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Extensions to Support Efficient Carrying of Multicast Traffic in Layer-2 Tunneling Protocol (L2TP) (RFC4045)

IP.com Disclosure Number: IPCOM000124392D
Original Publication Date: 2005-Apr-01
Included in the Prior Art Database: 2005-Apr-19
Document File: 29 page(s) / 59K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Bourdon: AUTHOR

Abstract

The Layer Two Tunneling Protocol (L2TP) provides a method for tunneling PPP packets. This document describes an extension to L2TP, to make efficient use of L2TP tunnels within the context of deploying multicast services whose data will have to be conveyed by these tunnels.

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Network Working Group                                         G. Bourdon
Request for Comments: 4045                               

France

Telecom
Category: Experimental                                        April 2005


             Extensions to Support Efficient Carrying of
        Multicast Traffic in Layer-2 Tunneling Protocol (L2TP)

Status of This Memo

   This memo defines an Experimental Protocol for the Internet
   community.  It does not specify an Internet standard of any kind.
   Discussion and suggestions for improvement are requested.
   Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   The Layer Two Tunneling Protocol (L2TP) provides a method for
   tunneling PPP packets.  This document describes an extension to L2TP,
   to make efficient use of L2TP tunnels within the context of deploying
   multicast services whose data will have to be conveyed by these
   tunnels.

Table of Contents

   1.  Introduction..................................................  2
       1.1.  Conventions Used in This Document.......................  3
       1.2.  Terminology.............................................  3
   2.  Motivation for a Session-Based Solution.......................  4
   3.  Control Connection Establishment..............................  5
       3.1.  Negotiation Phase.......................................  5
       3.2.  Multicast Capability AVP (SCCRQ, SCCRP).................  5
   4.  L2TP Multicast Session Establishment Decision.................  6
       4.1.  Multicast States in LNS.................................  6
       4.2.  Group State Determination...............................  8
       4.3.  Triggering..............................................  9
       4.4.  Multicast Traffic Sent from Group Members............... 10
   5.  L2TP Multicast Session Opening Process........................ 11
       5.1.  Multicast-Session-Request (MSRQ)........................ 11
       5.2.  Multicast-Session-Response (MSRP)....................... 12
       5.3.  Multicast-Session-Establishment (MSE)................... 12
   6.  Session Maintenance and Management............................ 13
       6.1.  Multicast-Session-Information (MSI)..................... 13
       6.2.  Outgoing Sessions List Updates.......................... 14

Bourdon                       Experimental                      [Page 1]
RFC 4045          Efficient Multicast Traffic in L2TP         April 2005


             6.2.1.  New Outgoing Sessions AVP (MSI)................. 15
             6.2.2.  New Outgoing Sessions Acknowledgement...