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A router doesnt have a Supervisor Engine. whereas a switch requires a supervisor Engine. A Switch like 6500 and 4500 can't work without a Supervisor Engine.

A Sup Engine works like a brain of the L3 chassis type switches.

All the data forwarding decisions are take by the Sup Engine. suppose you have a service module based switch like 6500 and 4500 switch then by just upgrading the service module can help you enhance the switching capacity to 10G from 1G. If using Sup Engine 720.

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