Siemens SIMATIC NET SCALANCE W760 Series Configuration Manual page 213

Table 2 has the following columns:
● Port
Shows all available ports and interfaces.
● 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.
The default is 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 Cost".
● 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 is selected.
If the value in the "Cost Calc" field is "0", the automatically calculated value is displayed.
Otherwise, the value of the "Cost Calc" field 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:
– 1000 Mbps = 20,000
– 100 Mbps = 200,000
– 10 Mbps = 2,000,000
The values can, however, also be set individually.
● State
Displays the current status of the port. The values are only displayed and cannot be
configured. The following is possible for status:
– Discarding
– Blocked
– Forwarding
● Fwd. Trans.
Specifies the number of status changes Discarding - Forwarding or Forwarding -
Discarding.
SCALANCE W760/W720 to IEEE 802.11n Web Based Management
Configuration Manual, 11/2014, C79000-G8976-C350-03
The port exchanges MSTP information but is not involved in the data traffic.
In the blocking mode, BPDU frames are received.
The port receives and sends data frames.
Configuring with Web Based Management
5.7 "Layer 2" menu
213