HP 5120 EI Series User Manual

101
[DeviceD] stp enable
6. Verify the configurations:
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 Role STP State Protection
0 GigabitEthernet1/0/1 ALTE DISCARDING NONE
0 GigabitEthernet1/0/2 DESI FORWARDING NONE
0 GigabitEthernet1/0/3 ROOT FORWARDING NONE
1 GigabitEthernet1/0/1 DESI FORWARDING NONE
1 GigabitEthernet1/0/3 DESI FORWARDING NONE
3 GigabitEthernet1/0/2 DESI FORWARDING NONE
3 GigabitEthernet1/0/3 ROOT FORWARDING NONE
# Display brief spanning tree information on Device B.
[DeviceB] display stp brief
MSTID Port Role STP State Protection
0 GigabitEthernet1/0/1 DESI FORWARDING NONE
0 GigabitEthernet1/0/2 DESI FORWARDING NONE
0 GigabitEthernet1/0/3 DESI FORWARDING NONE
1 GigabitEthernet1/0/2 DESI FORWARDING NONE
1 GigabitEthernet1/0/3 ROOT FORWARDING NONE
3 GigabitEthernet1/0/1 DESI FORWARDING NONE
3 GigabitEthernet1/0/3 DESI FORWARDING NONE
# Display brief spanning tree information on Device C.
[DeviceC] display stp brief
MSTID Port Role STP State Protection
0 GigabitEthernet1/0/1 DESI FORWARDING NONE
0 GigabitEthernet1/0/2 ROOT FORWARDING NONE
0 GigabitEthernet1/0/3 DESI FORWARDING NONE
1 GigabitEthernet1/0/1 ROOT FORWARDING NONE
1 GigabitEthernet1/0/2 ALTE DISCARDING NONE
4 GigabitEthernet1/0/3 DESI FORWARDING NONE
# Display brief spanning tree information on Device D.
[DeviceD] display stp brief
MSTID Port Role STP State Protection
0 GigabitEthernet1/0/1 ROOT FORWARDING NONE
0 GigabitEthernet1/0/2 ALTE DISCARDING NONE
0 GigabitEthernet1/0/3 ALTE DISCARDING NONE
3 GigabitEthernet1/0/1 ROOT FORWARDING NONE
3 GigabitEthernet1/0/2 ALTE DISCARDING NONE
4 GigabitEthernet1/0/3 ROOT FORWARDING NONE
Based on the output, you can draw the MSTI mapped to each VLAN, as shown in Figure 29.

HP 5120 EI Series Specifications

General

Brand	HP
Model	5120 EI Series
Category	Switch
Language	English