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 within the Internet that cause certain reachability information to be repeatedly advertised and withdrawn.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.
A router is a computer networking device that forwards data packets across a network toward their destinations, through a process known as routing.
Large modern routers have thus come to resemble telephone switches, with whose technology they are currently converging and may eventually replace, whilst small routers have become a common household item.
A router is normally used to connect at least two networks, but a special variety of router is the one-armed router, used to route packets in a virtual LAN environment.
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