposed Standard)
Responsible AD: Margaret Wasserman
Send notices to: rdasilva@va.rr.com, igoyret@lucent.com

Network Working Group                                        M. Townsley
Request for Comments: 4591                                     G. Wilkie
Category: Standards Track                                       S. Booth
                                                               S. Bryant
                                                           Cisco Systems
                                                                  J. Lau
                                                               July 2006

     Frame Relay over Layer 2 Tunneling Protocol Version 3 (L2TPv3)

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2006).

Abstract

   The Layer 2 Tunneling Protocol, Version 3, (L2TPv3) defines a
   protocol for tunneling a variety of data link protocols over IP
   networks.  This document describes the specifics of how to tunnel
   Frame Relay over L2TPv3, including frame encapsulation, virtual-
   circuit creation and deletion, and status change notification.

Townsley, et al.            Standards Track                     [Page 1]
RFC 4591                Frame Relay over L2TPv3                July 2006

Table of Contents

   1. Introduction ....................................................2
      1.1. Abbreviations ..............................................3
      1.2. Specification of Requirements ..............................3
   2. Control Connection Establishment ................................3
   3. PVC Status Notification and Session Establishment ...............3
      3.1. L2TPv3 Session Establishment ...............................4
      3.2. L2TPv3 Session Teardown ....................................5
      3.3. L2TPv3 Session Maintenance .................................5
      3.4. Use of the Circuit Status AVP for Frame Relay ..............6
      3.5. Frame Relay Header Length AVP ..............................7
   4. Encapsulation ...................................................7
      4.1. Data Packet Encapsulation ..................................7
      4.2. Data Packet Sequencing .....................................9
      4.3. MTU Considerations .........................................9
   5. Applicability Statement ........................................10
   6. Security Considerations ........................................10
   7. IANA Considerations ............................................11
      7.1. Pseudowire Type ...........................................11
      7.2. Result Code AVP Values ....................................11
      7.3. Control Message Attribute Value Pairs (AVPs) ..............11
   8. Acknowledgements ...............................................11
   9. References .....................................................12
      9.1. Normative References ......................................12
      9.2. Informative References ....................................12

1.  Introduction

   [RFC3931] defines a base protocol for Layer 2 Tunneling over IP
   networks.  This document defines the specifics necessary for
   tunneling Frame Relay over L2TPv3.  Such emulated circuits are
   referred to as Frame Relay Pseudowires (FRPWs).

   Protocol specifics defined in this document for L2TPv3 FRPWs
   operating in a "virtual circuit-to-virtual circuit" mode include
   those necessary for frame encapsulation, PVC creation and deletion,
   and status change notification.  Frame Relay traffic may also be
   transported in a "port-to-port" or "interface-to-interface" fashion
   using High-Level Data Link Control (HDLC) Pseudowires as defined in
   [RFC4349].  Support for Switched Virtual Circuits (SVCs) and
   Switched/Soft Permanent Virtual Circuits (SPVCs) are outside the
   scope of this document.

   The reader is expected to be very familiar with the terminology and
   protocol constructs defined in [RFC3931].

Townsley, et al.            Standards Track                     [Page 2]
RFC 4591                Frame Relay over L2TPv3                July 2006

1.1.  Abbreviations

   FR    Frame Relay
   FRPW  Frame Relay Pseudowire
   LCCE  L2TP Control Connection Endpoint (See [RFC3931])
   PVC   Permanent virtual circuit
   PW    Pseudowire
   VC    Virtual circuit

1.2. Specification of Requirements

   In this document, several words are used to signify the requirements

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