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Configuring MAC Address Table Aging Time Managing Source Learning

page 2-6 OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006

Configuring MAC Address Table Aging Time

Source learning also tracks MAC address age and removes addresses from the MAC address table that

have aged beyond the aging timer value. When a device stops sending packets, source learning keeps track

of how much time has passed since the last packet was received on the device’s switch port. When this

amount of time exceeds the aging time value, the MAC is aged out of the MAC address table. Source

learning always starts tracking MAC address age from the time since the last packet was received.

By default, the aging time is set to 300 seconds (5 minutes) and is configured on a global basis using the

mac-address-table aging-time command. For example, the following sets the aging time for all VLANs

to 1200 seconds (20 minutes):

-> mac-address-table aging-time 1200

A MAC address learned on any VLAN port will age out if the time since a packet with that address was

last seen on the port exceeds 1200 seconds.

Note. Note that the aging time used is twice the length in time of the actual value specified. For example,

if an aging time of 60 seconds is specified, the MAC will age out after 120 seconds of inactivity.

When using the mac-address-table aging-time command in a switch configuration file (e.g., boot.cfg),

include an instance of this command specifying the VLAN ID for each VLAN configured on the switch.

This is necessary even though if

all VLANs will have the same aging time value.

To set the aging time back to the default value, use the no form of the mac-address-table aging-time

command. For example, the following sets the aging time for all VLANs back to the default of 300

seconds:

-> no mac-address-table aging-time

Note. The MAC address table aging time is also used as the timeout value for the Address Resolution

Protocol (ARP) table. This timeout value determines how long the switch retains dynamically learned

ARP table entries. See Chapter 12, “Configuring IP,” for more information.

To display the aging time value for one or all VLANs, use the show mac-address-table aging-time

command. For more information about this command, see the OmniSwitch CLI Reference Guide.

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