What do you understand about poison reverse in the context of BGP?

1.	What do you understand about poison reverse in the context of BGP?
Answer» Poison Reverse: The Poison Reverse algorithm is a widely used distance-vector routing algorithm. To solve the count-to-infinity problem, poison reverse is used. To put it another way, poison reverse is the INVERSE of the split horizon. Route advertisements that would be muted by split horizon are instead ADVERTISED at a distance of infinity with poison reverse. Poison reverse is a RIP (Routing Information Protocol) technique. When path information becomes INVALID, routers do not instantly remove it from the routing database; instead, they broadcast a hop-count of 16, which is an unreachable metric value. This increases the size of the routing table but aids in the elimination of loops. It can break any loop between NEIGHBOURING routers right away. The MAIN notion of poison reverse is to ensure that a path does not return to the same node if the network's cost has changed.

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