Configuring The Bridge Table Aging Time - Cisco HWIC-4ESW User Manual

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards

Configuring the Bridge Table Aging Time

A switch forwards, floods, or drops packets based on the bridge table. The bridge table maintains both
static and dynamic entries. Static entries are entered by you. Dynamic entries are entered by the bridge
learning process. A dynamic entry is automatically removed after a specified length of time, known as
aging time, from the time the entry was created or last updated.
If you are likely to move hosts on a switched network, decrease the aging time to enable the switch to
quickly adapt to the change. If hosts on a switched network do not continuously send packets, increase
the aging time to keep the dynamic entries for a longer time and thus reduce the possibility of flooding
when the hosts send again.
Follow the steps below to configure the aging time.
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
DETAILED STEPS
Command
Step 1
enable
Example:
Router> enable
Step 2
configure terminal
Example:
Router# configure terminal
Step 3
bridge bridge-group aging-time
seconds
Example:
Router(config)# bridge 100
aging-time 10000
Step 4
end
Example:
Router(config)# end
enable
configure terminal
bridge bridge-group aging-time seconds
end
show running-config
copy running-config startup-config
Purpose
Enables privileged EXEC mode.
Enter your password if prompted.
•
Enters global configuration mode.
Specifies the length of time that a dynamic entry remains in the bridge
table from the time the entry was created or last updated.
For bridge-group, specify the bridge group number. The range is 1
•
to 255.
For seconds, enter a number from 0 to 1000000. The default is 300
•
seconds.
Returns to privileged EXEC mode.
How to Configure EtherSwitch HWICs
Book Title
77