Chapter 13. Spanning Tree Protocol and EtherChannel

This chapter provides information and commands concerning the following topics:

• Spanning-tree verification and troubleshooting

• Change spanning-tree priority of a switch (version 12.0 and 12.1 of IOS)

• Changing the cost of spanning tree on an interface

• Changing the state of spanning tree on an interface

• Spanning Tree Portfast BPDU Guard

• EtherChannel configuration

• Verification of EtherChannel

• EtherChannel tips