Report Number: CSL-TR-97-720
Institution: Stanford University, Computer Systems Laboratory
Title: A Simulation Study of IP Switching
Author: Lin, Steven
Author: McKeown, Nick
Date: April 1997
Abstract: Recently there has been much interest in combining the speed
of layer-2 switching with the features of layer-3 routing.
This has been prompted by numerous proposals, including: IP
Switching, Tag Switching, ARIS, CSR, and IP over ATM. In this
paper, we study IP Switching and evaluate the performance
claims made by Newman et al. In particular, using nine
network traces, we study how well IP Switching performs with
traffic found in campus, corporate, and Internet Service
Provider (ISP) environments. Our main finding is that IP
Switching will lead to a high proportion of datagrams that
are switched; over 75% in all of the environments we studied.
We also investigate the effects that different flow
classifiers and various timer values have on performance, and
note that some choices can result in a large VC space
requirement. Finally, we present recommendations for the flow
classifier and timer values, as a function of the VC space of
the switch and the network environment being served.