Xerox

In: Business and Management

Submitted By pviswanath
Words 7430
Pages 30
On the Use of Quality of Service in IP over ATM
Bruce A. Mah1 bmah@CS.Berkeley.EDU The Tenet Group
Computer Science Division
University of California at Berkeley
Berkeley, CA 94720-1776
(510) 642-8905 (voice)
(510) 642-5775 (fax)

ABSTRACT
The future Internet will very likely include some components based on Asynchronous Transfer
Mode (ATM), as well as existing network technologies. This environment produces the possibility of using one of the strengths of ATM (namely, quality-of-service guarantees) to improve the performance of Internet traffic. In this report, we document some of our work in progress on the use of performance-guaranteed ATM virtual circuits to carry IP datagrams. We are currently addressing the implications of various IP-over-ATM strategies on network performance, particularly those aspects relating to quality of service, multiplexing, and virtual circuit management. We are evaluating these performance effects using INSANE, a new object-oriented, discrete-event network simulator.

1 Introduction
The construction and deployment of Asynchronous Transfer Mode (ATM) networks are a recent development in the field of computer communications. Integrating this new technology into the existing Internet requires schemes for managing the transmission of IP datagrams over ATM networks. Such schemes ideally will take advantage of the strengths of ATM, such as its capability for supporting quality of service guarantees, while effectively bridging the gap between the data forwarding models of ATM (virtual circuits) and the Internet (datagrams).
We are investigating the use of performance-guaranteed ATM virtual circuits to carry Internet traffic in a heterogeneous internetwork environment. In particular, we are examining the performance effects of different quality of service mappings, policies for multiplexing IP conversations onto virtual…...

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