Abstract:

In order to meet the requirement for router buffer size in high bandwidth-delay networks, five typical buffer-sizing methods based on the TCP model are analyzed via the NS2 simulation, and the effects of various highspeed TCP protocols and active queue management （AQM） mechanisms on the buffer-sizing methods in high bandwidth-delay networks are discussed in detail. Simulated results show that ： （ 1 ） the buffer-sizing methods based on different assumptions adapt to different network environments; （2） the validity of the existing cache mechanisms depends on the ratio of the bandwidth-delay product to the flow number; and （3） when high-speed TCP protocols and AQM mechanisms are used in high bandwidth-delay networks, the buffer size is greatly reduced.

Key words: buffer requirement, high bandwidth-delay network, Transfer Control Protocol, active queue manage- ment