Abstract
In this paper the influence of the chosen topology as well as the choice of the TCP window size used in end-systems on the performance of switched LANs has been investigated using simulation modelling. Four LAN topologies comprising servers, switches and clients are examined. Models of the TCP and UDP protocols are used in order to generate traffic for the investigations. Special attention has been paid to the window size, showing its potentially negative impact on the buffer consumption in interconnecting LAN switches. The effect of enabling the 802.3x hop-by-hop switch flow control on LAN performance has been analysed as well as the interaction of the TCP flow control used in end-systems with the hop-by-hop flow control used in switches.
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