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BFD V1 Problem slide 2 Worse, if the two ends use different timers during session establishment (say, 1 sec on one end and 5 sec on the other) the deadlock scenario is guaranteed to happen repeatedly (unrecoverably.) If there is a unidirectional failure, the deadlock scenario is guaranteed to happen 50% of the time (depending on who gets their packet across first) with the timer expiring to get the one guy out of Init state; then the dice roll again. |