Siemens SIMATIC NET SCALANCE SC-600 Configuration Manual page 97

The table has the following columns:
• Port
Shows the interfaces via which the device communicates.
• Role
Shows the status of the port. The following values are possible:
– Disabled
– Designated
– Alternate
– Backup
– Root
– Master
• Status
Shows the current status of the interface. The values are only displayed. The
parameter depends on the configured protocol.
– Discarding
– Listening
– Learning
– Forwarding
• Oper. Version
Shows the compatibility mode of Spanning Tree used by the port.
• 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
SCALANCE SC-600 Web Based Management (WBM)
Configuration Manual, 10/2021, C79000-G8976-C475-03
The port was removed manually from the spanning tree and will no longer be taken
into account by the spanning tree.
The ports leading away from the root bridge.
The port with an alternative route to a network segment
If a switch has several ports to the same network segment, the "poorer" Port
becomes the backup port.
The port that provides the best route to the root bridge.
This port points to a root bridge located outside the MST region.
The port receives BPDU frames. Other incoming or outgoing frames are discarded.
The port receives and sends BPDU frames. The port is involved in the spanning
tree algorithm. Other outgoing and incoming frames are discarded.
The port actively learns the topology; in other words, the node addresses. Other
outgoing and incoming frames are discarded.
Following the reconfiguration time, the port is active in the network. The port
receives and sends data frames.
Configuring with Web Based Management
4.3 "Information" menu
97