User manual

Rapid Spanning Tree
7278_en_01 PHOENIX CONTACT 4-3
Now switch to the "RSTP General" menu. Here, you will find various information about the
Spanning Tree configuration.
Figure 4-3 "RSTP General" web page
The web page displays the parameters with which the switch is currently operating.
Port Roles
The root port of a switch connects this switch to the root switch - either directly or via
another switch (designated switch).
The designated port is the port at a designated switch that is connected to the root port
of the next switch.
No additional switches/bridges are connected to edge ports. Termination devices are
connected to edge ports.
An alternate port is a path to the root, which, however, did not become a root port. I.e.,
this port is not part of the active topology.
RSTP Configuration
It is sufficient to set the Rapid Spanning Tree status to "Enable" in order to start RSTP
using default settings. Priority values can be specified for the switch. The root and alternate
ports can be specified via these priority values.
Only multiples of 4096 are permitted. The desired value can simply be entered in the
"Priority" field. The value will be rounded automatically to the next multiple of 4096. Once
you have confirmed the modification by entering your password, the initialization
mechanism is started.
Redundant connections can now be created.
The "Maximum Age of STP Information", "Hello Time", and "Forward Delay" fields have the
same meaning as for STP. These values are used when this switch becomes a root. The
values currently used can be found under RSTP General.