Hi, as far as i can see: there are two kinds of possible reasons that corrupt the communication between R3 and R5, physical and logical. if it is physical , R3 can detect it immediately, at the time ,maybe it will get a route from R2 telling a route to R5, so , R3 step into holddown, R2 can not get any update about Route to R5 from R3,until time's up for its Invalid timer, so R2 will come to holddown status,then finnaly R3 can get correct route information to R5,in fact it's none! . the same conditon will comes to R1 and R2 ..... it's same for a logical corrupt......
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