3Com 4200G 12-Port Configuration Manual page 211

All switches in the network belong to the same MST region.
Packets of VLAN 10, VLAN 30, VLAN 40, and VLAN 20 are forwarded along MSTI 1, MSTI 3, MSTI
4, and MSTI 0 respectively.
In this network, Switch A and Switch B operate on the convergence layer; Switch C and Switch D
operate on the access layer. VLAN 10 and VLAN 30 are limited in the convergence layer and VLAN 40
is limited in the access layer. Switch A and Switch B are configured as the root bridges of MSTI 1 and
MSTI 3 respectively. Switch C is configured as the root bridge of MSTI 4.
Network diagram
Figure 1-9 Network diagram for MSTP configuration
The word "permit" shown in
VLANs.
Configuration procedure
1) Configure Switch A
# Enter MST region view.
<Sysname> system-view
[Sysname] stp region-configuration
# Configure the region name, VLAN-to-MSTI mapping table, and revision level for the MST region.
[Sysname-mst-region] region-name example
[Sysname-mst-region] instance 1 vlan 10
[Sysname-mst-region] instance 3 vlan 30
[Sysname-mst-region] instance 4 vlan 40
[Sysname-mst-region] revision-level 0
# Activate the settings of the MST region manually.
[Sysname-mst-region] active region-configuration
# Specify Switch A as the root bridge of MSTI 1.
[Sysname] stp instance 1 root primary
2) Configure Switch B
# Enter MST region view.
<Sysname> system-view
Figure 1-9 means the corresponding link permits packets of specific
1-44