Rapid Spanning Tree Protocol (RSTP) is needed if you want to set up redundant cabling via loops.
By default it is disabled and even if you update your DICENTIS Conference Software it will be again disabled and has to be activated afterwards. Also third party switches must comply with IEEE802:1D-20- 04 and support RSTP.
Please also note that loops have a limited hops which are lower than 21 (devices). If you need more information regarding this please have a look in the installation manual.
With the old DCNM-PS it is not possible to loop to other DCNM-PS devices.
With the DCNM-PS2 you can loop it as you please and give your system more redundancy.
Type in the search column (Windows + S key ) "advanced system settings" than click on "Advanced" and on "Environment Variables".
Create a system environment variable named DCNM_RSTP_ENABLED and set the value to 1 to enable RSTP, and 0 to disable RSTP.
Restart the DICENTIS services.
Additional way to find this settings… (not needed it's just a another way how to do it)
Additional you can open the file explorer (Windows + E Key) and do a right mouse click on "This PC". After that select Properties and open Advanced system settings.
Click on "Advanced" and on "Environment Variables"
Now change the "Variable value" from 0 to 1 to activate the RSTP
Restart services of the DICENTIS.