[Source] Wikipedia, the free encyclopedia
Route poisoning is a way to prevent routing loops.
Distance-vector routing protocols use route poisoning to indicate to other routers that a route is no longer reachable and should be removed from their routing tables.
A variation of route poisoning is split horizon with poison reverse whereby a router sends updates with unreachable hop counts back to the sender for every route received to help prevent routing loops.
A route is considered unreachable if the hop count exceeds the maximum allowed. Route poisoning is a method of quickly removing outdated routing information from other router's routing tables by changing its hop count to be unreachable (higher than the maximum number of hops allowed) and sending a routing update.
In the case of the Routing Information Protocol (RIP), to perform route poisoning on a route its hop count is changed to 16, deeming it unreachable (sometimes referred to as an Infinite metric) and a routing update is sent.
Route poisoning is a way to prevent routing loops.
Distance-vector routing protocols use route poisoning to indicate to other routers that a route is no longer reachable and should be removed from their routing tables.
A variation of route poisoning is split horizon with poison reverse whereby a router sends updates with unreachable hop counts back to the sender for every route received to help prevent routing loops.
A route is considered unreachable if the hop count exceeds the maximum allowed. Route poisoning is a method of quickly removing outdated routing information from other router's routing tables by changing its hop count to be unreachable (higher than the maximum number of hops allowed) and sending a routing update.
In the case of the Routing Information Protocol (RIP), to perform route poisoning on a route its hop count is changed to 16, deeming it unreachable (sometimes referred to as an Infinite metric) and a routing update is sent.
Ethernet0 on GW_Router went down.When a router receives a route poisoning, it sends an update back to the router from which it received the route poisoning, this is called poison reverse. This is to ensure that all routers on a segment have received the poisoned route information.
The Router is poisoning the routes and multicasting the new path costs via Ethernet1.
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