Yes, have your L3 switch do the inter-vlan routing, that way your core will just be used for routing between your various networks. It would be inefficient to extend your VLANs as far as your core. Consider that by having your core doing the inter-vlan routing, it would also inherit the broadcasts that are associated with them. You want your core to be as unencumbered as possible. So basically if you follow Cisco's hierarchical model, you'll see this.
The access layer is for connecting workstations. This is your wiring closet that contains your L2 switches. The L2 switch should connect to the distribution layer, which should be a L3 switch that will have inter-vlan routing, Quality of Service, access control lists, multicasting, etc. Finally, your L3 switches should connect to the core layer, which is the high speed traffic forwarding devices. These can be ATM switches, routers, it could be MPLS, and so on. This layer is just concerned with connecting networks as quickly as possible.
Re: VLAN Routing at Aggregation or Core?
12 years 2 months ago #14668