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In 2011, was a problem to practically implement this configuration, but in 2025 we have Cisco 8500 Series Secure Routers making this project easy to realize. EIGRP protocol is used to share the information from one router to the neighbor routers if they exist in the same region. It is a complex protocol, but it can be configured and make work easily in small and large networks. It is also a hybrid protocol because it uses the features of the both distance vector routing and link-state routing protocol. Enhanced Interior Gateway Routing Protocol supports rapid convergence and reduces bandwidth usage.
Fiber Optic backbones have been used effectively in industrial Ethernet systems requiring high-speed communications with excellent noise characteristics. Since the fiber optic cable is impervious to electric and magnetic fields, all conventional electrically generated cross talk and interference is eliminated.
In the event that great distances (over 100m) separate nodes, fiber optic backbones can realize very cost effective Ethernet systems. To remove the limitation of media failure, Ethernet switches have been used effectively in ring topology installations where long fiber distances and low bandwidth were requirements. When the switches are to be located so far apart that it becomes cost prohibitive to run a dedicated cable (like Ethernet electrical wire) from the main server or hub directly to each individual switch, creating an isolated, efficient connection for better performance, ring topology offers a definite cost saving alternative.
To remove the limitation of media failure, Ethernet switches have been used effectively in ring topology installations where long fiber distances and low bandwidth were requirements. When the switches are to be located so far apart that it becomes cost prohibitive to make a dedicated cable for each switch, ring topology offers a definite cost saving alternative.
In addition, industrial ring topology offers media redundancy. In the event that the fiber link is broken, the redundancy manager heals the ring by re-directing traffic. For industrial applications,
the traditional spanning tree algorithm is much to slow to use in control and high-speed data acquisition applications. This has led to the development of the “higher speed” protocols now being used by prominent leaders in the industrial network arena.
At that time in 2011, my initial thought or idea was to use cheaper 40Gb separate transceivers and routers [6] [7], now we have available on the market transceivers in a QSFP28 form factor that can be used in such a project. Like the native 40Gb BiDi, the dual-rate 40 Gb BiDi transmits bi-directionally on both fibers, using nominal wavelengths of 850nm and 910nm and passive wavelength division multiplexing (WDM) filters at either end isolate Tx and Rx channels. In 40Gb mode, it transmits and receives 20Gb NRZ channels on each fiber, for a total aggregate bandwidth of 40Gb. OSPF is an Interior Gateway Protocol. It is used to find the best path between the source and the destination router using its own Shortest Path First. OSPF will handle the routing paths a lot better than RIP.
EIGRP is the Enhanced Interior Gateway Routing Protocol. EIGRP is a Cisco routing protocol based on their original Interior Gateway Routing Protocol. EIGRP can be used better on networks where all routers are Cisco routers. It is an excellent routing protocol and is used in so many large networks today. EIGRP is not too difficult to configure and it can handle even the largest networks.
For 40 km fiber links with Cisco, common wavelengths are 1550nm for long-reach (ER/LR) SFPs (like SFP-10G-ER/SFP+ ER) or specific CWDM/DWDM wavelengths (e.g., 1470nm, 1530nm, or 1550nm) for higher density/WDM systems, and BiDi (Bidirectional) modules use complimentary pairs like 1270nm/1330nm on a single fiber strand for distances up to 40km, all designed for single-mode fiber (SMF).
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