Installation guide

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
58
Cisco IOS Release 12.3(8)T4
OL-6454-01
To return to the default setting, use the no bridge bridge-group forward-time seconds global
configuration command.
Changing the Maximum-Idle Interval
If a switch does not hear BPDUs from the root switch within a specified interval, it recomputes the
spanning-tree topology.
Beginning in privileged EXEC mode, follow these steps to change the maximum-idle interval (maximum
aging time).
SUMMARY STEPS
1. configure terminal
2. bridge bridge-group max-age seconds
3. end
4. show running-config
5. copy running-config startup-config
DETAILED STEPS
To return to the default setting, use the no bridge bridge-group max-age global configuration command.
Disabling the Spanning Tree on an Interface
When a loop-free path exists between any two switched subnetworks, you can prevent BPDUs generated
in one switching subnetwork from impacting devices in the other switching subnetwork, yet still permit
switching throughout the network as a whole. For example, when switched LAN subnetworks are
separated by a WAN, BPDUs can be prevented from traveling across the WAN link.
Beginning in privileged EXEC mode, follow these steps to disable spanning tree on an interface.
SUMMARY STEPS
1. configure terminal
2. interface interface-id
Command Purpose
Step 1
configure terminal
Enters global configuration mode.
Step 2
bridge bridge-group max-age seconds
Specifies the interval the switch waits to hear BPDUs from the root
switch.
• For bridge-group, specify the bridge group number. The range is 1
to 255.
• For seconds, enter a number from 10 to 200. The default is 30
seconds.
Step 3
end
Returns to privileged EXEC mode.
Step 4
show running-config
Verifies your entry.
Step 5
copy running-config startup-config
(Optional) Saves your entry in the configuration file.