VxLAN Network Identifier - VNI

A VNI is considered to be either Layer-2 (tied to a MAC-VRF) or Layer-3 (tied to an IP-VRF), which indicates what kind of information is represented by the VRF. An IP-VRF represents a routing table (operating in much the same way as a VRF traditionally operates in L3VPN), while a MAC-VRF represents a bridging table i.e. MAC (fdb) and ARP/NDP entries.