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GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
In this example, ports g1–g5 are connected to host stations, so those links are not subject to
network loops. Ports g6–g8 are connected across Switches 1, 2, and 3.
Ports g1-g5
Switch 1
connected to hosts
root bridge
Switch 2
Switch 3
Ports g1-g5
connected to hosts
Ports g1-g5
connected to hosts
Ports g6-g8
connected to Switch 2 and 3
Ports g6-g8
connected to Switch 1 and 2
Perform the following procedures on each switch to configure MSTP:
1. Use the VLAN Configuration screen to create VLANs 300 and 500.
For more information, see VLAN Configuration on page 81.
2. Use the VLAN Membership screen to include ports g1–g8 as tagged (T) or untagged (U)
members of VLAN 300 and VLAN 500.
For more information, see VLAN Membership Configuration on page 83.
3. In the STP Configuration screen, enable the Spanning Tree State option.
For more information, see STP Configuration on page 92.
Use the default values for the rest of the STP configuration settings. By default, the STP
operation mode is MSTP
, and the configuration name is the switch MAC address.
4. In the CST Configuration screen, set the Bridge Priority value for each of the three switches
to force Switch 1 to be the root bridge:
•Switch 1. 4096
•Switch 2. 12288
•Switch 3. 20480
Note: Bridge priority values are multiples of 4096.
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.