Example of Viewing the Extend System ID in a PVST+ ConfigurationDell(conf-pvst)#do show spanning-tree pvst vlan 5 briefVLAN 5Executing IEEE compatible Spanning Tree ProtocolRoot ID Priority 32773, Address 0001.e832.73f7Root Bridge hello time 2, max age 20, forward delay 15Bridge ID Priority 32773 (priority 32768 sys-id-ext 5), Address 0001.e832.73f7We are the root of Vlan 5Configured hello time 2, max age 20, forward delay 15PVST+ Sample ConfigurationsThe following examples provide the running configurations for the topology shown in the previousillustration.Example of PVST+ Configuration (R1)interface TenGigabitEthernet 1/22no ip addressswitchportno shutdown!interface TenGigabitEthernet 1/32no ip addressswitchportno shutdown!protocol spanning-tree pvstno disablevlan 100 bridge-priority 4096interface Vlan 100no ip addresstagged TenGigabitEthernet 1/22,32no shutdown!interface Vlan 200no ip addresstagged TenGigabitEthernet 1/22,32no shutdown!interface Vlan 300no ip addresstagged TenGigabitEthernet 1/22,32no shutdown!protocol spanning-tree pvstno disablevlan 100 bridge-priority 4096Example of PVST+ Configuration (R2)interface TenGigabitEthernet 2/12no ip addressswitchportno shutdown!interface TenGigabitEthernet 2/32no ip addressswitchportno shutdown!interface Vlan 100650 Per-VLAN Spanning Tree Plus (PVST+)
