The L3 switches have been optimized for these functions will always be faster than than say a 2821 . Also if you use subinterfaces everything will be coming down the same pipe to be routed as opposed to being routed in the 4506.
The advantage to L3 switching over routing is that your L3 switch can route data at its wire speed vs. the uplink speed on the router.
Now your router doesnt advertise VLAN's at all. thats a function of VTP, or VLAN Trunking Protocol. It listens for frames encoded with a 802.1Q Tag (thats what the encapsulation statement does in each sub int). What you would have to is shut down the on the 2821's.
And I'm assuming the 2821 provide connectivity to your wan, so i would keep the 2821 handling that side of life.
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