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A confederated AS is comprised of three members. One member is comprised of 4 routers, while the other two members are comprised of 3 routers each. Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?
Suggested Answer: D
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31 comments · newest first
LI
Lizbeth
10 months ago
I think it’s actually 15 sessions total.
AL
Alaine
10 months ago
So that’s 12 sessions for the first AS and 9 for the others, right?
FR
Freeman
11 months ago
I’m not sure about that, seems like it could be 14.
EL
Elza
11 months ago
Wait, I thought it would be less than that!
CE
Ceola
11 months ago
There are 4 routers in one AS and 3 in the others.
DO
Doug
11 months ago
I’m leaning towards option C, but I’m not completely confident. I need to double-check how the sessions are counted between the AS members.
MA
Martina
11 months ago
I feel like the total number of sessions might be higher than I expect because of the different router counts in each member AS.
CH
Chauncey
12 months ago
I think we did a similar question about BGP sessions in a full mesh setup. If I recall correctly, it involves some combination of the routers in each AS.
NA
Natalie
12 months ago
I remember we calculated BGP sessions in class, but I'm not sure how to apply it to a confederation with different AS sizes.
EL
Elbert
1 year ago
I think I've got it! The key is to calculate the number of sessions for each member AS and then add them up. For the 4-router AS, that's 6 sessions. For the two 3-router ASs, that's 3 sessions each. So the total is 6 + 3 + 3 = 12 sessions.
ER
Ernie
1 year ago
I'm a bit confused on how to calculate the total number of sessions. Is it just a matter of adding up the sessions for each member AS?
CH
Chanel
1 year ago
Okay, let me break this down step-by-step. We have 3 member ASs, with 4, 3, and 3 routers respectively. For full mesh iBGP, each router needs a session with every other router in the confederation.
CR
Crista
1 year ago
Hmm, this looks like a tricky one. I'll need to think through the full mesh iBGP concept and how that applies to the different-sized member ASs.
LU
Lucille
2 years ago
The answer is clearly C) 14. Anyone who thinks otherwise must be living in a parallel universe where BGP sessions defy the laws of mathematics. Just sayin'.
JU
Judy
1 year ago
Exactly, no need to overcomplicate it. C) 14 is the correct answer.
OR
Oren
1 year ago
So, 4 routers x 6 sessions + 3 routers x 6 sessions + 3 routers x 6 sessions = 14 sessions in total.
NI
Nichelle
1 year ago
Yeah, it's simple math. 4 routers in one member, 3 in the other two members. Full mesh iBGP requires 6 sessions per router.
TA
Tamie
1 year ago
I agree, the answer is definitely C) 14.
AD
Adelle
2 years ago
Hmm, this is a tough one. I'm going to go with B) 13 just to mix things up a bit. Who knows, maybe I'll get lucky!
AL
Alyssa
1 year ago
I agree with you, I also think it's A) 12.
CH
Chanel
1 year ago
I think the answer is A) 12.
MA
Marjory
2 years ago
Whoa, this is a tricky one! Let me see... Okay, I've got it - the answer is C) 14. Gotta love those BGP sessions, am I right?
DE
Della
2 years ago
Definitely C) 14. This is a classic confederation topology problem, and the math checks out. Nice try with the other options, though!
CH
Chaya
2 years ago
Because each router in the fully meshed member ASs needs to establish a session with every router in the other member ASs, so it's 4 routers x 3 routers + 3 routers x 3 routers = 12 + 9 = 21. But since iBGP sessions are not required within the same member AS, we subtract 7 (3 routers x 2 sessions) to get 14.
RO
Rodrigo
2 years ago
Why do you think it's 14?
CH
Chaya
2 years ago
I disagree, I believe the answer is C) 14.
EL
Elmira
2 years ago
I think the answer is C) 14. It makes sense since each member AS has a full mesh of iBGP sessions, and with three members, that's 9 sessions plus the 5 sessions between the members.
CA
Carissa
1 year ago
So, the total number of BGP sessions within the confederation is indeed 14.
LO
Lourdes
2 years ago
That's right, with three members and each having a full mesh, it adds up to 14 sessions.
SH
Shaunna
2 years ago
I agree, the answer is C) 14. Each member AS has a full mesh of iBGP sessions.
RO
Rodrigo
2 years ago
I think the answer is A) 12.