Allied Telesis AT-S88 - Manual (Page 147)

AT-S88 Management Software User’s Guide
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Dynamic MAC addresses are not stored indefinitely in the MAC address
table. The switch deletes a dynamic MAC address from the table if it does
not receive any frames from the node after a specified period of time. The
switch assumes that the node with that MAC address is no longer active
and that its MAC address can be purged from the table. This 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no longer active.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. You can adjust this value. The
default value is 300 seconds (5 minutes). For instructions on changing the
aging timer, refer to “Changing the Aging Time” on page 142.
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, after being entered in the table,
remains in the table indefinitely and is never deleted, even when the end
node is inactive. The maximum number of static MAC addresses is 1024.
You might need to enter static MAC addresses of end nodes the switch
does 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.