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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

ip split-horizon — interface

Synopsis

ip split-horizon [as-number]
no ip split-horizon [as-number]

Configures

Split horizon for the interface

Default

Varies with the interface type; usually enabled

Description

When split horizon is enabled, any route learned from an interface is not advertised back out the same interface. This rule is intended to stop routing loops with distance-vector protocols. To enable split-horizon for EIGRP, specify the EIGRP as-number.

With most interfaces, split horizon is enabled. However, with multipoint interfaces—such as a multipoint Frame Relay interface—split horizon is disabled. See Chapter 8 for more information on split horizon.

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