Interlogix NS3702-24P-4S User Manual - Manual (Page 145)

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STP Operation Levels
The Switch allows for two levels of operation: the switch level and the port level. The switch level forms a spanning tree consisting of
links between one or more switches. The port level constructs a spanning tree consisting of groups of one or more ports. The STP
operates in much the same way for both levels.
On the switch level, STP calculates the Bridge Identifier for each switch and then sets the Root
Bridge and the Designated Bridges.
On the port level, STP sets the Root Port and the Designated Ports.