Can't assign VLAN on a bridge interface

Question

Hi everyone, 
 
 I have a new XG 330 situated in a main rack and then 4 switches in 4 different small racks, there is also some VLAN on the network.

I bridged 4 interfaces on the firewall for the LAN but then I can't setup any VLAN interface on the created bridge. 
 If I don't bridge the interface, I can setup all my VLAN on one interface, but then how do I connect the 3 others switches to the firewall ? 
 
 I also want to avoid having to chain every switch on another one that then connect to the firewall as it will create a single point of failure. 
 Can someone point me how I can achieve this simple setup in the XG ?

LuCar Toni · Answer

Just leave the VLAN aspect for a bit. 
 If you have, lets say 3 switches. 
 Are you going to bridge 3 ports on your SG/XG and plugin all three switches to have one Setup? 
 I would say - no you wont do that. You would start to get a High availability in the switch landscape (make sure, if one switch fails, other switches will take over). 
 Currently, if one switch fails in such scenario, the whole Subnet behind this switch is dead. No matter what you are doing on the XG/SG. 
 
 I am still not sure, what use case would there be to actually using a Bridge with VLANs. 
 Maybe RED50 and bridging the Remote location to the main location and splitting VLAN, but even in such setups, why would you do that? 
 
 Most customers use LACP and connect the switch "world" to the XG and use VLAN on this LAG. 
 But to actually "simply" bridge those switches together sounds odd.