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Router R2 receives a route to 192.168.1.0/27 from router R4, and sets the local preference to 110. Router R1 receives a route to 192.168.1.0/27 from router R3, and sets the local preference to 80. Both ASs have a full iBGP mesh. What path does traffic destined to 192.168.1.0/27 take from router R1?
Suggested Answer: B
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26 comments · newest first
GE
Gerri
11 months ago
No way, R1-R3-R4-R8 is the right path!
LI
Ligia
11 months ago
Wait, I didn't realize local preference mattered that much!
NA
Natalie
11 months ago
I thought R1 would pick R3's route because it's closer.
AN
Annett
11 months ago
Definitely going through R2 since it has 110!
CH
Chu
12 months ago
R1 prefers the route with the higher local preference.
AJ
Aja
12 months ago
I think the answer is B, since R2 has a higher local preference than R3, but I’m not completely confident about the path taken.
SH
Shayne
1 year ago
I’m a bit confused about the full iBGP mesh concept. Does that mean R1 can see both routes equally?
LU
Ludivina
1 year ago
This reminds me of a practice question where we had to analyze iBGP routes. I think the higher local preference takes precedence, so R1 should prefer R4's route.
MA
Makeda
1 year ago
I remember something about local preference affecting path selection, but I'm not sure how it plays out with multiple routes.
AR
Arlyne
1 year ago
I'm confident I can solve this. The key is understanding that in a full iBGP mesh, the route with the highest local preference will be selected, even if it's a longer path. So the answer is B, R1-R2-R4-R8.
ST
Stacey
1 year ago
Okay, I think I've got this. The route with the higher local preference (110) from R2 should be preferred over the route with the lower local preference (80) from R3. So the traffic should take the path R1-R2-R4-R8.
LE
Leota
1 year ago
Hmm, I'm a bit unsure about this one. The local preference values are different, but I'm not sure how that affects the path selection. I'll need to think it through step-by-step.
CH
Chana
1 year ago
This looks like a BGP routing question. I'll need to carefully consider the local preference values and the full iBGP mesh to determine the best path.
SH
Shayne
2 years ago
Haha, D must be the 'long way around' option. I'm not falling for that one, I'm sticking with B.
BR
Brittni
1 year ago
User 2: Yeah, D does seem like the long way around.
EL
Elliot
1 year ago
User 1: I agree, B seems like the most direct path.
MI
Micheline
2 years ago
Hmm, this is a tricky one. I'm torn between B and C. Guess I'll have to break out the BGP decision process flowchart to be sure.
HE
Hermila
2 years ago
I'm not sure, but I think the traffic will go through R1-R3-R8.
JO
Jose
2 years ago
Wait, are you telling me that the path involves R3 twice? That's gotta be a trick question. I'm going with C, R1-R3-R4-R8.
GW
Gwen
2 years ago
I agree with Layla, because R4 has a higher local preference set by R2.
MA
Maia
2 years ago
I think the answer is B, R1-R2-R4-R8. The local preference set on the route from R4 is higher than the one from R3, so R1 will prefer the path through R2 and R4.
SH
Sheldon
1 year ago
Great, thanks for clarifying that. It's important to understand how local preference affects route selection.
JO
Johnna
1 year ago
So the traffic destined to 192.168.1.0/27 will take the path R1-R2-R4-R8.
PH
Phil
1 year ago
Yes, that's correct. R1 will choose the path with the higher local preference.
RU
Rusty
1 year ago
I agree with you, the local preference set on the route from R4 is higher so R1 will prefer the path through R2 and R4.
LA
Layla
2 years ago
I think the traffic will take path R1-R3-R4-R8.