R3102-R3103-HP 6600/HSR6600 Routers Layer 2 - LAN Switching Configuration Guide

80
0 GigabitEthernet4/0/2 ROOT FORWARDING NONE
0 GigabitEthernet4/0/3 DESI FORWARDING NONE
1 GigabitEthernet4/0/1 ROOT FORWARDING NONE
1 GigabitEthernet4/0/2 ALTE DISCARDING NONE
4 GigabitEthernet4/0/3 DESI FORWARDING NONE
# Display brief spanning tree information on Router D.
[RouterD] display stp brief
MSTID Port Role STP State Protection
0 GigabitEthernet4/0/1 ROOT FORWARDING NONE
0 GigabitEthernet4/0/2 ALTE DISCARDING NONE
0 GigabitEthernet4/0/3 ALTE DISCARDING NONE
3 GigabitEthernet4/0/1 ROOT FORWARDING NONE
3 GigabitEthernet4/0/2 ALTE DISCARDING NONE
4 GigabitEthernet4/0/3 ROOT FORWARDING NONE
Based on the output, you can draw the MSTI mapped to each VLAN, as shown in Figure 24.
Figure 24 MSTIs mapped to different VLANs
A
B
A B
C D
C
B
C
MSTI 1 mapped to VLAN 10
A
D D
Root bridge Normal link Blocked link
MSTI 3 mapped to VLAN 30
MSTI 0 mapped to VLAN 20
MSTI 4 mapped to VLAN 40