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 32×32 155 Mbit/s ports and an external multicasting engine; this is the design of Cisco System´s next-generation ATM switch, the LightStream-1010 (LS-1010). Assuming that the multicast traffic can take approximately 30% of the total switch load, we find that an external multicasting engine requires a 32 (8) cell buffer at a replication rate of 16 (64) cells per cell service time. We discover that in a multimedia environment, the shared-memory architecture requires 10-30 times less total memory than the bus architecture; a 64 K cell buffer is sufficient to handle 90% utilization with the nonuniform traffic that we investigated. Multiple-priority classes are considered