How to form loop in Rip?and how to avoid the loop?

Answer Posted / gpreddy

Three Methods to avoid Routing loops..
1)Split horizon: A Route learned through an interface is
never advertise back out of the same interface.
2)Poison Reverse or Route Poison:Route is marked as 16 hops
and infroms unreachable.
3)Hold Down time:Router does not accept any update for a
invalid route for the period of 180sec.

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