Discuss Huawei H12-891_V1.0 Exam Topic 3 Question 84

In DU label advertisement mode, if the liberal label retention mode is used, the device reserves labels received from all the LDP peers regardless of whether the LDP peer is the optimal next hop for reaching the destination network.

ATRUE

BFALSE

Suggested Answer: A

In MPLS LDP (Label Distribution Protocol), label retention modes control how labels are stored in the Label Forwarding Information Base (LFIB).

DU Label Advertisement Mode (Downstream Unsolicited):

Labels are advertised to all LDP peers without a request.

The receiving router decides which label to use for forwarding.

Liberal vs. Conservative Label Retention:

Liberal Label Retention Mode (Correct Answer)

All received labels from all LDP peers are stored.

Even if a peer is not the optimal next hop, its label is retained.

Allows faster convergence during failures.

Conservative Label Retention Mode

Only the label from the best next-hop peer is stored.

Reduces memory usage but can slow down convergence in case of failure.

Reference from Huawei HCIE-Datacom Documentation:

Huawei MPLS LDP Configuration Guide -- Liberal vs. Conservative Label Retention

HCIE-Datacom Training Material -- Label Advertisement in MPLS Networks

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19 comments · newest first

Mable 12 days ago

FALSE is more efficient though. Why waste resources?

Sharen 18 days ago

TRUE seems safer for redundancy.

An 23 days ago

Exactly! Retaining all could prevent issues down the line.

Mozell 28 days ago

But what if the other labels are needed later?

Tien 1 month ago

I disagree, it's FALSE. Only optimal labels should be kept.

Rachael 1 month ago

I think it's TRUE. It makes sense to keep all labels.

Luisa 1 month ago

FALSE is the right choice. Efficiency is key in networking.

Eve 2 months ago

TRUE seems logical. Why waste resources on non-optimal paths?

Lai 2 months ago

I disagree, it's FALSE. Only optimal next hop should be reserved.

Val 2 months ago

I think it's TRUE. It makes sense for label retention.

Merlyn 2 months ago

This seems a bit inefficient, not sure I agree.

Patti 2 months ago

Sounds right, that's how label retention works.

Fernanda 2 months ago

Wait, really? I thought it only used the best next hop!

Erasmo 3 months ago

I disagree, it should only reserve optimal labels.

Katina 3 months ago

That's true, it keeps all labels from LDP peers.

Flo 3 months ago

I remember discussing label retention modes in class, and I think the answer is A, but I need to double-check my notes.

Craig 3 months ago

I'm leaning towards A because it makes sense that the device would keep labels from all peers, but I could be mixing it up with another concept.

Terry 3 months ago

I feel like I've seen a similar question before, and it was about how labels are managed. Could it be B?

Eleni 4 months ago

I think the answer might be A, but I'm not entirely sure. I remember something about label retention modes in LDP.

Huawei H12-891_V1.0 Exam - Topic 3 Question 84 Discussion