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routing loop

A network problem in which packets continue to be routed in an endless circle. It is caused by a router or line failure, and the notification of the downed link has not yet reached all the other routers. It can also occur over time due to normal growth or when networks are merged together. See route poisoning.

route poisoning

The notification to a router that a route is down by giving it a number that represents an infinite number of hops. In the case of RIP protocols, 16 is the infinite metric. See holddown timer and routing loop.

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