I have a 2821 router connected to a 2950 switch. On the 2821 I configured sub-interfaces. On the 2950 I configured 4 VLAN's. The port that connects to the router I configured as a trunk port. The problem I am having is on the 2950 it will only let me have 1 active VLAN. If a VLAN is active and then I enable one of the other VLAN's the other shuts down. Hmmmm I have deploy the same router on a stick with 2960's and they do not function this way. Is this how 2950's function? Would I need a layer 3 switch like a 3550?