What is VNI-VXLAN Network Identifier?
VNI stands for VXLAN Network Identifier. It’s like a VLAN ID — but for VXLAN. VLAN ID is used in traditional Ethernet networks to isolate traffic (max 4096). VNI is used in VXLAN networks to segment and isolate traffic — just like VLANs — but supports up to 16 million segments! It is typically a 24-bit value part of the VXLAN header, valid VNI values are from 4096 to 16,777,215.
https://packetroute.com/data-centre-technology/vxlan/what-is-vni-vxlan-network-identifier/

