@KJK Thanks, I think that points me in the right direction - the FortiGate is doing the routing in this config, so I'll need to figure out how to get the VLANs identified on there. Otherwise I need...

I'm setting up a test environment for feasibility testing before deployment, and have the following configuration: FortiGate 60F > DHCP scope 10.50.1.x on port 1, DHCP scope 192.168.80.x on port 2...