Split horizon

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split horizon is a mechanism to avoid routing loops in ditance-vector routing protocols by reducing incorrect routing information and routing overhead. The concept of it's work is very simple: a route will never advertise by a router to the interface which it was learned from. It is simple to implement and some distance-vector routing protocols are using it. the RIP and VPLS is two important routing protocols (supported by Mikrotik RouterOS until this article writing time), which use split horizon.

Example:

According to the diagram, A router does not send it's route for C router back to B router. Split-horizon.jpg

--Vahid Alimohamadi 19:32, 4 January 2013 (UTC)