3com 5500-SI Manual Do Utilizador

C

HAPTER

 13: MSTP C

ONFIGURATION

After completing the above configurations, you can display MSTP operation and 
verify your configuration by executing the display command in any view.

You can also clear MSTP-related statistics by executing the reset command in user 
view or debug the MSTP module by executing the debugging command in user 
view.

Perform MSTP configuration in the network shown in Figure 45 to enable packets of 
different VLANs to be forwarded along different spanning tree instances. The detailed 
requirements are as follows:

■

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

■

Packets of VLAN 10 are forwarded along spanning tree instance 1; those of VLAN 
30 are forwarded along spanning tree instance 3; those of VLAN 40 are forwarded 
along spanning tree instance 4; and those of VLAN 20 are forwarded along 
spanning tree instance 0.

In this network, Switch A and Switch B operate at the distribution layer, Switch C and 
Switch D operate at the access layer. VLAN 10 and VLAN 30 are limited in the 
distribution layer and VLAN 40 is limited in the access layer. Switch A and Switch B are 
the root bridges of spanning tree instance 1 and spanning tree instance 3 respectively. 
Switch C is  the root bridge of spanning tree instance 4.

Figure 45   Network diagram for MSTP configuration

The Permit: shown in Figure 45, means the corresponding link permits packets of 
specific VLANs.

Table 174   Display and debug MSTP

Display the spanning tree status information 
and statistics about the current switch

display stp [ instance instance-id ] [ 
interface interface-list | slot slot-number ] [ 
brief ]

Display region configuration

display stp region-configuration

Clear MSTP-related statistics 

reset stp [ interface interface-list ]