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No momento em que se realiza cada um destes comandos, define-se a prioridade nos switches:

Switch_A(config)# spanning-tree vlan 1 priority 0
Switch_B(config)# spanning-tree vlan 1 priority 4096
Switch_C(config)# spanning-tree vlan 1 priority 8192

Observe os relatórios a seguir:


                SWITCH_A#SHOW SPANNING-TREE

                VLAN0001

                Spanning tree enabled protocol ieee

                Root ID Priority 1

                Address 0003.E4C3.6DB3

                This bridge is the root

                Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

                Bridge ID Priority 1 (priority 0 sys-id-ext 1)

                Address 0003.E4C3.6DB3

                Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec

                Aging Time 20

                Interface Role Sts Cost Prio.Nbr Type

                --------------------------------------------------------------------

                Fa1/1 Desg FWD 19 128.2 P2p

                Fa0/1 Desg FWD 19 128.1 P2p

                SWITCH_A#

O SwitchA acabou tornando-se o switch raiz desta rede.