MEASUREMENT-BASED PERFORMANCE EVALUATION OF AN ATM SWITCH WITH EXTERNAL MULTICASTING ENGINE AND MULTIPLE-PRIORITY CLASSES

This paper uses measurement-based traffic models to evaluate a shared- memory ATM switch with 32 x 32 155 Mbit/s ports and an external multic asting engine; this is the design of Cisco System's next-generation AT M switch, the LightStream-1010 (LS-1010), Assuming that the multicast traffic can take approximately 30% of the total switch load, we find t hat an external multicasting engine requires a 32 (8) cell buffer at r eplication rate of 16 (64) cells per cell service time, We discover th at in a multimedia environment, the shared-memory architecture require s 10-30 times less total memory than the bus architecture; a 64 K cell buffer is sufficient to handle 90% utilization with the nonuniform tr affic that we investigated, Multiple-priority classes are considered.