RFC 3308 (rfc3308) - Page 2 of 10

Layer Two Tunneling Protocol (L2TP) Differentiated Services Extension

RFC 3308                L2TP Diffserv Extension            November 2002


Table of Contents

   1.   Specification of Requirements ...............................  2
   2.   Introduction ................................................  2
   3.   Control Connection Operation ................................  3
   3.1. Control Connection DS AVP (SCCRQ, SCCRP) ....................  4
   4.   Session Operation ...........................................  4
   4.1. Session DS AVP (ICRQ, ICRP, OCRQ, OCRP) .....................  6
   5.   DS AVPs Correlation .........................................  6
   6.   PHB Encoding ................................................  6
   7.   DSCP Selection ..............................................  7
   8.   Packet Reordering and Sequence Numbers ......................  7
   9.   Crossing Differentiated Services Boundaries .................  7
   10.  IANA Considerations .........................................  8
   11.  Security Considerations .....................................  8
   12.  Acknowledgements ............................................  8
   13.  References ..................................................  8
   14.  Authors' Addresses ..........................................  9
   15.  Full Copyright Statement .................................... 10

1. Specification of Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC 2119].

2. Introduction

   The L2TP specification currently provides no mechanism for supporting
   diffserv (DS).  This document describes mechanisms that enable L2TP
   to indicate desired PHB code, as defined in [RFC 3140], to be
   associated with an L2TP control connection, as well as individual
   sessions within an L2TP tunnel.

   The actual bit interpretation of the DS field is beyond the scope of
   this document, and is purposefully omitted.  This document is
   concerned only with defining a uniform exchange and subsequent
   mapping mechanism for the DS AVPs.













Calhoun, et. al.            Standards Track