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HPE7-A04 Exam - Topic 2 Question 17 Discussion

You are adding EVPN VXLAN to an L3 spine and leaf topology that uses OSPF for the underlay. You plan to use a single BGP AS. Which design for EVPN neighbors is correct?
C) At least one spine switch should act as route reflector and specify the leaf switches' unique loopback IPs as route reflector clients
A) Leaf switches should establish iBGP sessions with other leaf switches using their VXLAN loopback IPs. Route reflectors are not required
B) The border leaf switches should act as route reflectors and specify the leaf switches' VXLAN loopback IPs as route reflector clients
D) Leaf switches should establish iBGP sessions with spine switches on their actual P2P link IP addresses. Route reflectors are not required

HPE7-A04 Exam - Topic 2 Question 17 Discussion

Actual exam question for HP's HPE7-A04 exam
Question #: 17
Topic #: 2
[All HPE7-A04 Questions]

You are adding EVPN VXLAN to an L3 spine and leaf topology that uses OSPF for the underlay. You plan to use a single BGP AS. Which design for EVPN neighbors is correct?

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Suggested Answer: C

by Shelia at Jul 08, 2025, 02:15 PM

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Rusty
5 months ago
D is interesting, but I think it complicates things.
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Aracelis
6 months ago
I disagree, B makes more sense for scalability.
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Tracie
6 months ago
A is correct, no need for route reflectors.
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Jesusita
6 months ago
C seems off, why would a spine be a route reflector?
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Helene
6 months ago
Wait, are we really not using route reflectors at all?
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Geoffrey
7 months ago
I thought we learned that leafs should use their P2P link IPs for iBGP, but I’m a bit confused about the role of route reflectors in this setup.
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Susana
7 months ago
I feel like at least one spine acting as a route reflector makes sense, especially for scalability, but I can't remember if it was a requirement or just a recommendation.
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Marta
7 months ago
I think we practiced a similar question where the border leafs acted as route reflectors. It seems like a good design, but I can't recall if that's the only option.
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Amie
7 months ago
I remember discussing how leaf switches can directly establish iBGP sessions using their loopback IPs, but I'm not sure if route reflectors are really necessary in this case.
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Tamekia
7 months ago
This looks straightforward to me. The best approach is option A - the leaf switches should just establish iBGP sessions with each other using their VXLAN loopback IPs. No need for any route reflectors in this single BGP AS topology.
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Yoko
8 months ago
I'm a bit confused on the differences between the options here. Do the leaf switches need to use their VXLAN loopback IPs or their actual P2P link IPs for the BGP sessions? And when would you need route reflectors versus a full mesh? I'll have to review the EVPN design principles again.
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Latrice
8 months ago
Okay, I've seen this type of EVPN setup before. I believe the correct answer is C - using a spine switch as the route reflector and specifying the leaf switches' loopback IPs as the clients. That way you avoid full mesh iBGP between all the leaf switches.
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Lavera
8 months ago
Hmm, this one seems tricky. I'm not totally sure about the different options for the EVPN neighbor design. I'll have to think through the pros and cons of each choice carefully.
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Alonso
8 months ago
I think this question is testing our understanding of EVPN VXLAN design in an L3 spine-leaf topology. The key is figuring out the correct way to set up the BGP EVPN neighbor relationships.
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Willard
10 months ago
That's a good point, having a spine switch as route reflector can provide better scalability
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Merilyn
10 months ago
I think option C makes more sense, having a spine switch act as route reflector
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Tatum
10 months ago
But in option B, the border leaf switches should act as route reflectors, which might not be necessary
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Dong
10 months ago
I'm just picturing the poor sysadmin trying to keep track of all those VXLAN loopback IPs. Option C is the way to go, for sure.
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Karrie
10 months ago
It's important to streamline the process for the sysadmin. Option C will definitely make their job easier.
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Sueann
10 months ago
I agree, using a spine switch as a route reflector with leaf switches' unique loopback IPs as clients is the most efficient way to handle EVPN neighbors.
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Carole
10 months ago
Option C is definitely the best choice. It simplifies the configuration and makes management easier.
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Darell
11 months ago
Haha, option D? What is this, amateur hour? Route reflectors are a must-have in this scenario.
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Dorothy
10 months ago
C) At least one spine switch should act as route reflector and specify the leaf switches' unique loopback IPs as route reflector clients
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Chi
10 months ago
A) Leaf switches should establish iBGP sessions with other leaf switches using their VXLAN loopback IPs. Route reflectors are not required
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Willard
11 months ago
I disagree, I believe option B is the right choice
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Dan
11 months ago
I don't know, I'd probably go with option B. The border leaf switches can handle the route reflector duties, right?
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Marva
10 months ago
Exactly, it helps reduce complexity in the network architecture.
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Antonio
10 months ago
Yeah, I agree. It simplifies the design by having the border leaf switches handle the route reflector duties.
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Desiree
10 months ago
That makes sense. It simplifies the design by having the border leaf switches handle the route reflector duties.
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Flo
10 months ago
Option B sounds like the best choice. The border leaf switches can act as route reflectors for the leaf switches.
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Bulah
10 months ago
Option B is correct. The border leaf switches can act as route reflectors for the leaf switches.
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Tatum
11 months ago
I think the correct design is option A
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Valentin
11 months ago
Option C seems like the way to go. Having a spine switch as the route reflector just makes sense in this topology.
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Dong
11 months ago
Using the leaf switches' unique loopback IPs as route reflector clients also ensures a more efficient routing process.
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Alaine
11 months ago
It definitely helps with scalability and reduces the complexity of the configuration.
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Mozelle
11 months ago
I agree, having a spine switch as the route reflector simplifies the design.
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