Transition Networks MIL-SM808GPXX - Manual (Page 105)

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The priority and path cost can be configured for each port. Click the Apply button to
modify the configuration .
Parameter Description
Port
Priority
A change to the Port Priority affects which port will be the root port.
The lowest number has the highest priority. The range is 0-255 and
the default setting for all ports is 128.
Path Cost
Path Cost specifies the path cost of the port that the switch uses to
determine which ports are the forwarding ports. The lowest number
becomes the forwarding port. The range is 1-65535 and the default
value is based on IEEE802.1D