Milan Technology MIL-SM2401MAF - Manual (Page 90)

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Priority Configuration interface
MAC Address Configuration
When you add a static MAC address, it remains in the switch's address table, regardless
of whether the device is physically connected to the switch. This saves the switch from
having to re-learn a device's MAC address when the disconnected or powered-off device
is active on the network again. You can add / modify / delete a static MAC address.