Question: what is nve in vxlan?
Answer: Each VxLAN switch has a VTEP interface. In the Nexus family, this is a virtual interface called an NVE interface. The NVE gets a /32 IP address from a loopback interface, which is advertised into the IGP. The NVE has one or more VNI's bound to it. This is how the VTEP gets access to the LAN segments in the overlay.