Planet Technology SGSW-4802 - Manual (Page 18)

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3.7.1 STP Port
This function allows assigning Path Cost value and Priority level on each port of SGSW-4802.
Please refer to the detail description of Path Cost and Priority and setup procedures shown as
below.
Description of Parameters
Bridge Port
This option shows the port of the bridge that connects to the root bridge.
Path Cost
The STA algorithm to determine the best path between devices uses this parameter. Therefore,
lower values should be assigned to ports attached to faster media, and higher values assigned to
ports with slower media. (Path cost takes precedence over port priority.)
The default and recommended range is: Ethernet: 100 (50~600) Fast Ethernet: 19 (10~60) Gigabit
Ethernet: 4 (3~10). The allowed range is 0 - 65535.
Priority
Defines the priority for the use of a port in the Spanning Tree algorithm. If the path cost for all ports
on a switch are the same, the port with the highest priority (i.e., lowest value) will be configured as
an active link in the Spanning Tree. Where more than one port is assigned the highest priority, the
port with lowest numeric identifier will be enabled. The range is 0 - 255.
Setup Procedures
Step 1: Select any one of the ports, from 1 to 50, to connect to the root bridge.
Step 2: Key in the value for Path Cost.
Step 3: Set the priority level.
Step 4: Click “Apply” button after you satisfied with the setup. Click “Save” button to save the current
configuration.
!
NOTE
Due the hardware restriction, the STP function cannot across between port 1-24, slot 49
and port 25-48, slot 50.