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Huawei H12-891_V1.0 Exam - Topic 3 Question 73 Discussion

In MPLSVPN, in order to distinguish between IPv4 prefixes that use the same address space, the RD value is added to the IPv4 address, and the following options are described correctly as ?
B) On a PE device, each VPN instance corresponds to an RD value, and the RD value must be unique on the same PE device
A) RD can be used to control the publication of VPN routing information
C) RD is encapsulated in the Update message as an extended community attribute of BGP during delivery
D) After the PE receives an IPv4 route from CE, it adds an RD to the route to IPv4 that translates to a globally unique VPN-IPv4 route and publishes it on the public network

Huawei H12-891_V1.0 Exam - Topic 3 Question 73 Discussion

Actual exam question for Huawei's H12-891_V1.0 exam
Question #: 73
Topic #: 3
[All H12-891_V1.0 Questions]

In MPLSVPN, in order to distinguish between IPv4 prefixes that use the same address space, the RD value is added to the IPv4 address, and the following options are described correctly as ?

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Suggested Answer: B

by Floyd at Nov 19, 2025, 11:14 PM

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Carri
3 months ago
Overall, I lean towards D. It clarifies how PE handles routes.
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Brittney
3 months ago
C is interesting. Encapsulating RD in BGP helps with delivery.
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Lina
3 months ago
Option D makes sense too. Adding RD creates a unique route.
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Alex
4 months ago
Agreed! Without unique RDs, routing gets messy.
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King
4 months ago
I think option B is crucial. Each VPN needs a unique RD.
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Franklyn
4 months ago
I disagree with A, I think RD is more about identification than control.
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Cora
5 months ago
D) Wait, does the PE really add RD to the route? Sounds complicated!
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Jeanice
5 months ago
C) Yep, RD as an extended community in BGP makes sense.
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Willard
5 months ago
B) is correct, uniqueness is key for PE devices!
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Rodrigo
5 months ago
Hmm, I wonder if the exam will also ask about the difference between RD and RT. That's a tricky one!
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Phil
5 months ago
A) is not quite right. The RD is used to distinguish between IPv4 prefixes, not to control VPN routing information publication.
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Tijuana
5 months ago
B) is correct too. Each VPN instance on a PE device has a unique RD value.
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Wilson
6 months ago
C) is also correct. The RD is encapsulated in the BGP Update message as an extended community attribute.
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Ashleigh
6 months ago
D) is the correct answer. The RD is added to the IPv4 prefix to create a globally unique VPN-IPv4 route.
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Bambi
6 months ago
For the last option, I believe the PE adds the RD to the route, but I'm not clear on how it translates to a globally unique VPN-IPv4 route.
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Ozell
6 months ago
I practiced a question similar to this, and I recall that the RD is indeed encapsulated in the BGP Update message as an extended community attribute.
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Kristofer
6 months ago
Hmm, I'm not sure about the details of how the RD is used in the Update message. I'll need to double-check the BGP extended community attributes to make sure I understand that part correctly.
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Ciara
6 months ago
The key here is that the RD value is unique per VPN instance on the PE device. This allows the PE to differentiate between IPv4 prefixes that might overlap between different VPNs. I'm pretty confident I can identify the correct answer based on this understanding.
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Rashida
7 months ago
A) is spot on, RD really helps with routing control.
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Karma
7 months ago
I think each VPN instance does need a unique RD on the same PE device, but I might be mixing it up with other attributes.
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Pamela
7 months ago
I remember that the RD is crucial for distinguishing routes, but I'm not entirely sure if it controls the publication of routing info.
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Glory
7 months ago
I feel option A is important for controlling routing info.
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Laura
8 months ago
Okay, I think I've got this. The RD value is used to make the IPv4 prefix globally unique when it's advertised in the MPLS VPN network. The PE device adds the RD to the IPv4 prefix to create a VPN-IPv4 route that can be shared across the public network.
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Makeda
8 months ago
I'm a bit confused about the RD value and how it's used to distinguish between IPv4 prefixes. I'll need to review the MPLS VPN concepts again to make sure I understand this properly.
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Willie
2 months ago
And it gets added to the route before publishing, correct?
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Elsa
3 months ago
I think each PE device needs a unique RD for each VPN instance.
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Eun
3 months ago
Yes, it helps avoid conflicts in the same address space.
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Alba
3 months ago
RD is crucial for unique routing, right?
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Izetta
7 months ago
Exactly! It ensures the routes are globally unique.
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