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    Routing protocols operate at what OSI layers?

    Gods Son

      What layer do the different routing protocols (OSPF, ISIS, EIGRP and RIP) operate on? I am asking this question because to me it seems like besides BGP which operates on the application layer, we can’t pin point the layer the other routing protocols operate at.

       

      Do they operate on the network layer? Wikipedia says RIP operates on the application layer and OSPF operates on the internet layer of the internet protocol suite. Is this correct and if so, can anyone please explain how RIP is an application layer protocol.

       

      Also is it logical to try to determine what OSI layer these routing protocols operate on? Or do we just conclude that the OSI is just a guide and some of these protocols were created before the OSI model was designed so it is unreasonable to try to determine the layers they operate on?

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