42-8
Catalyst 3750 Switch Software Configuration Guide
OL-8550-02
Chapter 42 Configuring Fallback Bridging
Configuring Fallback Bridging
To return to the default path cost, use the no bridge-group bridge-group path-cost interface
configuration command.
This example shows how to change the path cost to 20 on a port in bridge group 10:
Switch(config)# interface gigabitethernet2/0/1
Switch(config-if)# bridge-group 10 path-cost 20
Adjusting BPDU Intervals
You can adjust BPDU intervals as described in these sections:
• Adjusting the Interval between Hello BPDUs, page 42-8 (optional)
• Changing the Forward-Delay Interval, page 42-9 (optional)
• Changing the Maximum-Idle Interval, page 42-9 (optional)
Note Each switch in a spanning tree adopts the interval between hello BPDUs, the forward delay interval, and
the maximum idle interval parameters of the root switch, regardless of what its individual configuration
might be.
Adjusting the Interval between Hello BPDUs
Beginning in privileged EXEC mode, follow these step to adjust the interval between hello BPDUs. This
procedure is optional.
Step 3
bridge-group bridge-group path-cost
cost
Assign the path cost of a port.
• For bridge-group, specify the bridge group number. The range is 1
to 255.
• For cost, enter a number from 0 to 65535. The higher the value, the
higher the cost.
–
For 10 Mbps, the default path cost is 100.
–
For 100 Mbps, the default path cost is 19.
–
For 1000 Mbps, the default path cost is 4.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config Verify your entry.
Step 6
copy running-config startup-config (Optional) Save your entry in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
bridge bridge-group hello-time seconds Specify the interval between hello BPDUs.
• For bridge-group, specify the bridge group number. The range is 1
to 255.
• For seconds, enter a number from 1 to 10. The default is 2.
Step 3
end Return to privileged EXEC mode.
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