Siemens SCALANCE XM-400 Configuration Manual page 297

● 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. 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.
● 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:
–
– Discarding
– Listening
–
–
● Fwd. Trans
Specifies the number of changes from the "Discarding" status to the "Forwarding" status.
SCALANCE XM-400/XR-500 Web Based Management (WBM)
Configuration Manual, 05/2017, C79000-G8976-C248-12
Disabled
The port only receives and is not involved in STP, MSTP and RSTP.
In the "Discarding" mode, BPDU frames are received. Other incoming or outgoing
frames are discarded.
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.
Configuring with Web Based Management
5.5 The "Layer 2" menu
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