Interlogix NS3500-28T-4S User Manual - Manual (Page 146)

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Figure 4-6-3 After Applying the STA Rules
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 Configures STP system settings
 STP Port Setting Configuration per port STP settings
 CIST Instance Setting Configure system configuration
 CIST Port Setting Configure CIST port setting
 MST Instance Setting Configuration each MST instance settings
 MST Port Setting Configuration per port MST setting
 STP Statistics Display the STP statistics