What is split horizon?

Question

A split horizon will not advertise a route back to the same router it learned the route from.

Accepted Answer

Answer

Information about a route should not be sent back in the direction from which the original update came.

Answer

It splits the traffic when you have a large bus (horizon) physical network.

Answer

It holds the regular updates from broadcasting to a downed link.

Answer

It prevents regular update messages from reinstating a route that has gone down.