The switch ring network has 3 optical ports
This is the most fundamental ring topology, formed by connecting three or more switches in a closed loop using fiber optic cables. 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. DLR is an EtherNet/IP™ protocol that is defined by the Open DeviceNet® Vendors' Association (ODVA). Taking the construction of a single-ring network with three switches as an example: Primary Switch Configuration: Enable WEB management → enable ERPS function → set the RPL port (Port 1).
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