Spanning Tree Protocol DefinitionEnabling Spanning Tree ProtocolChanging the Spanning-Tree ModeConfiguring the Root SwitchConfiguring a Secondary Root SwitchConfiguring Port PriorityConfiguring the Path CostConfiguring the Switch Priority of a VLANConfiguring STP TimersConfiguring Optional Spanning-Tree FeaturesConfiguring and Verifying Port Error ConditionsEnabling Rapid Spanning TreeRapid Spanning Tree Link TypesEnabling Multiple Spanning TreeVerifying the Extended System IDVerifying STPTroubleshooting Spanning Tree ProtocolConfiguration Example: PVST+Spanning-Tree Migration Example: PVST+ to Rapid-PVST+