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Poison reverse is another way of avoiding routing loops. Once you learn of a route through an interface, advertise it as unreachable back through that same interface.

Once a router discovers it has lost contact with a neighboring router, it will immediately forward a routing update with the inoperable route metric set to infinity. Additionally, the router will broadcast the route with an infinite metric.

LSA are used to reliably flood link-state advertisement packets. LSA is sent to all routers in the OSPF area to signal a change in topology. This causes all routers to recalculate all of their routes using the Djikstra (SPF) algorithm.

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