Sorry I didn't clarify. Switches are TP-Link L2 Managed switches and the firewall is a Zywall 20W. I never said anything about 3 vlans, so not sure where that came from. My thought process was that I set up a port Vlan on siwtch a and have it tagged and then on Switch B put the port which connects to my firewall in the same Vlan. That would be a total of 2 vlans, 1 on each switch.