(Rapid) Spanning Tree
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PHOENIX CONTACT
5-9
Admin Edge Port
Here you can specify whether this port is to be operated as an edge port (default setting), if
possible.
Priority
Indicates the priority set for this port (default 128). Due to backward compatibility with STP,
priority values can be set that are not configurable in RSTP.
Admin Path Cost
Indicates the path cost set for this port. A path cost equal to “0” activates the cost calculation
according to the transmission speed (10 Mbps = 2000000; 100 Mbps = 200000; 1000 Mbps
= 20000).
Path Cost
Indicates the path cost used for this port.
Forward Transitions
Indicates how often the port switches from the “Discarding” state to the “Forwarding” state.
Additional parameters provide information about the network paths in a stable topology that
are used by the BPDU telegrams.
Designated Root
Root bridge for this Spanning Tree.
Designated Bridge
The switch from which the port receives the best BPDUs. The value is based on the priority
value in hex and the MAC address.
Designated Port
Port via which the BPDUs are sent from the designated bridge. The value is based on the
port priority (2 digits) and the port number.
Designated Cost
Indicates the path cost of this segment to the root switch.
Protocol Compatibility
Figure 5-6
Protocol compatibility
If a port receives STP BPDUs, it switches automatically to STP mode. Automatic switching
to (R)STP mode does not take place. Switching to (R)STP mode can only be forced via
“ForceRSTP” or via a restart.
