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Suppose router A connects to destination D and to adjacent router B: D-----A-----B. A reports to B that it can reach D at cost 1,
Suppose router A connects to destination D and to adjacent router B: D-----A-----B. A reports to B that it can reach D at cost 1, and so B concludes it can reach D at cost 2 with next_hop = A. If the D----A link breaks, how does split horizon prevent a routing loop between A and B?
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