This read-write INTEGER identifies the switch port through which a given address table entry's device is connected, though it's only meaningful for entry-dynamic-local, entry-statistics, or entry-port type entries. An admin uses this to know or specify exactly which physical port a particular MAC address is, or should be, reachable through, which matters both for troubleshooting where a device is plugged in and for creating static port bindings. For example, to locate which port a suspicious MAC address is connected through, the admin would look up its address table entry and read kxaddrPort to identify the physical port to investigate.