MSTP Configuration Example

Network requirements

Implement MSTP in the network shown in Figure 1-10 to enable packets of different VLANs to be forwarded along different spanning tree instances. The detailed configurations are as follows:

z

z

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 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.

Figure 1-10Network diagram for MSTP configuration

The word “permit” shown in Figure 1-10 means the corresponding link permits packets of specific VLANs.

Configuration procedure

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.

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3Com WX3000 operation manual Mstp Configuration Example, Configure Switch a # Enter MST region view