Cisco Systems 3750E manual Adjusting Spanning-Tree Parameters, 44-6

Chapter 44 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 an SVI for VLAN 2 and assigns it to the bridge group:

Switch(config)# bridge 10 protocol vlan-bridge

Switch(config)# vlan 2

Switch(config-vlan)# exit

Switch(config)# interface vlan2

Switch(config-if)# bridge-group 10

Switch(config-if)# exit

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-groupinterface configuration command.

You can adjust spanning-tree parameters by performing any of the tasks in these sections:

•Changing the VLAN-BridgeSpanning-Tree Priority, page 44-7(optional)

•Changing the Interface Priority, page 44-7(optional)

•Assigning a Path Cost, page 44-8(optional)

•Adjusting BPDU Intervals, page 44-9(optional)

•Disabling the Spanning Tree on an Interface, page 44-11(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, see the “References and Recommended Reading” appendix in the Cisco IOS Configuration Fundamentals Command Reference.

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

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