Poison Reverse Versus Hold-Downs - Routers Put Packets In A Pinch

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Poison Reverse is a feature in Distance-vector routing to avoid problems encountered in routing loops. That is, when a route goes down, the router “poisons” subsequent by marking these routes as unreachable. Hold-downs are router features which block incoming address updates or advertisements. That is, if a route or router fails, a destination router will mark this route as unreachable and start a hold-down timer.

The route cannot be updated until the hold-down timer expires.

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[tags]techtionary,poison reverse,distance-vector routing,hold-downs,destination router[/tags]