HP 5120 EI Series Lan Switching Configuration Manual page 110

[DeviceD] stp enable
Verify the configurations:
6.
In this example, suppose that Device B has the lowest root bridge ID. As a result, Device B is
elected as the root bridge in MSTI 0.
You can use the display stp brief command to display brief spanning tree information on each
device after the network is stable.
# Display brief spanning tree information on Device A.
[DeviceA] display stp brief
MSTID Port
0 GigabitEthernet1/0/1
0 GigabitEthernet1/0/2
0 GigabitEthernet1/0/3
1 GigabitEthernet1/0/1
1 GigabitEthernet1/0/3
3 GigabitEthernet1/0/2
3 GigabitEthernet1/0/3
# Display brief spanning tree information on Device B.
[DeviceB] display stp brief
MSTID Port
0 GigabitEthernet1/0/1
0 GigabitEthernet1/0/2
0 GigabitEthernet1/0/3
1 GigabitEthernet1/0/2
1 GigabitEthernet1/0/3
3 GigabitEthernet1/0/1
3 GigabitEthernet1/0/3
# Display brief spanning tree information on Device C.
[DeviceC] display stp brief
MSTID Port
0 GigabitEthernet1/0/1
0 GigabitEthernet1/0/2
0 GigabitEthernet1/0/3
1 GigabitEthernet1/0/1
1 GigabitEthernet1/0/2
4 GigabitEthernet1/0/3
# Display brief spanning tree information on Device D.
[DeviceD] display stp brief
MSTID Port
0 GigabitEthernet1/0/1
0 GigabitEthernet1/0/2
0 GigabitEthernet1/0/3
3 GigabitEthernet1/0/1
3 GigabitEthernet1/0/2
4 GigabitEthernet1/0/3
Based on the output, you can draw the MSTI mapped to each VLAN, as shown in
Role STP State
ALTE DISCARDING
DESI FORWARDING
ROOT FORWARDING
DESI FORWARDING
DESI FORWARDING
DESI FORWARDING
ROOT FORWARDING
Role STP State
DESI FORWARDING
DESI FORWARDING
DESI FORWARDING
DESI FORWARDING
ROOT FORWARDING
DESI FORWARDING
DESI FORWARDING
Role STP State
DESI FORWARDING
ROOT FORWARDING
DESI FORWARDING
ROOT FORWARDING
ALTE DISCARDING
DESI FORWARDING
Role STP State
ROOT FORWARDING
ALTE DISCARDING
ALTE DISCARDING
ROOT FORWARDING
ALTE DISCARDING
ROOT FORWARDING
101
Protection
NONE
NONE
NONE
NONE
NONE
NONE
NONE
Protection
NONE
NONE
NONE
NONE
NONE
NONE
NONE
Protection
NONE
NONE
NONE
NONE
NONE
NONE
Protection
NONE
NONE
NONE
NONE
NONE
NONE
Figure 29.