Allied Telesis AT-S21 - Manual (Page 65)

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Menu: MAC Address Table
Figure 4-8 MAC Address Menu
The MAC address table (also referred to as the forwarding table) is a
snapshot of source MAC addresses that the switch has learned and
stored in its volatile memory. The switch can store up to 16K
addresses. The information on the table dynamically changes as
packets bearing source addresses appear on any port.
The table flows into a second page as more addresses are detected
by all ports.
The table ages out MAC addresses after 300 seconds (5 minutes) as a
default. This means if a MAC address listed on the table does not
reappear on any port within the aging time, that address is deleted. If
you reset the switch or remove power, the table clears but
immediately gets updated as soon as the switch is operational and
the ports start to detect MAC addresses in incoming packets.
Static MAC addresses are not affected by aging time, loss of power, or
switch resets. This topic is described later in this section.