Virtual eXtensible LAN (VXLAN)

VXLAN is a network encapsulation technique to extend VLAN over layer 3 network. It encapsulates an original layer 2 Ethernet frame within an UDP packet (over UDP port 4789, by default).

           +----------+-------------+--------+----------+--------------------------+-----+
           | Ethernet |      IP     |  UDP   |  VXLAN   |         Original         | FCS |
           |  Header  |    Header   | Header |  Header  |      Ethernet Frame      |     |
           +----------+-------------+--------+----------+--------------------------+-----+
Bytes           14          20           8        24                                  4
About          VTEP        VTEP        4798       VNI          Original VLAN

           +-----------+-----------+-----------+-----------+
           |VXLAN Flag | Reserved  |    VNI    | Reserved  |
           +-----------+-----------+-----------+-----------+
Bits             8          24          24           8