I have 2 sites approx 15 miles apart. We have an SBC gigaman circut between the 2 sites. Each site has a 4507 that manages vtp for the specific site. The master site sends an ospf default information originate to enable routing (there is a backup T1 for failover). I want to have some private network run between the two sites. I know I can add a switch on each and and have the pair do vlan trunking. Does anyone have any alternatives?