RFC 3308 (rfc3308) - Page 1 of 10

Layer Two Tunneling Protocol (L2TP) Differentiated Services Extension

Network Working Group                                         P. Calhoun
Request for Comments: 3308                          Black Storm Networks
Category: Standards Track                                         W. Luo
                                                     Cisco Systems, Inc.
                                                            D. McPherson
                                                                     TCB
                                                               K. Peirce
                                                   Malibu Networks, Inc.
                                                          November 2002


                  Layer Two Tunneling Protocol (L2TP)
                   Differentiated Services Extension

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 (2002).  All Rights Reserved.

Abstract

   This document describes mechanisms which enable the Layer Two
   Tunneling Protocol (L2TP) to negotiate desired Per Hop Behavior (PHB)
   code for the L2TP control connection, as well as individual sessions
   within an L2TP tunnel.

   L2TP provides a standard method for tunneling PPP packets.  The
   current specification provides no provisions for supporting
   Differentiated Services (diffserv) over the L2TP control connection
   or subsequent data sessions.  As a result, no standard mechanism
   currently exists within L2TP to provide L2TP protocol negotiations
   for service discrimination.












Calhoun, et. al.            Standards Track