Siemens SCALANCE W1780 Configuration Manual page 274

Configuring with Web Based Management
6.7 "Layer 2" menu
● 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." box has the value "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:
– 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 state 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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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.
Stage prior to the forwarding status, the port is actively learning the topology (in other
words, the node addresses).
Following the reconfiguration time, the port is active in the network; it receives and
forwards data frames.
SCALANCE W1780/W1740 according to IEEE 802.11ac Web Based Management
Configuration Manual, 11/2019, C79000-G8976-C485-03