HP 5120 EI Series

104
# Display brief spanning tree information on Device A.
[DeviceA] display stp brief
VLAN Port Role STP State Protection
10 GigabitEthernet1/0/1 DESI DISCARDING NONE
10 GigabitEthernet1/0/3 DESI FORWARDING NONE
20 GigabitEthernet1/0/1 DESI FORWARDING NONE
20 GigabitEthernet1/0/2 DESI FORWARDING NONE
20 GigabitEthernet1/0/3 DESI FORWARDING NONE
30 GigabitEthernet1/0/2 DESI FORWARDING NONE
30 GigabitEthernet1/0/3 ROOT FORWARDING NONE
# Display brief spanning tree information on Device B.
[DeviceB] display stp brief
VLAN Port Role STP State Protection
10 GigabitEthernet1/0/2 DESI FORWARDING NONE
10 GigabitEthernet1/0/3 ROOT FORWARDING NONE
20 GigabitEthernet1/0/1 DESI FORWARDING NONE
20 GigabitEthernet1/0/2 DESI FORWARDING NONE
20 GigabitEthernet1/0/3 ROOT FORWARDING NONE
30 GigabitEthernet1/0/1 DESI FORWARDING NONE
30 GigabitEthernet1/0/3 DESI FORWARDING NONE
# Display brief spanning tree information on Device C.
[DeviceC] display stp brief
VLAN Port Role STP State Protection
10 GigabitEthernet1/0/1 ROOT FORWARDING NONE
10 GigabitEthernet1/0/2 ALTE FORWARDING NONE
20 GigabitEthernet1/0/1 ROOT FORWARDING NONE
20 GigabitEthernet1/0/2 ALTE FORWARDING NONE
20 GigabitEthernet1/0/3 DESI DISCARDING NONE
40 GigabitEthernet1/0/3 DESI FORWARDING NONE
# Display brief spanning tree information on Device D.
[DeviceD] display stp brief
VLAN Port Role STP State Protection
20 GigabitEthernet1/0/1 ALTE FORWARDING NONE
20 GigabitEthernet1/0/2 ROOT DISCARDING NONE
20 GigabitEthernet1/0/3 ALTE DISCARDING NONE
30 GigabitEthernet1/0/1 ROOT FORWARDING NONE
30 GigabitEthernet1/0/2 ALTE DISCARDING NONE
40 GigabitEthernet1/0/3 ROOT FORWARDING NONE
Based on the output, you can draw the spanning tree mapped to each VLAN, as shown in Figure
31.