The migration of RSTP-supported devices to PRP/HSR networks has been hampered by interoperability issues, but now a new solution that enables hybrid topologies of RSTP, PRP and HSR-based networks has been created. Overcoming all interoperability issues, this solution helps the large number of substations fitted with multiple legacy devices to seamlessly migrate to High-availability Seamless Redundancy (HSR)-based networks. For substations, this cost-effective solution not only brings a stay of execution for their many SANs (single attached nodes) and DANs (dual double attached nodes), but also enables them to tap into the benefits of a modern automated smart grid substation. Put simply, this new solution extends the lifetime of legacy devices and defers replacement costs.