1
GigabitEthernet4/1/3
3
GigabitEthernet4/1/2
3
GigabitEthernet4/1/3
# Display brief spanning tree information on Router B.
[RouterB] display stp brief
MSTID
Port
0
GigabitEthernet4/1/1
0
GigabitEthernet4/1/2
0
GigabitEthernet4/1/3
1
GigabitEthernet4/1/2
1
GigabitEthernet4/1/3
3
GigabitEthernet4/1/1
3
GigabitEthernet4/1/3
# Display brief spanning tree information on Router C.
[RouterC] display stp brief
MSTID
Port
0
GigabitEthernet4/1/1
0
GigabitEthernet4/1/2
0
GigabitEthernet4/1/3
1
GigabitEthernet4/1/1
1
GigabitEthernet4/1/2
4
GigabitEthernet4/1/3
# Display brief spanning tree information on Router D.
[RouterD] display stp brief
MSTID
Port
0
GigabitEthernet4/1/1
0
GigabitEthernet4/1/2
0
GigabitEthernet4/1/3
3
GigabitEthernet4/1/1
3
GigabitEthernet4/1/2
4
GigabitEthernet4/1/3
Based on the above information, draw the MSTI mapped to each VLAN, as shown in
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
79
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
24.