Abstract
ULg Research Unit in Networking RUN
Abstract


Is VBR a solution for an ATM LAN ?

O. Bonaventure1 , E. Klovning2 and A. Danthine1

1 Research unit in Networking, EECS department, University of Liège, Belgium
2 Telenor R&D, Norway
3 Research unit in Networking, EECS department, University of Liège, Belgium

(1996)

Abstract

We present and discuss detailed measurements showing how TCP behaves in an ATM LAN where a Variable Bit Rate (VBR) traffic contract is enforced by a Usage Parameter Control (UPC) mechanism. These measurements show that TCP has a lot of difficulties to adapt its behaviour to such a traffic contract. In our environment, TCP only achieved a 10% utilisation of a 10 Mbps VBR VC. We then discuss and evaluate possible solutions to improve this low utilisation of the reserved bandwidth.

Keywords

Asynchronous Transfer Mode (ATM), measurements, TCP, Usage Parameter Control (UPC), Variable Bit Rate (VBR) traffic contract

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