Planet XGS3-24042 User Manual download pdf (Page 161)

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Switch3(Config-Vlan30)#exit

Switch3(config)#vlan 40

Switch3(Config-Vlan40)#exit

Switch3(config)#vlan 50

Switch3(Config-Vlan50)#exit

Switch3(config)#spanning-tree mst configuration

Switch3(Config-Mstp-Region)#name mstp

Switch3(Config-Mstp-Region)#instance 3 vlan 20;30

Switch3(Config-Mstp-Region)#instance 4 vlan 40;50

Switch3(Config-Mstp-Region)#exit

Switch3(config)#interface e1/0/1-7

Switch3(Config-Port-Range)#switchport mode trunk

Switch3(Config-Port-Range)#exit

Switch3(config)#spanning-tree

Switch3(config)#spanning-tree mst 3 priority 0

Switch4:

Switch4(config)#vlan 20

Switch4(Config-Vlan20)#exit

Switch4(config)#vlan 30

Switch4(Config-Vlan30)#exit

Switch4(config)#vlan 40

Switch4(Config-Vlan40)#exit

Switch4(config)#vlan 50

Switch4(Config-Vlan50)#exit

Switch4(config)#spanning-tree mst configuration

Switch4(Config-Mstp-Region)#name mstp

Switch4(Config-Mstp-Region)#instance 3 vlan 20;30

Switch4(Config-Mstp-Region)#instance 4 vlan 40;50

Switch4(Config-Mstp-Region)#exit

Switch4(config)#interface e1/0/1-7

Switch4(Config-Port-Range)#switchport mode trunk

Switch4(Config-Port-Range)#exit

Switch4(config)#spanning-tree

Switch4(config)#spanning-tree mst 4 priority 0

After the above configuration, Switch1 is the root bridge of the instance 0 of the entire network. In the MSTP

region which Switch2, Switch3 and Switch4 belong to, Switch2 is the region root of the instance 0, Switch3 is

the region root of the instance 3 and Switch4 is the region root of the instance 4. The traffic of VLAN 20 and

VLAN 30 is sent through the topology of the instance 3. The traffic of VLAN 40 and VLAN 50 is sent through

the topology of the instance 4. And the traffic of other VLANs is sent through the topology of the instance 0.

The port 1 in Switch2 is the master port of the instance 3 and the instance 4.

The MSTP calculation generates 3 topologies: the instance 0, the instance 3 and the instance 4 (marked with

blue lines). The ports with the mark “x” are in the status of discarding. The other ports are the status of

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Planet XGS3-24042 User Manual Page 161

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