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

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.
A) TRUE
B) FALSE

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

Actual exam question for Huawei's H12-891_V1.0 exam
Question #: 84
Topic #: 3
[All H12-891_V1.0 Questions]

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.

Show Suggested Answer Hide Answer
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


by Felix at Jun 28, 2026, 06:08 AM

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Eve
3 days ago
TRUE seems logical. Why waste resources on non-optimal paths?
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Lai
8 days ago
I disagree, it's FALSE. Only optimal next hop should be reserved.
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Val
13 days ago
I think it's TRUE. It makes sense for label retention.
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Merlyn
19 days ago
This seems a bit inefficient, not sure I agree.
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Patti
24 days ago
Sounds right, that's how label retention works.
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Fernanda
29 days ago
Wait, really? I thought it only used the best next hop!
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Erasmo
1 month ago
I disagree, it should only reserve optimal labels.
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Katina
1 month ago
That's true, it keeps all labels from LDP peers.
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Flo
1 month ago
I remember discussing label retention modes in class, and I think the answer is A, but I need to double-check my notes.
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Craig
2 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.
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Terry
2 months ago
I feel like I've seen a similar question before, and it was about how labels are managed. Could it be B?
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Eleni
2 months ago
I think the answer might be A, but I'm not entirely sure. I remember something about label retention modes in LDP.
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