This article relates to the following DV (Distance Vector) routing protocols:
The Split Horizon is an active mechanism by default.
Without Split Horizon
By default, a router using a "Distance Vector" routing protocol will send its full routing table to its neighbors.
The example below is the RIP protocol.
We can see that the R1 Router sends (via a RIP Update message) its entire routing table to its neighbors. Except that the R2 Router will not take into account information about the networks that are directly connected to it.
With Split Horizon
Split – Horizon (divided horizon) makes sure not to pass unnecessary information to its neighbors. This reduces the bandwidth used to dynamically keep our routing tables up to date.
We were taught by the R2 router.
Network 1 is our interconnection link.
So we're only going to teach him networks that aren't directly connected to him!
The Split Horizon is enabled by default.
It can be a problem if we use Frame Relay.
Router (config) - FastEthernet interface 0/1 Router (config-if) no ip split-horizon eigrp X
Router (config) - FastEthernet interface 0/1 Router (config-if) no ip split-horizon
Hoping this article has been helpful to you! Don't hesitate to let me know!!
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