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BFD V1 Solution slide 2 It's the same as every protocol you've seen, with the addition of the loop in the DOWN state as long as the neighbor is in UP state Thus forcing the neighbor to acknowledge the failure before advancing. This is sufficient to ensure both sides see the session failure. ISIS and OSPF have more or less the same state machine, except that they will advance directly from DOWN to UP without having ever sent a packet, thus depriving the neighbor of the knowledge of the flap - we can’t do that |