Thank you for your response.
This is our network topology. Green are existing connections.
As you can see, in case of failure somewhere in the chain, all devices left of breaking point are inaccessible to the router.
We are considering blue one. Since the true ring ethernet configuration is in fact forbidden, we are looking for solution to activate blue branch in case of failure.
There is no spanning tree protocol in TSW110, but RUT950 has support for VLAN.
Can we use that feature? Is there better option?
BR,
Milorad