Hello.

As far as I know, the way to use your VXLAN will be using a L2 VPN. And here is my reasons:

- If you want to use VXLAN inside your DC you will need to use NSX-V, which is not longer supported.

- NSX-T (now in NSX-T version 4, is re-branded as NSX only) uses Geneve.

- In the internal communication, we have the concept of transport zones, you are going to have overlay and vlan ones. The overlay is the internal transport zone for overlay VNIS and the VLAN is the transport zone for the uplinks.

- Now, there is the concept of Federation, 

https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.2/administration/GUID-D5B6DC79-6733-44A7-8072-...

with federation we can have multiple sites using global devices.

But to answer your question, in order to have overlay you need NSX to achieve it.

Hope this answers your question.

Best Regards.

SG