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What is Route Poisoning and split horizon in eigrp?

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Question added by Zabi Syed , Network Engineer , VCS Pvt Ltd
Date Posted: 2014/09/04
ZUBAIR AHMED ANGADI SHAIK
by ZUBAIR AHMED ANGADI SHAIK , L1 Network Engineer , Will Way Solutions Pvt.Ltd

If a router changes the interface it uses to get to a destination, it momentarily turns off split horizon and commits route poisoning. Route poisoning is when the router, in order to stop other routers from using its old route/cost that it just changed, floods out route unreachable packets. This causes other routers to flush that old route out of their routing tables so that the new route can now be successfully added.

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