I am just looking at your diagram, and I am thinking you should be able to use Layer3 trunk as the interface, and than create sub-interfaces per VLAN to control the traffic of particular vlans.
That's how I am running my lab, a bit smaller configuration in terms of devices but I am basically connecting with Layer3 untagged interface to my trunk port, and than I have L3 sub-interfaces with VLAN tags and IP addresses that are effective gateways for VLANs in virtual environment, that way I am using full bandwidth of the interface and just doing logical routing with VLANs and Virtual router inside.
Combining L2 and L3 interface configuration per interface is not possible, but there are plenty of other solutions - sixtuplet that is used to evaluate session does NOT include interface: what matters for session matching are IP addresses, ports, zone and protocol. So, as long as your packets match those six items does not really matter what interface they came in or went out through.
Another thing is that L2 does not offer the best inspection and visibility into traffic, you should always try to have L3 interfaces and inspection rather than L2 or vwire/tap inspection.
I have used instances where I've built a single "trunk-1" port with multiple L3 tagged vlans (sub-intrfcs). But as you can see I would like to add another physical port "trunk-2" carrying the same vlans. Our core switch/routers can do this (add multiple physical interfaces to any vlan and each physical interface can carry multiple (tagged) vlans). But of course we do not get the level of inspection/allow/deny as the 5050 will provide.
thnks for the input
Just some other things to consider.
Aggregate interfaces on the PAN
Also you mentioned you were running on 6.1.9, you may want to think about upgrading or protecting the management interface.
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