Start of MAC: 00:50:56 VNIC Types: Flexible / E1000
When a VM guest is migrated between VM host A to B, we observe a number of reverse ARP / gratuitous ARP packets being submitted by the VM host A and VM host B.
When running the debug arp on the Cisco 2960 we observe the following, so know that the switch is receiving the reverse ARP / gratuitous ARP requests.
RARP: Rcvd RARP req for <VNIC 1 MAC ADDRESS>
RARP: Rcvd RARP req for <VNIC 2 MAC ADDRESS>
When reviewing the MAC address table we can see that interface Gi1/0/3 has the MAC address of VNIC 1 associated with it, but the MAC address of VNIC 2 doesnt appear to have been registered within the CAM cable. This then prompts a unicast flood to take place for traffic destined to this interface. The MAC address for VNIC 2 never seems to appear even when checking hours later.
Just wondered if anyone else has experienced a similar issue
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