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PPP Over AAL5 (RFC2364)

IP.com Disclosure Number: IPCOM000002935D
Original Publication Date: 1998-Jul-01
Included in the Prior Art Database: 2019-Feb-15
Document File: 12 page(s) / 15K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Gross: AUTHOR [+4]

Related Documents

10.17487/RFC2364: DOI


This document describes the use of ATM Adaptation Layer 5 (AAL5) for framing PPP encapsulated packets. [STANDARDS-TRACK]

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 17% of the total text.

Network Working Group G. Gross Request for Comments: 2364 Lucent Technologies Category: Standards Track M. Kaycee Paradyne A. Lin Shasta Networks A. Malis Ascend Communications J. Stephens Cayman Systems July 1998


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 (1998). All Rights Reserved.


The Point-to-Point Protocol (PPP) [1] provides a standard method for transporting multi-protocol datagrams over point-to-point links.

This document describes the use of ATM Adaptation Layer 5 (AAL5) for framing PPP encapsulated packets.


This specification is intended for those implementations which desire to use the facilities which are defined for PPP, such as the Link Control Protocol, Network-layer Control Protocols, authentication, and compression. These capabilities require a point-to-point relationship between the peers, and are not designed for the multi- point relationships which are available in ATM and other multi-access environments.

Gross, et. al. Standards Track [Page 1]

RFC 2364 PPP Over AAL5 July 1998

1. Introduction

ATM AAL5 protocol is designed to provide virtual connections between end stations attached to the same network. These connections offer a packet delivery service that includes error detection, but does not do error correction.

Most existing implementations of PPP use ISO 3309 HDLC as a basis for their framing [3].

When an ATM network is configured with point-to-point connections, PPP can use AAL5 as a framing mechanism.

2. Conventions

The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD, SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this document, are to be interpreted as described in [10].

3. AAL5 Layer Service Interface

The PPP layer treats the underlying ATM AAL5 layer service as a bit- synchronous point-to-point link. In this context, the PPP link corresponds to an ATM AAL5 virtual connection. The virtual connection MUST be full-duplex, point to point, and it MAY be either dedicated (i.e. permanent, set up by provisioning) or switched (set up on demand). In addition, the PPP/AAL5 service interface boundary MUST meet the following requirements:

Interface Format - The PPP/AAL5 layer boundary presents an octet service interface to the AAL5 layer. There is no provision for sub-octets to be supplied or accepted.

Transmission Rate - The PPP layer does not impose any restrictions regarding transmission rate or the underlying ATM layer traffic descriptor parameters.

Control Signals - The AAL5 layer MUST provide control signals to the PPP layer which indicate when the virtual connection link has become connected or d...