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Layer Two Tunneling Protocol (L2TP) over Frame Relay (RFC3070)

IP.com Disclosure Number: IPCOM000005264D
Original Publication Date: 2001-Feb-01
Included in the Prior Art Database: 2001-Aug-20
Document File: 8 page(s) / 13K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

V. Rawat: AUTHOR [+4]

Abstract

Layer Two Tunneling Protocol (L2TP) describes a mechanism to tunnel Point-to-Point (PPP) sessions. The protocol has been designed to be independent of the media it runs over. The base specification describes how it should be implemented to run over the User Datagram Protocol (UDP) and the Internet Protocol (IP). This document describes how L2TP is implemented over Frame Relay Permanent Virtual Circuits (PVCs) and Switched Virtual Circuits (SVCs).

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 28% of the total text.

Network Working Group V. Rawat Request for Comments: 3070 ONI Systems, Inc. Category: Standards Track R. Tio

S. Nanji Redback Networks, Inc.

R. Verma Deloitte Consulting

February 2001

Layer Two Tunneling Protocol (L2TP) over Frame Relay

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 (2001). All Rights Reserved.

Abstract

Layer Two Tunneling Protocol (L2TP) describes a mechanism to tunnel Point-to-Point (PPP) sessions. The protocol has been designed to be independent of the media it runs over. The base specification describes how it should be implemented to run over the User Datagram Protocol (UDP) and the Internet Protocol (IP). This document describes how L2TP is implemented over Frame Relay Permanent Virtual Circuits (PVCs) and Switched Virtual Circuits (SVCs).

Applicability

This specification is intended for those implementations which desire to use facilities which are defined for L2TP and applies only to the use of Frame Relay pont-to-point circuits.

1.0 Introduction

L2TP [1] defines a general purpose mechanism for tunneling PPP over various media. By design, it insulates L2TP operation from the details of the media over which it operates. The base protocol specification illustrates how L2TP may be used in IP environments. This document specifies the encapsulation of L2TP over native Frame Relay and addresses relevant issues.

Rawat, et al. Standards Track [Page 1]

RFC 3070 L2TP over Frame Relay February 2001

2.0 Conventions

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].

3.0 Problem Space Overview

In this section we describe in high level terms the scope of the problem being addressed. Topology:

PSTN Frame Relay User--| |----LAC LNS LANs ISDN Cloud

An L2TP Access Concentrator (LAC) is a device attached to the switched network fabric (e.g., PSTN or ISDN) or co-located with a PPP end system capable of handling the L2TP protocol. The LAC need only implement the media over which L2TP is to operate to pass traffic to one or more LNS's. It may tunnel any protocol carried within PPP.

L2TP Network Server (LNS) operates on any platform capable of PPP termination. The LNS handles the server side of the L2TP protocol. L2TP is connection-oriented. The LNS and LAC maintain state for each user that is attached to an LAC. A session is created when an end- to-end PPP connection is a...