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Components of VXLAN Frame Format
Some of the important fields of the VXLAN frame format are described below:
Outer Ethernet
Header:
The Outer Ethernet Header consists of the following components:
• Destination Address: Generally, it is a first hop router's MAC address when the
VTEP is on a different address.
• Source Address : It is the source MAC address of the router that routes the
packet.
• VLAN: It is optional in a VXLAN implementation and will be designated by an
ethertype of 0×8100 and has an associated VLAN ID tag.
• Ethertype: It is set to 0×0800 because the payload packet is an IPv4 packet.
The initial VXLAN draft does not include an IPv6 implementation, but it is
planned for the next draft.
Outer IP
Header:
The Outer IP Header consists of the following components:
• Protocol: It is set to 0×11 to indicate that the frame contains a UDP packet .
• Source IP: It is the IP address of originating VTEP.
• Destination IP: : It is the IP address of target VTEP.
Outer UDP
Header:
The Outer UDP Header consists of the following components:
• Source Port: Entropy of the inner frame. The entropy could be based on the
Inner L2 header or Inner L3 header.
• VXLAN Port : IANA-assigned VXLAN Port (4789).
• UDP Checksum: The UDP checksum field is transmitted as zero. When a packet
is received with a UDP checksum of zero, it is accepted for decapsulation.
VXLAN
Header :
• VXLAN Flags : Reserved bits set to zero except bit 3, the first bit, which is set to
1 for a valid VNI
1000
Virtual Extensible LAN (VXLAN)