AT-S67 and AT-S68 User’s Guide
73
The type of MAC address described above is referred to as a dynamic
MAC address. Dynamic MAC addresses are addresses that the switch
learns by examining the source MAC addresses of the frames received
on the ports.
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 end-node over a specified period of
time. The switch assumes that the end-node with that MAC address is
not 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addresses of end-nodes that are no longer active.
The period of time that switch waits before purging an inactive dynamic
MAC address is called the “aging timer”. This value is adjustable on the
AT-FS7000 Series Switches. The default value is 300 seconds (5 minutes).
For instructions on changing the aging timer, refer to Changing the
MAC Aging Time on page 74.
