I'd differ slightly.
>Flapping refers to a link going up and down.
Flapping occurs when a link repeatedly goes down, then up, then
down, etc... over a short period of time.
>
>Dampening is a BGP feature used to minimize the instablility caused by a
>flapping link. A route that is flapping receives a penalty of 1000 for each
>flap. When the accumulated penalty reaches a configurable limit, BGP
>suppresses advertisement of the route even if the route is up. The
>accumulated penalty is decremented by the half-life time. When the
>accumulated penalty is less than the reuse limit, the route is advertised
>again (if it is still up).
Dampening isn't BGP only. While I agree that BGP route flap
dampening is the only type that is substantially configurable, OSPF
does have a holddown timer that helps deal with flaps.
>Regards,
>
>David Wolsefer, CCIE #5858
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