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Layer-Two Tunneling Protocol Extensions for PPP Link Control Protocol Negotiation (RFC3437)

IP.com Disclosure Number: IPCOM000010619D
Original Publication Date: 2002-Dec-01
Included in the Prior Art Database: 2002-Dec-26
Document File: 11 page(s) / 21K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Palter: AUTHOR [+2]

Abstract

This document defines extensions to the Layer Two Tunneling Protocol (L2TP) for enhanced support of link-specific Point to Point Protocol (PPP) options. PPP endpoints typically have direct access to the common physical media connecting them and thus have detailed knowledge about the media that is in use. When the L2TP is used, the two PPP peers are no longer directly connected over the same physical media. Instead, L2TP inserts a virtual connection over some or all of the PPP connection by tunneling PPP frames over a packet switched network such as IP. Under some conditions, an L2TP endpoint may need to negotiate PPP Link Control Protocol (LCP) options at a location which may not have access to all of the media information necessary for proper participation in the LCP negotiation. This document provides a mechanism for communicating desired LCP options between L2TP endpoints in advance of PPP LCP negotiation at the far end of an L2TP tunnel, as well as a mechanism for communicating the negotiated LCP options back to where the native PPP link resides.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 13% of the total text.

Network Working Group                                          W. Palter

Request for Comments: 3437                                       zev.net

Category: Standards Track                                    W. Townsley

                                                           Cisco Systems

                                                           December 2002

              Layer-Two Tunneling Protocol Extensions for

                 PPP Link Control Protocol Negotiation

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 defines extensions to the Layer Two Tunneling Protocol

   (L2TP) for enhanced support of link-specific Point to Point Protocol

   (PPP) options.  PPP endpoints typically have direct access to the

   common physical media connecting them and thus have detailed

   knowledge about the media that is in use.  When the L2TP is used, the

   two PPP peers are no longer directly connected over the same physical

   media.  Instead, L2TP inserts a virtual connection over some or all

   of the PPP connection by tunneling PPP frames over a packet switched

   network such as IP.  Under some conditions, an L2TP endpoint may need

   to negotiate PPP Link Control Protocol (LCP) options at a location

   which may not have access to all of the media information necessary

   for proper participation in the LCP negotiation.  This document

   provides a mechanism for communicating desired LCP options between

   L2TP endpoints in advance of PPP LCP negotiation at the far end of an

   L2TP tunnel, as well as a mechanism for communicating the negotiated

   LCP options back to where the native PPP link resides.

Palter & Townsley           Standards Track                     [Page 1]

RFC 3437        L2TP Extensions for PPP LCP Negotiation    December 2002

Table of Contents

   1. Introduction...............................................  2

     1.1 Specification of Requirements...........................  3

   2. LCP Options From LAC to LNS................................  3

     2.1 LCP Want Options (iccn, occn)...........................  4

     2.2 LCP Allow Options (iccn, occn)..........................  6

     2.3 LCP Options From LNS to LAC.............................  7

   3. Security Consideration...