Specifications

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
How to Configure EtherSwitch HWICs
79
To disable the frame forwarding ability, use the no bridge bridge-group address mac-address global
configuration command.
Adjusting Spanning-Tree Parameters
You might need to adjust certain spanning-tree parameters if the default values are not suitable for your
switch configuration. Parameters affecting the entire spanning tree are configured with variations of the
bridge global configuration command. Interface-specific parameters are configured with variations of
the bridge-group interface configuration command.
You can adjust spanning-tree parameters by performing any of the tasks in these sections:
• Changing the Switch Priority, page 79
• Changing the Interface Priority, page 81
• Assigning a Path Cost, page 82
• Adjusting BPDU Intervals, page 83
• Adjusting the Interval Between Hello BPDUs, page 83
• Changing the Forward-Delay Interval, page 84
• Changing the Maximum-Idle Interval, page 86
• Disabling the Spanning Tree on an Interface, page 87
Note Only network administrators with a good understanding of how switches and STP function should make
adjustments to spanning-tree parameters. Poorly planned adjustments can have a negative impact on
performance. A good source on switching is the IEEE 802.1d specification; for more information, refer
to the “References and Recommended Reading” appendix in the Cisco IOS Configuration Fundamentals
Command Reference, Release 12.2.
Changing the Switch Priority
You can globally configure the priority of an individual switch when two switches tie for position as the
root switch, or you can configure the likelihood that a switch will be selected as the root switch. This
priority is determined by default; however, you can change it.
Follow the steps below to change the switch priority.
Step 3
show running-config
Example:
Router: show running-config
Verifies your entry.
Step 4
copy running-config startup-config
Example:
Router# copy running-config
startup-config
(Optional) Saves your entry in the configuration file.
Command Purpose