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Question 215 - NCS-Core discussion

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A consultant is completing final network failover testing on a recently deployed AHV cluster.

The cluster consists of the following:

* Three nodes

* Two uplinks connected to two switches

* Supported SFPs

The consultant removed one SFP+ out of each node. Two of the nodes (Hostl I Host2) failed over to the backup NIC correctly without any interruption but have lost communication with the third node (Host 3) hypervisor/CVM. Inserting the original SFP+ back into the problematic node allowed the network to be connected and the two healthy nodes could communicate successfully again.

manage_ovs showjnterfaces output

manage_ovs showjinterfaces output:

name mode link speed

cthO 10000 True 10000

ethl 10000 False None

eth2 10000 True 10000

eth3 10000 False None

manage_ovs show.uplinks output:

Bridge: brO

Bond: brO-up

bond_mode: active-backup

interfaces: ethl ethO

lacp: off

lacp-fa I 1 back: false

lacp_speed: slow

What should the consultant validate first?

A.
Validate NIC card on node is seated properly.
Answers
A.
Validate NIC card on node is seated properly.
B.
Validate that the correct interfaces are included in the bridge.
Answers
B.
Validate that the correct interfaces are included in the bridge.
C.
Validate the customer has configured all their switch ports identically.
Answers
C.
Validate the customer has configured all their switch ports identically.
D.
Validate the SFP+ is fully plugged into the node and switch.
Answers
D.
Validate the SFP+ is fully plugged into the node and switch.
Suggested answer: D

Explanation:

Given the symptoms where two nodes correctly failover but lose communication with the third node after an SFP+ is removed, the first action should be to:

Validate the SFP+ is fully plugged into the node and switch: This is critical because a loose or partially connected SFP+ can cause intermittent network issues, which seems to be the problem based on the scenario described.

Nutanix Bible (https://www.nutanixbible.com), particularly the network troubleshooting sections.

Nutanix Field Installation Guide, which provides detailed steps on how to ensure hardware components like SFPs are correctly installed.

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asked 23/09/2024
Neftali Baez-Feliciano
31 questions
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