Anyone can advice me on this ? There are four dept in our customer network. Each dept has one Cat4507 which connected to the core (Cat6509) via fibre link. There are few LAN connected to each dept. switch including the wireless network. Those LAN are on different vlan/subnet. While those LAN are local to each dept. switch but the wireless network are not. All wireless on every dept are in the same network. How to go about this ? How to configure the backbone in order to make it work ? The backbone itself is on L3.