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R2511-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V5)

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MSTID Port Role STP State Protection
0 Ethernet1/1 DESI FORWARDING NONE
0 Ethernet1/2 DESI FORWARDING NONE
0 Ethernet1/3 DESI FORWARDING NONE
1 Ethernet1/2 DESI FORWARDING NONE
1 Ethernet1/3 ROOT FORWARDING NONE
3 Ethernet1/1 DESI FORWARDING NONE
3 Ethernet1/3 DESI FORWARDING NONE
# Display brief spanning tree information on Router C.
[RouterC] display stp brief
MSTID Port Role STP State Protection
0 Ethernet1/1 DESI FORWARDING NONE
0 Ethernet1/2 ROOT FORWARDING NONE
0 Ethernet1/3 DESI FORWARDING NONE
1 Ethernet1/1 ROOT FORWARDING NONE
1 Ethernet1/2 ALTE DISCARDING NONE
4 Ethernet1/3 DESI FORWARDING NONE
# Display brief spanning tree information on Router D.
[RouterD] display stp brief
MSTID Port Role STP State Protection
0 Ethernet1/1 ROOT FORWARDING NONE
0 Ethernet1/2 ALTE DISCARDING NONE
0 Ethernet1/3 ALTE DISCARDING NONE
3 Ethernet1/1 ROOT FORWARDING NONE
3 Ethernet1/2 ALTE DISCARDING NONE
4 Ethernet1/3 ROOT FORWARDING NONE
Based on the output, you can draw the MSTI mapped to each VLAN, as shown in Figure 23.
Figure 23 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