Allied Telesis AT-S62 - Manual (Page 110)

Chapter 7: MAC Address Table
Section I: Basic Operations 110
prevents the MAC address table from becoming filled with addresses of
nodes that are no longer active.
The period of time that the switch waits before purging an inactive
dynamic MAC address is called the aging time. This value is adjustable on
the AT-8500 Series switch. The default value is 300 seconds (5 minutes).
For instructions on changing the aging timer, refer to Changing the
Aging Time on page 119.
The MAC address table can also store static MAC addresses. A static MAC
address is a MAC address of an end node that you assign to a switch port
manually. A static MAC address, once entered in the table, remains in the
table indefinitely and is never deleted, even when the end node is
inactive.
You might need to enter static MAC addresses of end nodes the switch
might not learn in its normal dynamic learning process, or if you want a
MAC address to remain permanently in the table, even when the end
node is inactive.