Refer to the exhibit.
How is the ARP request from VM1 forwarded when VM2 is not learned in the Cisco ACI fabric?
Leaf 101 forwards the ARP request to one of the proxy VTEP spines.
POD1 spine responds to the ARP request after the POD1 COOP is updated with the VM2 location.
Leaf 101 encapsulates the ARP request into a multicast packet that is destined to 225.0.37.192.
Leaf 101 switch consumers the ARP reply of VM2 to update the local endpoint table.
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