Adjusting Spanning-Tree Parameters - Cisco WS-C3750-48PS-S Software Configuration Manual

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 gigabitethernet2/0/2
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 interface-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:
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Only network administrators with a good understanding of how switches and STP function should make
Note
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.
Catalyst 3750 Switch Software Configuration Guide
38-6
Changing the VLAN-Bridge Spanning-Tree Priority, page 38-7
Changing the Interface Priority, page 38-7
Assigning a Path Cost, page 38-8
Adjusting BPDU Intervals, page 38-9
Disabling the Spanning Tree on an Interface, page 38-11
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Chapter 38 Configuring Fallback Bridging
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