Cisco HWIC-4ESW - Page 87

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
87
Book Title
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.
Follow the steps below to disable spanning tree on an interface.
SUMMARY STEPS
1. enable
2. configure terminal
3. interface interface-id
4. bridge-group bridge-group spanning-disabled
5. end
6. show running-config
7. copy running-config startup-config
DETAILED STEPS
Command Purpose
Step 1
enable
Example:
Router> enable
Enables privileged EXEC mode.
• Enter your password if prompted.
Step 2
configure terminal
Example:
Router# configure terminal
Enters global configuration mode.
Step 3
interface interface-id
Example:
Router(config)# interface 0/3/1
Enters interface configuration mode and specifies the interface to set
the priority.
Step 4
bridge-group bridge-group
spanning-disabled
Example:
Router(config-if)# bridge 100
spanning-disabled
Disables spanning tree on the interface.
• For bridge-group, specify the bridge group number. The range is 1
to 255.
Step 5
end
Example:
Router(config-if)# end
Returns to privileged EXEC mode.