3Com Switch 4500 Family Manual page 189

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If the aging timer is set too long, MAC address entries may still exist even if they turn invalid. This

causes the switch to be unable to update its MAC address table in time. In this case, the MAC

address table cannot reflect the position changes of network devices in time.

# Set the aging time of MAC address entries to 500 seconds.

<Sysname> system-view

System View: return to User View with Ctrl+Z.

[Sysname] mac-address timer aging 500

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4500 26-port 4500 50-port 4500 pwr 26-port