Layer Two Tunneling Protocol version 3 - Setup of Time-Division Multiplexing (TDM) Pseudowires
RFC 5611

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Network Working Group                                      A. Vainshtein
Request for Comments: 5611                                   ECI Telecom
Category: Standards Track                                     S. Galtzur
                                                               Rebellion
                                                             August 2009

               Layer Two Tunneling Protocol version 3 -
         Setup of Time-Division Multiplexing (TDM) Pseudowires

Abstract

   This document defines extensions to the Layer Two Tunneling Protocol
   version 3 (L2TPv3) for support of structure-agnostic and structure-
   aware (Circuit Emulation Service over Packet Switched Network
   (CESoPSN) style) Time-Division Multiplexing (TDM) pseudowires.
   Support of structure-aware (Time-Division Multiplexing over IP
   (TDMoIP) style) pseudowires over L2TPv3 is left for further study.

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

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   document authors.  All rights reserved.

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   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may

Vainshtein & Galtzur        Standards Track                     [Page 1]
RFC 5611                    TDM over L2TPv3                  August 2009

   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................2
      1.1. Conventions Used in This Document ..........................3
   2. L2TPv3 Extensions ...............................................3
      2.1. TDM PW Attribute-Value Pair (AVP) (ICRQ, OCRQ) .............4
      2.2. RTP Attribute-Value Pair (AVP) (ICRQ, OCRQ, ICRP, OCRP) ....6
      2.3. Changes in the Control Connection Management AVPs ..........7
      2.4. Changes in the Session Management AVPs .....................7
   3. Creation of the TDM Pseudowire Session ..........................7
   4. IANA Considerations .............................................9
   5. Congestion Control ..............................................9
   6. Security Considerations ........................................10
   7. Acknowledgements ...............................................10
   8. References .....................................................10
      8.1. Normative References ......................................10
      8.2. Informative References ....................................10

1.  Introduction

   This document defines extensions to the Layer Two Tunneling Protocol
   Version 3 (L2TPv3) for support of structure-agnostic [RFC4553] and
   structure-aware (CESoPSN style, see [RFC5086]) Time-Division
   Multiplexing (TDM) pseudowires.  Structure-agnostic encapsulation of
   TDM bit-streams over L2TPv3 is described in [RFC4553], Figure 2b;
   Circuit Emulation Service over Packet Switched Networks (CESoPSN),
   structure-aware encapsulation is described in [RFC5086], Figures 1c
   (TDM data packets) and 4a (CE application signaling packets).
   However, the order of the CESoPSN Control Word (CW) and RTP header
   (if it is used) MUST match between the TDM data and CE signaling
   packets.

   Setup of structure-aware TDM pseudowires using the encapsulations
   described in [RFC5087] has been left for further study.

   Setup and maintenance of TDM pseudowires (PWs) in MPLS networks using
   LDP is described in [RFC5287].

Vainshtein & Galtzur        Standards Track                     [Page 2]
RFC 5611                    TDM over L2TPv3                  August 2009

1.1.  Conventions Used in This Document

   In this document, we refer to the "control plane" as meaning the
   packets that contain control information (via Attribute-Value Pairs