The broadcast domain BD of VXLAN.

(an explanation of VXLAN's BD. (extracted from Huawei kelp)

BD (Bridge Domain) 0 is a layer 2 broadcast domain that forwards data packets in VXLAN networks.

In VXLAN network, mapping VNI to broadcast domain BD,BD at 1:1 becomes the entity that forwards data packets in VXLAN network.

VBDIF interface, based on the three-layer logical interface created by BD. The configuration of IP address through VBDIF interface can realize the communication between VXLAN of different network segments, and between VXLAN and non-VXLAN, as well as layer 2 network access to layer 3 network.

When manually configuring VXLAN tunnels and VXLAN access points, BD is bound to vni.

The screenshot above shows that vni supports up to 16m.

With regard to the value of BD, the current practice is that each network segment corresponds to a BD value.

For example, when there are two network segments under a certain leaf, you need to create two BD to bind separately.

The same IP address range vni under different leaf needs to be the same.