Common redundancy protocols include RSTP for general switching, MRP and DLR for ring topologies, HSR and PRP for zero-switchover hitless redundancy, and ERPS for utility-grade Ethernet rings. Proper redundancy design is critical for safety and production continuity. DLR is an EtherNet/IP™ protocol that is defined by the Open DeviceNet® Vendors' Association (ODVA). DLR network includes at. In the realm of Industrial Internet of Things (IIoT), the significance of robust and reliable networking infrastructure cannot be overstated. Industrial switches, as the core components of this infrastructure, play a pivotal role in establishing and maintaining the integrity of industrial ring. The fiber optic ring redundancy design for industrial Ethernet switches is precisely engineered to address this pain point—achieving millisecond-level fault self-healing through the synergy of physical ring architecture and intelligent protocols, thereby constructing the "self-healing heart" of. This guide walks you through everything you need to know about fiber ring networks—from basic concepts to topology diagrams and essential protocols. What Is a Fiber Optic Ring Network? A fiber optic ring network is a physical or logical network topology where devices (usually switches) are. Device Level Ring (DLR) is a Layer 2 protocol that enables redundancy in a ring topology, providing fast network fault detection and reconfiguration for industrial networks. Devices are connected in a closed ring topology, with a Redundancy Manager (RM) controlling the ring state.