This event records a MAC address conflict for a virtual machine.
The MAC address of the VM conflicts with MAC assigned to another VM.
Note that this event has been observed during failover of FT (Fault-Tolerant) virtual machines.
If this occurs during FT VM failover, then no action may be required. In other cases, check configuration and status of VM and vCenter.
Refer to this VMware KB article for more information.
Refer to the VMware Online Documentation for more information.