Performance and Buffering Requirements of Internet Protocols over ATM ABR and UBR Services
Shiv Kalyanaraman, Raj Jain, Sonia Fahmy, Rohit Goyal, Seong-Cheol Kim · 1998
ATM networks are quickly being adopted as backbones over various parts of the Internet. This article studies the dynamics and performance of the TCP/IP protocol over the ABR and UBR services of ATM networks, specifically the buffering requirements in the ATM switches as well as the ATM edge (large bit pipes) where traffic is aggre-devices. It is shown that with a good switch algorithm, ABR pushes congestion to the gated. With UBR, ATM switches edges of the ATM network while UBR leaves it inside the ATM portion. As a result, the behave similar to legacy routers, and switch ABR buffer requirement for zero-packet-loss high-throughput TCP transmission is a most of the congestion control is exer-sublinear function of the number of TCP connections. cised by TCP. It is interesting to compare the performance of TCP over ith the proliference of multimedia traffic over the W Internet, it seems natural to move over to ATM ABR and UBR. We find that TCP performs best when it does not experience packet loss and we