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Split Horizon

Split horizon is a mechanism to aid in preventing routing loops when distance-vector routing protocols such as RIP are employed in broadcast networks. When split horizon is enabled, the router cannot advertise information about routes on an interface from which the information originates. Split horizon is enabled by default on the router.

You can disable split horizon and enable poison reverse routing updates that advertise routes originating on the interface, but for each of these routes the metric is set to infinity to explicitly advertise that these networks are not reachable.

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