R0106-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V7)

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VLAN ID Port Role STP State Protection
10 GigabitEthernet2/1/1 ROOT FORWARDING NONE
10 GigabitEthernet2/1/2 ALTE DISCARDING NONE
20 GigabitEthernet2/1/1 ROOT FORWARDING NONE
20 GigabitEthernet2/1/2 ALTE DISCARDING NONE
20 GigabitEthernet2/1/3 DESI FORWARDING NONE
40 GigabitEthernet2/1/3 DESI FORWARDING NONE
# Display brief spanning tree information on Device D.
[DeviceD] display stp brief
VLAN ID Port Role STP State Protection
20 GigabitEthernet2/1/1 ALTE DISCARDING NONE
20 GigabitEthernet2/1/2 ROOT FORWARDING NONE
20 GigabitEthernet2/1/3 ALTE DISCARDING NONE
30 GigabitEthernet2/1/1 ROOT FORWARDING NONE
30 GigabitEthernet2/1/2 ALTE DISCARDING NONE
40 GigabitEthernet2/1/3 ROOT FORWARDING NONE
Based on the output, you can draw a topology for each VLAN spanning tree, as shown in Figure 22.
Figure 22 VLAN spanning tree topologies