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In computer networking and telecommunications, a flapping router is a router that transmits routing updates alternately advertising a destination network first via one route, then via a different route. Route flapping refers to pathological conditions(hardware errors, software errors, configuration errors,unreliable connections, etc.) within the Internet that cause certain reachability information to be repeatedly advertised and withdrawn. Route flapping often forces a router to recalculate a new or preferred route to a particular network, while traffic destined for that network is in transit through the router.
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