trunking 2 BigIP 1000's

I am trying to Trunk 2 BigIP 1000's to create one logical switch. The problem I have is that I have multiple VLANS on the switch, so when I try to ping server1 on VLAN1 on switch1 from Server2 on VLAN1 on switch2 I get no response. I have tried to tag the ports but I still have no luck in making this work??? Any Ideas?