Planet GS-4210-24T4SR User Manual page 177

In this example, only the default STP values are used.
The switch with the lowest Bridge ID (switch C) was elected the root bridge, and the ports were selected to give a high port cost
between switches B and C. The two (optional) Gigabit ports (default port cost = 20,000) on switch A are connected to one
(optional) Gigabit port on both switch B and C. The redundant link between switch B and C is deliberately chosen as a 100 Mbps
Fast Ethernet link (default port cost = 200,000). Gigabit ports could be used, but the port cost should be increased from the
default to ensure that the link between switch B and switch C is the blocked link.
This section has the following items:

STP Global Setting

STP Port Setting

CIST Instance Setting

CIST Port Setting

MST Instance Setting

MST Port Setting

STP Statistics
Figure 4-3-56: After Applying the STA Rules
Configures STP system settings
Configuration per port STP setting
Configure system configuration
Configure CIST port setting
Configuration each MST instance setting
Configuration per port MST setting
Display the STP statistics
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User's Manual of GS-4210 Series