Switch Loop Prevention

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2019/08/14 11:37:15 (permalink)
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Switch Loop Prevention

I am trying to design a new FGT-1500D deployment to replace a Juniper firewall.  The firewall connects to a pair of switches in one computer room and another pair of switches in another computer room.  The Juniper is using redundant links to ensure only one up-link is active to each switch pair.
 
             ____ [Switch A]
            /                >--- {Server 1}
           /  ___ [Switch B]
          /__/
[Firewall] __
          \  \___ [Switch C]
           \                 >--- {Server 2}
            \____ [Switch D]
FIGURE1: ASCII Topology
 
Going forward I would like to span a VLAN between both computer rooms.  other than using a software switch and using spanning-tree are there other options I should consider (EAPS, MLAG, LACP, etc...)?
 
There is no connectivity between the switch pairs (though it could be added).  I would like to do this with the minimum cabling required, the firewalls will be HA(a-p) and the distance between computer rooms requires fiber runs. 
 
Worth noting, the servers attached to the switch is what effectively would create a loop.  Any thoughts would be appreciated.  
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