FEATURES OF RFC 1058

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routing protocols by prohibiting a router from advertising a route back onto the interface from which it was learned. Thus when a device that participates in such route advertisements receive an update from an interface, it (the device) does not forward updates through the same interface out. By so doing, routing loops are prevented.
In example given below, network node A routes packets to node B in order to reach node C. The links between the nodes are distinct point-to-point links.

According to the split-horizon rule, node A does not advertise its route for C (namely A to B to C) back to B. On the surface, this seems redundant since B will never route via node A because the route costs more than the direct route from B to C. However, if the link between B and C goes down, and B had received a route from A, B could end up using that route via A. A would send the packet right back to B, creating a loop. With the split-horizon rule in place, this particular loop scenario cannot ...

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protocol for exchanging routing
information among gateways and other hosts. It is intended to be
used as a basis for developing gateway software for use in the
Internet community. Distribution of this memo is unlimited.

Table of Contents

1. Introduction 2
1.1. Limitations of the protocol 4
1.2. Organization of this document 4
2. Distance Vector Algorithms 5
2.1. Dealing with changes in topology 11
2.2. Preventing instability ...

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