● State
Displays the current state of the port. The values are only displayed. The parameter
depends on the configured protocol. The following statuses are possible:
– Discarding
The port receives BPDU frames. Other incoming or outgoing frames are discarded.
– Listening
The port receives and sends BPDU frames. The port is involved in the spanning tree
algorithm. Other outgoing and incoming frames are discarded.
– Learning
The port actively learns the topology; in other words, the node addresses. Other
outgoing and incoming frames are discarded.
– Forwarding
Following the reconfiguration time, the port is active in the network. The port receives
and sends data frames.
● Oper. Version
Describes the type of spanning tree in which the port operates
● Priority
If the path calculated by the spanning tree is possible over several ports of a device, the port
with the highest priority (in other words the lowest value for this parameter) is selected. A
value between 0 and 240 can be entered for the priority in steps of 16. If you enter a value
that cannot be divided by 16, the value is automatically adapted. The default is 128.
● Path Cost
This parameter is used to calculate the path that will be selected. The path with the lowest
value is selected as the route. If several ports of a device have the same value, the port with
the lowest port number will be selected.
If the value "Cost Calc." box 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.
Configuring with Web Based Management
6.4 "Information" menu
SCALANCE W1780/W1740 according to IEEE 802.11ac Web Based Management
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Configuration Manual, 11/2019, C79000-G8976-C485-03