2
Figure 1 VXLAN network model
VXLAN packet format
As shown in Figure 2, a VTEP encapsulates a frame in the following headers:
• 8-byte VXLAN header—VXLAN information for the frame.
{ Flags—If the I bit is 1, the VXLAN ID is valid. If the I bit is 0, the VXLAN ID is invalid. All
other bits are reserved and set to 0.
{ 24-bit VXLAN ID—Identifies the VXLAN of the frame. It is also called the virtual network
identifier (VNI).
• 8-byte outer UDP header for VXLAN—The default VXLAN destination UDP port number is
4789.
• 20-byte outer IP header—Valid addresses of VTEPs or VXLAN multicast groups on the
transport network. Devices in the transport network forward VXLAN packets based on the outer
IP header.
Figure 2 VXLAN packet format
Underlay network
Overlay network
VTEP 1
VTEP 2
Site 2
Site 1
VXLAN tunnel
Transport
network
P
Terminal
Terminal
VSI/VXLAN 10
VSI/VXLAN 20
VSI/VXLAN 10
VSI/VXLAN 20
Terminal
Terminal
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