To route between VLANs, you need an RP. When setting up routing between VLANs, first create your VLANs and assign switch ports to them; second, create your trunks; third, configure routing. An RP can be internal or external. If the RP is external and has a trunk connection to a switch, it is called a router-on-a-stick. This type of RP is configured using subinterfaces. For an internal RP, a Catalyst switch supports two routing interfaces: routed and SVI. An SVI is typically used and is created with the interface vlan command.

MLS allows Layer 2 and Layer 3 hardware switching to exist in the same chassis. The first packet is routed in software and all other packets in the same connection are rewritten in hardware and switched at Layer ...

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