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Layer 2 Tunneling Protocol (L2TP) Active Discovery Relay for PPP over Ethernet (PPPoE) (RFC3817)

IP.com Disclosure Number: IPCOM000029174D
Original Publication Date: 2004-Jun-01
Included in the Prior Art Database: 2004-Jun-17
Document File: 18 page(s) / 38K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

W. Townsley: AUTHOR [+2]

Abstract

The Point-to-Point Protocol (PPP) provides a standard method for transporting multi-protocol datagrams over point-to-point links. Layer Two Tunneling Protocol (L2TP), facilitates the tunneling of PPP packets across an intervening packet-switched network. And yet a third protocol, PPP over Ethernet (PPPoE) describes how to build PPP sessions and to encapsulate PPP packets over Ethernet.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 7% of the total text.

Network Working Group                                        W. Townsley

Request for Comments: 3817                                 cisco Systems

Category: Informational                                      R. da Silva

                                                         AOL Time Warner

                                                               June 2004

        Layer 2 Tunneling Protocol (L2TP) Active Discovery Relay

                     for PPP over Ethernet (PPPoE)

Status of this Memo

   This memo provides information for the Internet community.  It does

   not specify an Internet standard of any kind.  Distribution of this

   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2004).

Abstract

   The Point-to-Point Protocol (PPP) provides a standard method for

   transporting multi-protocol datagrams over point-to-point links.

   Layer Two Tunneling Protocol (L2TP), facilitates the tunneling of PPP

   packets across an intervening packet-switched network.  And yet a

   third protocol, PPP over Ethernet (PPPoE) describes how to build PPP

   sessions and to encapsulate PPP packets over Ethernet.

   L2TP Active Discovery Relay for PPPoE describes a method to relay

   Active Discovery and Service Selection functionality from PPPoE over

   the reliable control channel within L2TP.  Two new L2TP control

   message types and associated PPPoE-specific Attribute Value Pairs

   (AVPs) for L2TP are defined.  This relay mechanism provides enhanced

   integration of a specific feature in the PPPoE tunneling protocol

   with L2TP.

Table of Contents

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

   2.  Protocol Operation . . . . . . . . . . . . . . . . . . . . . .  2

       2.1.  PPPoE Active Discovery Stage . . . . . . . . . . . . . .  3

       2.2.  Session Establishment and Teardown . . . . . . . . . . .  4

       2.3.  PPPoE PAD Message Exchange Coherency . . . . . . . . . .  6

       2.4.  PPPoE Service Relay Capabilities Negotiation . . . . . .  8

             2.4.1.  PPPoE Service Relay Response Capability AVP. . .  8

             2.4.2.  PPPoE Service Relay Forward Capability AVP . . .  9

   3.  L2TP Service Relay Messages. . . . . . . . . . . . . . . . . .  9

Townsley & da Silva          Informational                      [Page 1]

RFC 3817                  L2TP Relay for PPPoE                 June 2004

       3.1.  Service Relay Request Message (SRRQ) . . . . . . . . . .  9

       3.2.  Service Relay Reply Message (SRRP) . . . . . . . . . . . 10

   4.  ...