Hirschmann RS20 Programming Manual page 100

Rapid Spanning Tree
Figure 51: Operation on/off
You now connect the redundant lines.
Define the desired Switch as the root Switch by assigning it the
lowest priority in the bridge information among all the Switches in the
network, in the "Protocol Configuration/Information" frame. Note that
only multiples of 4096 can be entered for this value
In the "Root Information" frame, the dialog shows this device as the
root.
A root switch has no root port and no root costs.
As required, you change the default priority value of 32768 in other
Switches in the network in the same way to the value you want
(multiple of 4096).
For each of these Switches, check the display
in the "Root Information" frame:
– Root-Id: Displays the bridge identifier of the root Switch
– Root Port: Displays the port that leads to the root Switch
– Root Cost: Displays the root costs to the root Switch
in the "Protocol Configuration/Information" frame:
– Priority: Displays the priority in the bridge identifier for this Switch
– MAC Address: Displays the MAC address of this Switch
– Topology Changes: Displays the number of changes since
the start of RSTP
– Time since last change: Displays the time that has elapsed since
the last network reconfiguration
100
6.6 The Rapid Spanning Tree Protocol
(see table 14).
Redundanz L2P
Release 5.0 04/09