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.
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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
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