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Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.

When a route in an IP network goes down, the router that knows about the change advertises it to neighboring routers. Those routers then recalculate their routes. Route flapping is when this occurs rapidly and possibly on a large scale. Route flapping can get out of control and affect network performance.

The Internet is protected from route flapping on private networks because private networks advertise only a summary of their internal routes. This is one reason for using both interior and exterior routing protocols-that is, OSPF (Open Shortest Path First) and BGP (Border Gateway Protocol).

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