Split horizon rule

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In routing protocols, the split horizon rule states that a router must not readvertise a route to the router from which a route was first learned. It is a means of preventing loops from forming, and is used with distance vector protocols such as Routing Information Protocol (RIP) and the Interior Gateway Routing Protocol, and the path vector protocol, Border Gateway Protocol.

Distance vector

General case

Nonbroadcast multiaccess case

Path vector

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