No video você disse que é um bug no programa pois ele não muda a cor da porta. No caso, não seria porque não foi alterado como root para a vlan 1? Quando verifico o Spanning tree para a vlan 1 a porta Fa0/3 esta designada e para a vlan 10 e 20 esta bloqueada.
Switch#show spanning-tree
VLAN0001
Spanning tree enabled protocol ieee
Root ID Priority 32769
Address 0040.0B8A.EE42
Cost 19
Port 3(FastEthernet0/3)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32769 (priority 32768 sys-id-ext 1)
Address 00E0.A3EA.E148
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/3 Root FWD 19 128.3 P2p
Fa0/5 Desg FWD 19 128.5 P2p
VLAN0010
Spanning tree enabled protocol ieee
Root ID Priority 10
Address 00E0.F723.A7D2
Cost 19
Port 5(FastEthernet0/5)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32778 (priority 32768 sys-id-ext 10)
Address 00E0.A3EA.E148
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/2 Desg FWD 19 128.2 P2p
Fa0/3 Altn BLK 19 128.3 P2p
Fa0/5 Root FWD 19 128.5 P2p
VLAN0020
Spanning tree enabled protocol ieee
Root ID Priority 20
Address 00E0.F723.A7D2
Cost 19
Port 5(FastEthernet0/5)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 32788 (priority 32768 sys-id-ext 20)
Address 00E0.A3EA.E148
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/3 Altn BLK 19 128.3 P2p
Fa0/4 Desg FWD 19 128.4 P2p
Fa0/5 Root FWD 19 128.5 P2p
Switch#