Manual

+7(495) 797-3311 www.qtech.ru

Москва, Новозаводская ул., 18, стр. 1

Cost

Port 2

200000

Port 3

200000

Port 4

200000

Port 5

200000

Port 6

200000

Port 7

200000

By default, the MSTP establishes a tree topology (in blue lines) rooted with SwitchA. The ports

marked with “x” are in the discarding status, and the other ports are in the forwarding status.

Configurations Steps:

Step 1: Configure port to VLAN mapping:

Create VLAN 20, 30, 40, 50 in Switch2, Switch3 and Switch4.

Set ports 1-7 as trunk ports in Switch2 Switch3 and Switch4.

Step 2: Set Switch2, Switch3 and Switch4 in the same MSTP:

Set Switch2, Switch3 and Switch4 to have the same region name as mstp.

Map VLAN 20 and VLAN 30 in Switch2, Switch3 and Switch4 to Instance 3; Map VLAN 40 and

VLAN 50 in Switch2, Switch3 and Switch4 to Instance 4.

Step 3: Set Switch3 as the root bridge of Instance 3; Set Switch4 as the root bridge of Instance

Set the bridge priority of Instance 3 in Switch3 as 0.

Set the bridge priority of Instance 4 in Switch4 as 0.

The detailed configuration is listed below:

Switch2:

Switch2(config)#vlan 20

Switch2(Config-Vlan20)#exit

Switch2(config)#vlan 30

Switch2(Config-Vlan30)#exit

Switch2(config)#vlan 40

Switch2(Config-Vlan40)#exit

Switch2(config)#vlan 50

Switch2(Config-Vlan50)#exit

Switch2(config)#spanning-tree mst configuration

Switch2(Config-Mstp-Region)#name mstp

Switch2(Config-Mstp-Region)#instance 3 vlan 20;30

Switch2(Config-Mstp-Region)#instance 4 vlan 40;50

Switch2(Config-Mstp-Region)#exit

Switch2(config)#interface e1/0/1-7