I'm not completely familiar with the Exchange iApp but I do know that, unless there is a specific configuration in the template that allows you to select the appropriate VLAN for the VIP, you have only two choices:
- Modify the iApp template to add a choice for VLAN/Tunnel. (Note that modifying an F5-supplied template may affect support terms. Please check with your F5 support representative.)
- Turn off Strict Updates for the Application Service so that you can modify the VLAN setting on the virtual server itself. (You probably want to turn Strict Updates back on again, or completely manage the application independently of the iApp application service.) Note that, if you do turn off Strict Updates, make the change to the VIP, and then subsequently reconfigure the Application Service, your VLAN setting change may be undone. You would have to remember to manually reapply the change again.