Optimum Switching

In 1995, Cisco introduced the 7500 series. Refinements relevant to switching included the combination of both the route and the switch processors on a single card, and a new CyBus of 1.077 Gbit/s capacity that was backward-compatible with the cbus interface processors of the 7000 series.

A new route-cache mechanism, based on an m-trie lookup algorithm, provided switching capacity similar to the 7000 series with SSP—around 270,000 pps. Operationally, however, it performed the same role as autonomous switching: offloading switching functions from the Route Switch Processor (RSP). Optimum switching is the default on the 7500 series interfaces.

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