CCNP SWITCH Portable Command Guide

Chapter 3. Implementing Spanning Tree

This chapter provides information and commands concerning the following topics:

• Enabling Spanning Tree Protocol

• Configuring the root switch

• Configuring a secondary root switch

• Configuring port priority

• Configuring the path cost

• Configuring the switch priority of a VLAN

• Configuring STP timers

• Verifying STP

• Optional STP configurations

— PortFast

— BPDU Guard

— BPDU Filtering

— UplinkFast

— BackboneFast

— Root Guard

— Loop Guard

— Unidirectional Link Detection

• Changing the spanning-tree mode

• Extended System ID

• Enabling Rapid Spanning Tree

• Enabling Multiple Spanning Tree

• Verifying MST

• Troubleshooting STP

Enabling Spanning Tree Protocol

Note

If more VLANs are defined in the ...