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.
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