3com WX3000 Manuel D’Utilisation

 

1-47 

Implement MSTP in the network shown in 

 to enable packets of different VLANs to be 

forwarded along different spanning tree instances. The detailed configurations are as follows: 

z

 

All switches in the network belong to the same MST region. 

z

 

Packets of VLAN 10, VLAN 30, VLAN 40, and VLAN 20 are forwarded along spanning tree 
instance 1, instance 3, instance 4, and instance 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 spanning tree 
instance 1 and spanning tree instance 3 respectively. Switch C is configured as the root bridge of 
spanning tree instance 4. 

Network diagram for MSTP configuration 

 

 

The word “permit” shown in 

 means the corresponding link permits packets of specific 

VLANs. 

 

1)  Configure Switch A 

# Enter MST region view. 

<SwitchA> system-view 

[SwitchA] stp region-configuration 

# Configure the region name, VLAN-to-MSTI mapping table, and revision level for the MST region. 

[SwitchA-mst-region] region-name example 

[SwitchA-mst-region] instance 1 vlan 10 

[SwitchA-mst-region] instance 3 vlan 30 

[SwitchA-mst-region] instance 4 vlan 40 

[SwitchA-mst-region] revision-level 0 

# Activate the settings of the MST region manually. 

[SwitchA-mst-region] active region-configuration 

# Specify Switch A as the root bridge of spanning tree instance 1.