58
VLAN 10 and VLAN 30 are terminated on the distribution layer devices, and VLAN 40 is terminated
on the access layer devices. The root bridges of MSTI 1 and MSTI 3 are Device A and Device B,
respectively, and the root bridge of MSTI 4 is Device C.
Figure 22 Network diagram
Procedure
1. Configure VLANs and VLAN member ports. (Details not shown.)
{ Create VLAN 10, VLAN 20, and VLAN 30 on both Device A and Device B.
{ Create VLAN 10, VLAN 20, and VLAN 40 on Device C.
{ Create VLAN 20, VLAN 30, and VLAN 40 on Device D.
{ Configure the ports on these devices as trunk ports and assign them to related VLANs.
2. Configure Device A:
# Enter MST region view, and configure the MST region name as example.
<DeviceA> system-view
[DeviceA] stp region-configuration
[DeviceA-mst-region] region-name example
# Map VLAN 10, VLAN 30, and VLAN 40 to MSTI 1, MSTI 3, and MSTI 4, respectively.
[DeviceA-mst-region] instance 1 vlan 10
[DeviceA-mst-region] instance 3 vlan 30
[DeviceA-mst-region] instance 4 vlan 40
# Configure the revision level of the MST region as 0.
[DeviceA-mst-region] revision-level 0
# Activate MST region configuration.
[DeviceA-mst-region] active region-configuration
[DeviceA-mst-region] quit
# Configure the Device A as the root bridge of MSTI 1.
[DeviceA] stp instance 1 root primary
# Enable the spanning tree feature globally.
[DeviceA] stp global enable
3. Configure Device B:
# Enter MST region view, and configure the MST region name as example.
<DeviceB> system-view
Permit: all VLANs
P
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r
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t
:
V
L
A
N
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2
0
a
n
d
3
0
P
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:
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A
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1
0
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2
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Permit: VLANs 20 and 40
Permit: VLANs 20
and 30
Permit: VLANs 10
and 20
Device A Device B
Device C Device D
WGE1/0/3
W
G
E
1
/
0
/
2
WGE1/0/3
W
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1
/
0
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2
WGE1/0/3 WGE1/0/3
W
G
E
1
/
0
/
2
W
GE
1
/
0
/
2
MST region
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