HPE7-A07 practice question 10 of 15

Your customer added third-party USB dongles to the USB ports of their AOS 10 access points. The customer uses AP-615 and AP-635 Each AP is connected with a Cat 6A cable to a CX 6300F Class 4 PoE switch All APs are in the same group in HPE Aruba Networking Central and share the same configuration However, many of the dongles do not come up. Which option will solve this issue?

Full set: 70 questions
Answer options
A: Replace the Class a PoE switches with Class 6 PoE switches. Correct answer
B: Create two separate service profiles in the loT tab of the Central configuration settings.
C: Perform a "poe disable" followed by a "poe enable" for the switch ports which connect to the APs so that the APs reboot.
D: Move the AP-635 access points to a different group in Central to configure the dongles separately from the AP-615.
Correct Answer:
A. Replace the Class a PoE switches with Class 6 PoE switches.
Explanation

The issue stems from a power budget shortfall, specifically for the AP-635 access points. According to official documentation, when an AP-635 is powered by a single IEEE 802.3at (Class 4) PoE source, it operates in a power-restricted mode and disables the USB port to conserve energy. The AP-615, having a lower power draw, can operate its USB port on Class 4 PoE without issue. Since the customer's CX 6300F switches provide only Class 4 PoE, the AP-635 units cannot power the attached USB dongles. Upgrading the switches to provide Class 6 PoE (IEEE 802.3bt) would supply sufficient power for the AP-635s to operate without restrictions, thereby enabling the USB ports and resolving the issue.

Why Incorrect

B. Creating separate IoT service profiles is a software configuration change that does not address the underlying hardware power limitation causing the USB ports to be disabled.
C. Rebooting the APs by power-cycling the switch ports is a temporary action. The APs will simply re-negotiate the same insufficient Class 4 power and disable the USB ports again.
D. Moving APs to a different configuration group in Central does not change the physical power delivered by the switch, which is the root cause of the problem.

References

1. Aruba AP-630 Series Access Points Data Sheet, Page 5, "Power" section. It states: "When powered by 1x 802.3at (Class 4) POE and with the IPM feature disabled, the AP will disable the USB port." It also states: "When powered by DC, 802.3bt (Class 5) POE or 2x 802.3at (Class 4) POE, the AP will operate without restrictions." This confirms Class 4 is insufficient and Class 6 (a type of 802.3bt) is sufficient.

2. Aruba AP-610 Series Access Points Data Sheet, Page 4, "Power" section. It states: "When powered by DC or 802.3at (Class 4) POE, the AP will operate without restrictions." This confirms the AP-615 models are not the source of the issue on the existing Class 4 switches.

3. Aruba CX 6300 Switch Series Data Sheet, Page 4, "PoE and Power" table. This document details the PoE capabilities of the CX 6300 series, confirming that models can be limited to Class 4 PoE (up to 30W), while other models or configurations can support high-power Class 6 PoE (up to 60W). The scenario specifies the customer has Class 4 switches.

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