SVIs are used on L3 switches and are created as the L3 interface for a vlan. Without an SVI members of a vlan can communicate with members of the same vlan but they cannot communicate with devices on any other vlan.
Subinterfaces can be used on L3 switches but generally SVIs are the way to go. Subinterfaces are far more common on routers. Again they can be used to route between networks and a common use for them is routing on a stick ie. you have multiple vlans on a L2 switch and you connect this to a router and then configure a subinterface per vlan. This is the equivalent of configuring an SVI for each vlan on a switch.
But subinterfaces are not just used for ethernet - they are often used oon serial interfaces for things like Frame Relay as well.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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