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Configuring Fallback Bridging
Changing the Maximum-Idle Interval
If a switch does not receive 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). This procedure is optional.
Command
Step 1
configure terminal
Step 2
bridge bridge-group max-age seconds
Step 3
end
Step 4
show running-config
Step 5
copy running-config startup-config
To return to the default setting, use the no bridge bridge-group max-age global configuration command.
This example shows how to change the maximum-idle interval to 30 seconds in bridge group 10:
Switch(config)# bridge 10 max-age 30
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 a port. This
procedure is optional.
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
bridge-group bridge-group
spanning-disabled
Step 4
end
Step 5
show running-config
Step 6
copy running-config startup-config
To re-enable spanning tree on the port, use the no bridge-group bridge-group spanning-disabled
interface configuration command.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
47-10
Purpose
Enter global configuration mode.
Specify the interval that 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 6 to 200. The default is 30.
Return to privileged EXEC mode.
Verify your entry.
(Optional) Save your entry in the configuration file.
Purpose
Enter global configuration mode.
Specify the port, and enter interface configuration mode.
Disable spanning tree on the port.
For bridge-group, specify the bridge group number. The range is 1
to 255.
Return to privileged EXEC mode.
Verify your entry.
(Optional) Save your entry in the configuration file.
Chapter 47
Configuring Fallback Bridging
OL-13270-06
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