Pilz PSSnet SHL 8T MRP - Manual (Page 99)

Redundancy
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Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
6.1 Ring Redundancy
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Note: Activate the MRP compatibility (Rapid Spanning Tree:Global) on all
devices in a MRP-Ring if you want to use RSTP in the MRP-Ring. If this is
not possible, e.g, because several devices do not support MRP compatibility,
deactivate the Spannung Tree Protocol on the ports connected to the MRP-
Ring. Spanning Tree and Ring redundancy affect each other.
If you combine RSTP with a MRP-Ring, take care to configure the bridges in
the MRP-Ring with a better RSTP bridge priority than those in the connected
RSTP network. Thus you avoid connection interruptions in case the devices
in the MRP-Ring detect a failure and shut down.