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Question 37 of 184
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Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
C works for R4, but not R5. Route reflects have to have a route to the destination to reflect it. They will only have a route when they are connected to the ebgp router (R2 & R4). After this the route will show *i in the show ibgp table and not forward. Poor design but the answer is A. C wouldn't be any different than the current setup that is more than one hop away.
Another fine example of Cisco getting you to choose the best option. Off the bat, you can eliminate A & B, since RR on an edge router (R1) is not recommended. We already know, from the question that D won't work. C is the best answer from the options provided.
I also confirmed solution "C" in the lab (CML). RR = R4 (it's clients = R1, R5, R8) and RR = R5 (it's client R2). R2's loopback has not been advertised to R4 and R8 (and vica versa) until R2 became the client of RR R5. In my lab, full reachability was achieved with R4 and R5 being RRs. (Maybe I am missing something as others stated that R4 would be enough as RR.)