|Research Unit in Networking|
, E. Klovning1 and A. Danthine2
1 Telenor R&D, Norway
AbstractWe 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.
KeywordsAsynchronous Transfer Mode (ATM), measurements, TCP, Usage Parameter Control (UPC), Variable Bit Rate (VBR) traffic contract
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