Network flapping

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Flapping

Written by Editor  in Letter F

Flapping, in computer networking, is a problem condition that can occur with dynamic routers on large internet works. Learn all about flapping-routers reading this article.

What is Flapping?

A problem condition that can occur with dynamic routers on large internet works. When a router is flapping (called a “flapping router”), it broadcasts routing table updates that alternate between two different routes to a host.

For example, the flapping router might indicate during the first broadcast that route A is the best route to a given host, indicate during the second broadcast that route B is the best route, indicate during the following broadcast that route A is best, and so on.

Flapping routers thus generate unnecessary routing traffic over the network. This generally happens when a router is unnecessarily configured to load-balance between paths with equal hop counts. To determine whether a router is flapping, use a network packet sniffer.

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