In computer networking and telecommunications, route flapping occurs when a router alternately advertises a destination network via one route then another, or as unavailable and then available again, in quick sequence.
Route flapping is caused by pathological conditions (hardware errors, software errors, configuration errors, intermittent errors in communications links, unreliable connections, etc.) within the network which cause certain reachability information to be repeatedly advertised and withdrawn. For example, link flap occurs when an interface on a router has a hardware failure that causes the router to announce it alternately as "up" and "down".
In networks with link-state routing protocols, route flapping will force frequent recalculation of the topology by all participating routers. In networks with distance-vector routing protocols, route flapping can trigger routing updates with every state change. In both cases, it prevents the network from converging.
Route flapping can be contained to a smaller area of the network if route aggregation is used. As an aggregate route will not be withdrawn as long as at least one of the aggregated subnets is still valid, a flapping route that is part of an aggregate will not disturb the routers that receive the aggregate.[1]
^CCNP 1 Advanced Routing Companion Guide. Indianapolis: Cisco Press. 2004. p. 50. ISBN 1-58713-135-8.
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state. In these cases it is called chattering or flapping, as in valve chatter, and routeflapping. The simplest mechanical oscillating system is a weight...
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keeps a router from receiving route updates until the network appears to be stable—until either an interface stops changing state (flapping) or a better...
IBGP) RFC 3065 (Autonomous System Confederations for BGP) RFC 2439 (BGP RouteFlap Damping) RFC 4893 (BGP Support for Four-octet AS Number Space) RFC 1657...
contemporary peers in areas of BGP table capacity, MPLS LSP capacity, routeflapping recovery at OC-192 speeds, convergence at both OC-192 and OC-48 speeds...
routing posture of networks. Incorrect routing or routing issues cause undesirable performance degradation, flapping or downtime. Monitoring routing in...
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flattop broiler, topped with sliced American cheese (with a two crispy cheese flaps cooked on the flattop that hang off the sandwich), and caramelized onions...
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only about position but also about the timing of flapping. The birds behind will sync with the flapping pattern of the leading bird to follow the trail...
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