Siemens SCALANCE XM-400 Configuration Manual page 302

Configuring with Web Based Management
5.5 The "Layer 2" menu
Table 1 has the following columns:
● 1st column
Shows that the settings are valid for all ports.
● MSTP Status
Select the setting from the drop-down list. You have the following setting options:
– Enabled
– Disabled
– No Change: Table 2 remains 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 all available ports and link aggregations.
● MSTP Instance ID
ID of the MSTP instance.
● MSTP Status
Click the check box to enable or disable this option.
● 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.
Factory setting: 128
● Cost Calc.
Enter the path cost calculation in the input box. If you enter the value "0" here, the
automatically calculated value is displayed in the next box "Path Costs".
● Path cost
The path costs from this port to the root bridge. The path with the lowest value is selected
as the path. If several ports of a device have the same value, the port with the lowest port
number will be selected.
If the "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 rate, the lower the value for the path costs will be.
Typical values for rapid spanning tree are as follows:
– 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 XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12