Pilz PSSnet SHL 8T MRP - Manual (Page 105)

Redundancy
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6.2 Ring/Network coupling
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Note: If you have configured VLANS, note the VLAN configuration of the
coupling and partner coupling ports.
In the Ring/Network Coupling configuration, select for the coupling and
partner coupling ports
– VLAN ID 1 and “Ingress Filtering” disabled in the port table and
– VLAN membership MU in the static VLAN table.
Note: If you are operating the Ring Manager and two-Switch coupling
functions at the same time, there is the risk of creating a loop.