IP / Network Issue

HPE Aruba switch: ARP poisoning / spoofing detected

Q: Where can I find the HPE Aruba official documentation?

https://community.arubanetworks.com/ — search the product family + feature name.

By Sai Kiran Pandrala · reviewed by Sai Kiran Pandrala, Editor Last verified: 2026-05-30

⚡ At a glance

Vendor	HPE Aruba
Operating system	ArubaOS-CX
Category	IP / Network Issue
Skill level	Intermediate to advanced
DIY-able?	Yes with CLI access; some scenarios need Aruba TAC + RMA.

What this guide covers

Fix ARP poisoning / spoofing detected on a HPE Aruba switch.

Step-by-step

Identify the offending source MAC via debug or capture.
Enable DHCP snooping + Dynamic ARP Inspection on access VLANs.
Mark uplinks as trusted; untrusted ports rate-limit + validate.
Monitor inspection statistics for repeat attacks.

CLI / commands

show interface brief
show interface 1/1/1
show system

When the issue persists

Open a Aruba TAC case with the tech-support bundle.
Provide the timeline + recent changes.

Frequently asked questions

Will this work on my specific ArubaOS-CX version?

The procedure reflects current ArubaOS-CX behaviour. Older releases may need minor syntax adjustments, use the CLI help (? or tab-completion) to verify.

Should I open a Aruba TAC case immediately?

Open one if you suspect hardware failure or the symptom persists after a maintenance-window reload. Make sure your support entitlement is active first.

Where can I find the HPE Aruba official documentation?

https://community.arubanetworks.com/: search the product family + feature name.

Is this procedure safe in production?

Test in a lab or maintenance window first. Capture pre-change state so you can roll back.

All HPE Aruba fix guides → /hpe/
All vendor guides → /vendors/

Related guides worth a look while you sort this one out:

References

HPE Aruba support portal: https://www.arubanetworks.com/support-services/
HPE Aruba knowledge base: https://community.arubanetworks.com/
HPE Aruba security advisories: https://www.arubanetworks.com/support-services/security-bulletins/
Open a case: https://asp.arubanetworks.com/

Reference material, not professional advice. Validate against your specific ArubaOS-CX version and test in a non-production environment before applying.

Common patterns we see

When this symptom shows up on a HPE device, three patterns repeat:

1. Recent firmware update changed behavior, the symptom started within a week of an OTA push. Rollback or wait for the hotfix. 2. Environmental trigger. temperature, humidity, line voltage, network changes. Look at what changed in the environment. 3. Cumulative wear, components like batteries, gaskets, fans degrade over time. Replace the consumable rather than chasing a software fix.

Knowing which pattern applies saves time on the wrong fix.

Before you start

A few things to confirm so the HPE device fix goes cleanly:

Latest firmware downloaded if you're going to update.
Warranty + support contract status checked: opening sealed parts may void it.
Backup of current configuration (where applicable) taken.
Spare parts on hand if you anticipate replacement.
Adequate workspace, lighting, and time, rushing causes regressions.

Verification checklist

After applying the fix on your HPE device, confirm:

The original symptom is no longer reproducible.
Related features (status LEDs, app sync, paired accessories) still work.
The device responds to a soft reboot without the fault returning.
Any error codes that were on display have cleared.
Documentation (your service log, the brand companion app) reflects the change.

When to call HPE support instead

Escalate if:

The same symptom returns within 24 hours of a clean fix.
You see physical damage (burn marks, swollen battery, cracked PCB).
The device is in warranty and a hardware replacement is the cheaper outcome.
Repair requires specialised tools you don't own (alignment jigs, calibration software).
Following the official path keeps the warranty intact, which matters more than the time spent.