RIPv2: Route Poisoning

Route Poisoning is a mechanism used  to immediately remove routes that have become unreachable.  To accomplish this the router detecting the failure immediately sets the metric for the down network to Infinity (16) and advertises that route to its neighbors.  Routers that receive this advertisement from the router considered the next hop to that network immediately accept the route and remove it from their tables as well.

Even though the route has been removed from the routing table, the route will remain in RIPv2’s RIB for the duration of the flushed after and invalid after seconds.

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