TP-Link T3700G-52TQ User Manual page 127

Choose the menu Spanning Tree→Port Config→Port Config to load the following page.
Configuration Procedure:
Configure the parameters of the ports for CIST.
Entry Description:
Port Config

UNIT:
Select:
Port:
Status:
Priority:
Ext-Path Cost:
Figure 8-6 Port Config
Select the desired unit or LAGs.
Select the desired port for STP configuration. It is multi-optional.
Displays the port number of the switch.
Enable or disable spanning tree function on the desired port.
Enter the value of port priority from 0 to 240 divisible by 16, and the
default value is 128.
The port with the lower value has the higher priority. In the same
condition, the port with the highest priority will be elected as the root
port in CIST.
Enter the value of the external path cost. The default setting is Auto,
which means the port calculates the path cost automatically
according to the port's link speed.
In MSTP, External path cost is the path cost of the port in CST. The
port with the lowest external root path cost will be elected as the
root port in CIST.
In STP/RSTP, external path cost indicates the path cost of the port in
the spanning tree. The port with the lowest external root path cost
will be elected as the root port.
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