This article explains the environmental configurations that determine if the NSX-T Edge TEP and the ESXi TEP can be on the same network.
Note: Invalid configuration may result in BFD tunnels going down between Edges and Hosts while Host to Host and Edge to Edges remain up. Alarm - "Edge tunnels down" .
If using a VLAN segment on an NSX prepared VDS, adding only a single VLAN to the segment will result in the segment processing traffic for that VLAN only and stripping the tag for ingress traffic and adding the tag for egress traffic. This will result in the edge TEPs being unable to communicate as they require a trunked segment. This can be achieved by applying a range to the VLAN value (inclusive of your required VLAN) .