Discuss Cisco 300-540 Exam Topic 2 Question 10

Refer to the exhibit.

Refer to the exhibit. An engineer is troubleshooting an issue where switch LEAF-SW-1 and switch LEAF-SW-2 receive corrupted forwarding and learning information about each other. LEAF-SW-1 and LEAF-SW-2 are configured with BGP EVPN VTEP. Which action resolves the issue?

A. On each switch, run the delete suppress-arp command against interface nve1. B. On each switch, configure a different secondary IP address against interface loopback0. C. On LEAF-SW-1, run the host-reachability protocol bgp command against interface nve1. D. On each switch, ensure the same BGP router ID is configured.

Suggested Answer:

In a VXLAN BGP EVPN fabric, each VTEP (NVE interface) must use BGP EVPN as the host-reachability protocol so that MAC/IP information and VTEP reachability are exchanged through the control plane.

From the exhibit:

LEAF-SW-1 -- interface nve1

source-interface loopback0

No host-reachability protocol bgp

Host Learning Mode: Data-Plane in show nve interface

LEAF-SW-2 -- interface nve1

source-interface loopback0

host-reachability protocol bgp configured

This mismatch causes one VTEP to rely on data-plane flood-and-learn, while the other uses EVPN BGP control-plane learning, leading to inconsistent and ''corrupted'' MAC/IP and ARP/ND information between the leaf switches.

The fix is to configure LEAF-SW-1 to also use BGP for host reachability:

interface nve1

host-reachability protocol bgp

Options B and D are incorrect because anycast VTEP designs intentionally share the same primary loopback IP while using different secondary IPs and unique BGP router IDs. Option A (removing suppress-arp) does not correct the control-plane mismatch.

Therefore, enabling host-reachability protocol bgp on LEAF-SW-1 (Option C) resolves the issue.

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23 comments · newest first

Tamekia 17 days ago

True, but if the router IDs are mismatched, it could lead to bigger problems.

Flo 22 days ago

But if the ARP is corrupted, wouldn't fixing that help first?

Lavonda 27 days ago

Exactly! Without the same router ID, issues will persist.

Beth 1 month ago

Right, consistency is key in BGP setups.

Tamekia 1 month ago

A is a good choice too, but I still think D is safer overall.

Flo 1 month ago

I'm leaning towards A. Deleting suppress-arp could clear up the corruption.

Lavonda 2 months ago

I agree, D seems logical. Same BGP router ID helps with consistency.

Beth 2 months ago

This question is tricky. I think option D makes sense.

Benton 2 months ago

I doubt B will fix it. The router ID consistency is key.

Shonda 2 months ago

I’m leaning towards B. Different IPs might resolve conflicts.

Gussie 2 months ago

But if the router IDs are different, it won't work anyway. D is solid.

Cassi 2 months ago

I feel like option A could help too. Deleting ARP might clear the corruption.

Aleisha 3 months ago

I agree, same BGP router ID is crucial for stability.

Rodrigo 3 months ago

This question is tricky. I think option D is the best choice.

Florinda 3 months ago

I've seen issues like this before, and option C worked for me.

Denny 3 months ago

Isn't option B just overcomplicating things?

Trina 3 months ago

Wow, I didn't realize the router ID had such an impact!

Chau 3 months ago

I disagree, I think option A could be the solution here.

Tonette 4 months ago

Option D seems like the right fix. Same BGP router ID is crucial!

Sharmaine 4 months ago

I’m leaning towards option C because I remember discussing host reachability protocols in class, but I’m not completely confident about its application in this case.

Vernice 5 months ago

I feel like the delete suppress-arp command could help, but I can't recall the exact scenario where we used it.

Frank 6 months ago

I think we practiced a similar question where the router IDs were mismatched, and it caused problems. Maybe option D is the right choice?

Olen 6 months ago

I remember something about BGP router IDs being crucial for establishing neighbor relationships, but I'm not entirely sure if that's the main issue here.

Cisco 300-540 Exam - Topic 2 Question 10 Discussion