Triggered updates
Well since we are discussing distance vector routing protocols, all routers will eventually converge, but updates are sent out every 30 seconds with a full routing table when things are operating normally. In the case of a failed interface the neighboring router would immediately send out and update, but it would only send out a poison route with a metric of 16. The router would also temporarily suspend split horizon and send out this poisoned route back in the direction it received an update. this would be called split horizon with poison reverse. As soon as the route is considered dead, the hold down timer starts and the routers will not believe any more information about the poisoned route until the hold expires.
Well since we are discussing distance vector routing protocols, all routers will eventually converge, but updates are sent out every 30 seconds with a full routing table when things are operating normally. In the case of a failed interface the neighboring router would immediately send out and update, but it would only send out a poison route with a metric of 16. The router would also temporarily suspend split horizon and send out this poisoned route back in the direction it received an update. this would be called split horizon with poison reverse. As soon as the route is considered dead, the hold down timer starts and the routers will not believe any more information about the poisoned route until the hold expires.
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