Normally, when a packet that is received by a port has an unknown destination MAC address, the packet is dropped. MAC learning also supports unknown unicast flooding. The field MAC Learning Aging Time displays the pre-defined value, which is 600. If a MAC address that is learned is not used for a certain period of time, it gets removed. With MAC learning, the vSwitch inspects the source MAC address of every packet coming from the vNIC, learns the MAC address and allows the packet to proceed. VMs running inside the ESXi VM do not have network connectivity because their packets have different source MAC addresses. Without MAC learning, when the vNIC of the ESXi VM connects to a segment port, its MAC address is static. MAC learning provides network connectivity to deployments where multiple MAC addresses get configured behind one vNIC, for example, in a nested hypervisor deployment where an ESXi VM runs on an ESXi host and multiple VMs run inside the ESXi VM. In the default MAC discovery segment profile, this property is enabled. This feature is supported on ESXi only and not on KVM. A VM connected to a port can run an administrative command to change the MAC address of its vNIC and still send and receive traffic on that vNIC. The MAC address change feature allows a VM to change its MAC address. The MAC discovery segment profile supports two functionalities: MAC learning and MAC address change.
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