33-5
Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 33 Configuring Fallback Bridging
Configuring Fallback Bridging
This example shows how to create bridge group 10 and to specify that the VLAN-bridge STP runs in the
bridge group. It defines a port as an SVI and assigns this port to VLAN 2 and to the bridge group:
Switch(config)# bridge 10 protocol vlan-bridge
Switch(config)# vlan 2
Switch(config-vlan)# exit
Switch(config)# interface vlan 2
Switch(config-if)# bridge-group 10
Switch(config-if)# no shutdown
Switch(config-if)# exit
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# switchport mode access
Switch(config-if)# switchport access vlan 2
Switch(config-if)# no shutdown
Adjusting Spanning-Tree Parameters
You might need to adjust certain spanning-tree parameters if the default values are not suitable. You
configure parameters affecting the entire spanning tree by using variations of the bridge global
configuration command. You configure port-specific parameters by using 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 VLAN-Bridge Spanning-Tree Priority, page 33-5 (optional)
• Changing the Interface Priority, page 33-6 (optional)
• Assigning a Path Cost, page 33-7 (optional)
• Adjusting BPDU Intervals, page 33-8 (optional)
• Disabling the Spanning Tree on an Interface, page 33-10 (optional)
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.
Changing the VLAN-Bridge Spanning-Tree Priority
You can globally configure the VLAN-bridge spanning-tree priority of a switch when it ties with another
switch for the position as the root switch. You also can configure the likelihood that the switch will be
selected as the root switch.
Beginning in privileged EXEC mode, follow these steps to change the switch priority. This procedure is
optional.
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