SNR S2940-8G-v2, Configuration Manual

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SNR S2940-8G-v2 Switch Configuration Guide
MSTP Configuration
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 forwarding. Because the instance 3 and the instance 4 are only valid in the
MSTP region, the following figure only shows the topology of the MSTP region.
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