Hi, is this for NSX for vSphere?
Are you referring to the hardware (Juniper) VXLAN control plane?
The VXLAN control plane in NSX is managed by NSX and when speaking about integration, OVSDB is used for NSX to do Hardware VTEP integration with the hardware switches.
There is no EVPN within the NSXBayu Wibowo | vExpert NSX, VCIX6-DCV/NV, Cisco Champion, AWS-SAA
Author of VMware NSX Cookbook http://bit.ly/NSXCookbook
https://nz.linkedin.com/in/bayupw | twitter @bayupw