Cisco WS-C2950-24 Software Configuration Guide - Page 193
Changing the Address Aging Time
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Chapter 6 Configuring the System Managing the MAC Address Tables Changing the Address Aging Time Dynamic addresses are source MAC addresses that the switch learns and then drops when they are not in use. The aging time parameter defines how long the switch retains unseen addresses in the table. This parameter applies to all VLANs. Setting too short an aging time can cause addresses to be prematurely removed from the table. Then when the switch receives a packet for an unknown destination, it floods the packet to all ports in the same VLAN as the receiving port. This unnecessary flooding can impact performance. Setting too long an aging time can cause the address table to be filled with unused addresses; it can cause delays in establishing connectivity when a workstation is moved to a new port. Beginning in privileged EXEC mode, follow these steps to configure the dynamic address table aging time. Step 1 Step 2 Step 3 Step 4 Command configure terminal mac-address-table aging-time seconds end show mac-address-table aging-time Purpose Enter global configuration mode. Enter the number of seconds that dynamic addresses are to be retained in the address table. You can enter a number from 10 to 1000000. Return to privileged EXEC mode. Verify your entry. 78-6511-05 Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide 6-57