Hirschmann RS20 User Manual page 83

Spanning Tree
Note: The parameters
– Forward Delay and
– Max Age
have a relationship to each other:
Forward Delay ≥ (Max Age/2) + 1
If you enter values that contradict this relationship, the device then
replaces these values with a default value or with the last valid values.
 When necessary, change and verify the settings and displays that
relate to each individual port (dialog: Rapid Spanning
Tree:Port).
Figure 39: Configuring RSTP for each port
Note: Deactivate the Spanning Tree Protocol on the ports connected to
a redundant ring, because Spanning Tree and Ring Redundancy work
with different reaction times.
UM Redundancy Configuration L2E
Release 7.1 12/2011
5.6 The Rapid Spanning Tree
Protocol
83