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Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of 200. Router R3 advertises the prefix 192.168.1.0/27 to routers R5 and R6.
Assuming that none of the routers in AS 65540 is configured with "advertise-external", what is the expected output of "show router bgp routes" on router R5?
Suggested Answer: C
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32 comments · newest first
SA
Sarah
11 months ago
I think Option C might be right too, not so sure about A.
MO
Monroe
11 months ago
Option A is definitely the expected output here.
LA
Lanie
11 months ago
Wait, are we sure R3's prefix will even show up on R5?
CO
Coleen
11 months ago
Totally agree, that will affect route selection!
ED
Edgar
12 months ago
R5 has a local preference of 200 for its prefixes.
EL
Elvis
12 months ago
I believe the prefixes from R3 should show up on R5, but I'm not entirely clear on the specifics of the output format.
DA
Dalene
1 year ago
I feel a bit confused about the "advertise-external" setting. Does it mean we won't see external routes in R5's output?
JO
Joni
1 year ago
I think we practiced a similar question where we had to determine the output based on local preference and AS path. I hope that helps!
LE
Leonardo
1 year ago
I remember something about local preference affecting route selection, but I'm not sure how it interacts with route reflectors.
ST
Stephaine
1 year ago
I'm feeling pretty confident about this. Based on the information provided, I believe the expected output on R5 should be the prefixes from R5 with a local preference of 200, since those will be the most preferred routes.
FR
Freeman
1 year ago
I'm not entirely sure about this one. The question mentions "advertise-external", but I'm not sure how that impacts the outcome. I'll need to review the BGP concepts around route reflection and path selection.
JO
Josphine
1 year ago
Okay, I think I've got this. Since R5 is a client of the route reflector R1, it should receive the best path from R1. And since the prefixes from R5 have a higher local preference, those should be preferred over the route from R3.
YO
Yolando
1 year ago
Hmm, I'm a bit confused by the route reflector setup and the local preference values. I'll need to think through how the BGP decision process works in this scenario.
AL
Alba
1 year ago
This looks like a tricky BGP routing question. I'll need to carefully review the network topology and configuration details to determine the expected output on R5.
KR
Kristeen
2 years ago
I'm feeling pretty confident about this one. Option C all the way! Though I do wonder if the test maker has a sense of humor - maybe they'll throw in a joke about routers having a 'local preference' for their favorite sports teams or something.
SH
Sharan
2 years ago
Option C is the way to go, no doubt about it. I mean, come on, who doesn't know that local preference trumps everything else in BGP?
HA
Haley
2 years ago
Haha, I bet the test creator is trying to trick us with this one. But I've got my money on Option C - can't fool me!
AL
Alex
2 years ago
Let's see, maybe we should review the question again.
HE
Hester
2 years ago
I'm not so sure, I think it might be Option B.
MA
Marshall
2 years ago
I think Option C is the correct choice too.
FL
Florinda
2 years ago
Hmm, I'm not sure. The question mentions that none of the routers are configured with 'advertise-external', so I'm a bit confused. Maybe Option B is the right answer?
DE
Desirae
2 years ago
User1: Let's go with Option B then, it seems to be the most likely answer.
RE
Reita
2 years ago
User2: I agree, Option B seems like the most logical choice based on the information given.
PE
Peggie
2 years ago
I think Option B is correct because the question specifies that 'advertise-external' is not configured.
DO
Dorinda
2 years ago
That's a good point, the local preference could definitely impact the output. Option C might be the correct answer.
JU
Junita
2 years ago
I disagree, I believe it would be Option C because of the local preference set by router R5.
MA
Mabelle
2 years ago
Option C is definitely the correct answer. The local preference of 200 on the prefixes advertised by R5 means that R5 will prefer its own routes over the ones received from R3.
CA
Carmelina
2 years ago
That's right, Option C is the expected output on router R5.
JA
Jacklyn
2 years ago
So, R5 will choose its own routes over the one advertised by R3.
CR
Cristen
2 years ago
Yes, the local preference of 200 on R5's prefixes will make it prefer its own routes.
GL
Glynda
2 years ago
I think Option C is the correct answer.
DO
Dorinda
2 years ago
I think the expected output on router R5 would be Option A.