 - Split horizon is a method of preventing a routing loop in a network. The basic principle is simple: Information about the routing for a particular packet is never sent back in the direction from which it was received.
Split horizon can be achieved by means of a technique called poison
reverse. This is the equivalent of route poisoning all
possible reverse paths - that is, informing all routers that the path back to
the originating node for a particular packet has an infinite metric. Split
horizon with poison reverse is more effective than simple split horizon in
networks with multiple routing paths, although it affords no improvement
over simple split horizon in networks with only one routing path.
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18 Apr 2007
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