Mac Mobility - H3C S10500 Series Configuration Manual

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Figure 12 ARP flood suppression

ARP flood suppression uses the following workflow:

VM 1 sends an ARP request to obtain the MAC address of VM 7.

VTEP 1 creates a suppression entry for VM 1, and floods the ARP request in the VXLAN.

VTEP 2 and VTEP 3 de-encapsulate the ARP request. The VTEPs create a suppression entry

for VM 1, and broadcast the request in the local site.

VM 7 sends an ARP reply.

VTEP 2 creates a suppression entry for VM 7 and forwards the ARP reply to VTEP 1.

VTEP 1 de-encapsulates the ARP reply, creates a suppression entry for VM 7, and forwards the

ARP reply to VM 1.

VM 4 sends an ARP request to obtain the MAC address of VM 1 or VM 7.

VTEP 1 creates a suppression entry for VM 4 and replies to the ARP request.

VM 10 sends an ARP request to obtain the MAC address of VM 1.

10. VTEP 3 creates a suppression entry for VM 10 and replies to the ARP request.

MAC mobility

MAC mobility refers to that a VM or host moves from one ES to another. The source VTEP is

unaware of the MAC move event. To notify other VTEPs of the change, the destination VTEP

advertises a MAC/IP advertisement route for the MAC address. The source VTEP withdraws the old

route for the MAC address after receiving the new route. The MAC/IP advertisement route has a

sequence number that increases when the MAC address moves. The sequence number identifies

the most recent move if the MAC address moves multiple times.

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