Siemens SIMATIC NET SCALANCE SC-600, Руководство по настройке

Страница: 242 / 372

Configuring with Web Based Management
4.5 "Layer 2" menu
SCALANCE SC-600 Web Based Management (WBM)
242
Configuration Manual, 10/2021, C79000-G8976-C475-03
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 "Cost Calc." is "0", the automatically calculated value is shown. If a
value other than "0" is entered, 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 RSTP:
– 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.
• Status
Displays the current status of the port. The values are only displayed and cannot be
configured. The "Status" parameter depends on the configured protocol. The
following values are possible:
– Disabled
The port only receives and is not involved in STP and RSTP.
– Discarding
In the "Discarding" mode, BPDU frames are received. Other incoming or outgoing
frames are discarded.
– Listening
In this status, BPDUs are both received and sent. The port is involved in the
spanning tree algorithm.
– Learning
Stage prior to the "Forwarding" status, the port is actively learning the topology (in
other words, the node addresses).
– Forwarding
Following the reconfiguration time, the port is active in the network; it receives and
forwards data frames.
• Fwd. Trans
Specifies the number of changes from the "Discarding" status to the "Forwarding"
status.