How Reversed ARP is used for MAC learning with vSphere vMotion
When a virtual machine is migrated from one ESXi host to another the traffic for that vm has to be delivered to the destination host and no longer to the source host. How is the physical switch informed about the move? ESXi sends out a Reversed Address Resolution packet on the destination host that will trigger the physical switch to update its MAC-address table. In this article I will explain how this process works and why it is important.