Siemens SIMATIC NET SCALANCE W760 Series Configuration Manual page 208

Configuring with Web Based Management
5.7 "Layer 2" menu
● 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 Cost" box.
● 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" 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:
– 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 "State" parameter depends on the configured protocol. The following is
possible for status:
– Disabled
– Discarding
– Listening
– Learning
– Forwarding
● Fwd. Trans
Specifies the number of changes from the "Discarding" status to the "Forwarding" status.
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T he 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.
I n this status, BPDUs are both received and sent. The port is involved in the spanning
tree algorithm.
S tage prior to the forwarding status, the port is actively learning the topology (in other
words, the node addresses).
F ollowing the reconfiguration time, the port is active in the network; it receives and
forwards data frames.
SCALANCE W760/W720 to IEEE 802.11n Web Based Management
Configuration Manual, 11/2014, C79000-G8976-C350-03