XS712T Smart Switch
If you do not specify a root bridge and all switches have the same Bridge Priority value, the switch with the lowest MAC address is elected as the root bridge (see CST Configuration on page 101).
5.From the CST Port Configuration screen, select ports
6.Click Apply.
7.Select ports
Since the edge ports are not at risk for network loops, ports with Fast Link enabled transition directly to the Forwarding state.
8.Click Apply.
You can use the CST Port Status screen to view spanning tree information about each port.
9.From the MST Configuration screen, create a MST instances with the following settings:
•MST ID. 1
•Priority. Use the default (32768)
•VLAN ID. 300
For more information, see MST Configuration on page 106.
10.Click Add.
11.Create a second MST instance with the following settings
•MST ID. 2
•Priority. 49152
•VLAN ID. 500
12.Click Add.
In this example, assume that Switch 1 has become the Root bridge for the MST instance 1, and Switch 2 has become the Root bridge for MST instance 2. Switch 3 has hosts in the Sales department (ports g1, g2, and g3) and in the HR department (ports g4 and g5). Switches 1 and 2 also have hosts in the Sales and Human Resources departments. The hosts connected from Switch 2 use VLAN 500, MST instance 2 to communicate with the hosts on Switch 3 directly. Likewise, hosts of Switch 1 use VLAN 300, MST instance 1 to communicate with the hosts on Switch 3 directly.
The hosts use different instances of MSTP to effectively use the links across the switch. The same concept can be extended to other switches and more instances of MSTP.
