Siemens SIMATIC NET SCALANCE S615 Configuration Manual page 226

Configuring with Web Based Management
4.7 "Layer 2" menu
Description
Table 1 has the following columns:
● All ports
Shows that the settings are valid for all ports of table 2.
● Spanning Tree Status
In the drop-down list, select the setting for all ports. If "No Change" is selected, the entries
of the corresponding column in table 2 remain unchanged.
● Copy to Table
If you click the button, the setting is adopted for all ports of table 2.
Table 2 has the following columns:
● Port
Shows the available ports.
● Spanning Tree Status
Specify whether or not the port is integrated in the spanning tree.
Note
If you disable the "Spanning Tree Status" option for a port, this may cause the formation of
loops. The topology must be kept in mind.
● Priority
Enter the priority of the port. The priority is only evaluated when the path costs are the same.
The value must be divisible by 16. If the value that cannot be divided by 16, the value is
automatically adapted.
Range of values: 0 - 240.
The default is 128.
● Cost Calc.
Enter the path cost calculation. If you enter the value "0" here, the automatically calculated
value is displayed in the "Path costs" box.
● Path Cost
This parameter is used to calculate the path that will be selected. The path with the lowest
value is selected as the path. If several ports of a device have the same value for the path
costs, the port with the lowest port number is selected.
If the value in the box "Cost Calc." is "0", the automatically calculated value is shown.
Otherwise, the value of the "Cost Calc." box is displayed.
The calculation of the path costs is largely based on the transmission speed. The higher the
achievable transmission speed is, the lower the value of the path costs.
Typical values for path costs with rapid spanning tree:
– 10,000 Mbps = 2,000
– 1000 Mbps = 20,000
– 100 Mbps = 200,000
– 10 Mbps = 2,000,000
The values can, however, also be set individually.
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SCALANCE S615 Web Based Management
Configuration Manual, 11/2019, C79000-G8976-C388-08