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An LDP tunnel is established on router R1 towards router R6. The link between routers R2 and R4 goes down. What will happen to the MPLS data traffic to router R6 IMMEDIATELY after the link goes down?
Suggested Answer: C
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37 comments · newest first
AR
Arlette
11 months ago
I thought labels from both next-hops would prevent data loss.
DE
Denae
11 months ago
Fast reroute on R2 should keep the traffic flowing, right?
BR
Brandon
11 months ago
Wait, are we sure about that? What if there's a backup path?
FR
Francoise
11 months ago
Definitely agree with option B on this one!
KR
Kris
12 months ago
I think MPLS traffic will be discarded until IGP finds a new path.
PR
Princess
12 months ago
I recall that fast reroute can help maintain traffic flow, so maybe option D is correct? But I need to think about how that interacts with the link going down.
NO
Nobuko
1 year ago
I think option C sounds right because if R1 has labels from both next-hops, it should still forward traffic, but I’m not completely confident.
AN
Anissa
1 year ago
This question feels similar to one we practiced where a link failure caused traffic rerouting. I think it might depend on whether there's a backup path.
GE
Georgeanna
1 year ago
I remember studying how LDP tunnels work, but I'm not sure if the traffic would be discarded immediately or if there would be some failover.
TA
Tamra
1 year ago
I'm not totally sure about this one. I'll need to think through the MPLS failover mechanisms and how they interact with the IGP. Hmm, this will require some careful analysis.
EZ
Ezekiel
1 year ago
Okay, let's see. The key here is understanding how MPLS reacts when a link goes down on the LDP tunnel path. I think I have a strategy to work through this.
BE
Beatriz
1 year ago
I'm a bit confused about how the LDP tunnel and IGP routing interact in this scenario. I'll need to review my MPLS knowledge.
AL
Alida
1 year ago
Hmm, this looks like a tricky MPLS question. I'll need to think through the MPLS behavior carefully here.
CH
Charlette
1 year ago
This seems straightforward - the MPLS traffic should be discarded until the IGP finds a new next-hop. I'm confident I can select the right answer.
MA
Maurine
1 year ago
Hmm, I'm a bit unsure about the OSPF protocol. I'll need to think through the key advantages to make sure I answer this correctly.
CR
Cristal
1 year ago
Ugh, I'm not too familiar with Cisco WSA configurations. Let me think this through step-by-step and see if I can figure out the right answer.
YO
Yolande
1 year ago
Wait, MPLS has backup dancers? I thought it was more like a one-man show, just labeling everything in sight!
EN
Enola
1 year ago
I guess MPLS data traffic has some backup plans after all!
MA
Maybelle
1 year ago
C) MPLS data traffic will not be discarded because router R1 received labels from both next-hops, routers R2 and R3.
HY
Hyun
1 year ago
A) MPLS data traffic will be discarded until the IGP finds a new next-hop to router R3.
KA
Katina
1 year ago
C is the answer, no doubt. It's like having a backup dancer in case your main one trips on stage. MPLS is the diva, and the labels are the backup dancers!
JA
Jamie
1 year ago
Exactly, it ensures that the traffic keeps flowing smoothly even if there are disruptions.
CE
Cecil
1 year ago
It's like a safety net in case something goes wrong with the primary path.
VA
Valda
1 year ago
I agree, having a backup path is crucial for MPLS traffic.
WI
Winfred
1 year ago
Hmm, I'm still a bit confused. Is there a way to test this in a lab environment? I'd love to see it in action.
TI
Tiffiny
1 year ago
Aha! I think C is the correct answer. If R1 received labels from both next-hops, it can continue forwarding traffic even if the link between R2 and R4 goes down.
SH
Sherman
1 year ago
I think D is the correct answer. Fast reroute capability on R2 should ensure that the MPLS data traffic is not discarded.
NA
Nan
1 year ago
But what if the link between R2 and R4 goes down? Will the traffic still be forwarded to R6?
BA
Barney
1 year ago
I agree, C seems like the correct answer. R1 having labels from both next-hops should help in forwarding traffic.
EU
Eulah
2 years ago
The answer seems to be C, but I'm not sure why. I need to understand how MPLS label distribution works in this scenario.
AN
Anastacia
1 year ago
That makes sense. So even if one link goes down, the traffic can still reach its destination through the other path.
MI
Micah
1 year ago
No, the MPLS data traffic will not be discarded because router R1 received labels from both next-hops, routers R2 and R3.
FL
Florinda
1 year ago
But what if the link between R2 and R4 goes down? Will the traffic still reach R6?
PA
Patria
1 year ago
I think the answer is C because router R1 received labels from both next-hops, routers R2 and R3.
XU
Xuan
2 years ago
But what if the standby secondary path is not configured?
ER
Erick
2 years ago
I disagree, I believe the answer is D.
XU
Xuan
2 years ago
I think the answer is B.