Hirschmann RS20 Reference Manual page 150

Redundancy 6.1 Ring Redundancy
Figure 42: Selecting ring redundancy, entering ring ports, enabling/disabling ring
manager and selecting ring recovery.
Note: Deactivate the Spanning Tree protocol (STP) for the ports connected
to the redundant ring, because the Spanning Tree and the Ring Redundancy
work with different reaction times (Redundancy:Spanning Tree:Port).
If you used the DIP switch to activate the HIPER-Ring function, STP is
automatically switched off.
Note: If you have configured VLANS, note the VLAN configuration of the ring
ports.
In the configuration of the HIPER-Ring, you select for the ring ports
– VLAN ID 1 and "Ingress Filtering" disabled in the port table and
– VLAN membership U in the static VLAN table.
Note: If you are also using redundant ring/network coupling, make sure that
the device is transmitting VLAN 1 packets tagged on the two ring ports.
RM GUI L2E
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Release 8.0 05/2013