topic PoE CW9166I-E in Wireless

PoE CW9166I-E

Moudar — Fri, 14 Feb 2025 14:21:07 GMT

Using the CW9166I-E APs with USB port enabled is 30,5 Watts. The switch shows 30 watts:

sh power in Module Available Used Remaining (Watts) (Watts) (Watts) ------ --------- -------- --------- 1 240.0 60.0 180.0 Interface Admin Oper Power Device Class Max (Watts) --------- ------ ---------- ------- ------------------- ----- ---- Gi1/0/1 auto off 0.0 n/a n/a 30.0 Gi1/0/2 auto off 0.0 n/a n/a 30.0 Gi1/0/3 auto off 0.0 n/a n/a 30.0 Gi1/0/4 auto on 30.0 CW9166I-E 4 30.0 Gi1/0/5 auto off 0.0 n/a n/a 30.0 Gi1/0/6 auto off 0.0 n/a n/a 30.0 Gi1/0/7 auto off 0.0 n/a n/a 30.0 Gi1/0/8 auto on 30.0 CW9166I-E 4 30.0 --------- ------ ---------- ---------- ---------- ------ ----- Totals: 2 on 60.0

Disabling the PoE port does not reduce power consumption to 25.5W as stated in the AP datasheet:

The switch still shows a power consumption of 30W. What's going on here?!

Re: PoE CW9166I-E

Scott Fella — Fri, 14 Feb 2025 14:36:33 GMT

I'll be honest, I only look at that for the required power. I don't think I have ever seen ap's actually show the min W that it shows on the datasheet. I have a mix of ap's and they are all over.

Re: PoE CW9166I-E

Moudar — Fri, 14 Feb 2025 14:56:58 GMT

I got a bunch of different APs that shows lower Watts.

Example: 9120 shows this with disabled USB port:

Gi1/0/37 auto on 23.2 C9120AXI-E 4 30.0

but it shows 30W if USB port is enabled!

Re: PoE CW9166I-E

Scott Fella — Fri, 14 Feb 2025 15:04:49 GMT

I see the same, even for Meraki ap's.... I wouldn't worry about it unless your budgeted using the lowest power and might run out of available PoE.

Re: PoE CW9166I-E

Leo Laohoo — Sun, 16 Feb 2025 03:04:07 GMT

~~Reboot the AP.~~

Re: PoE CW9166I-E

Rich R — Sat, 15 Feb 2025 19:22:31 GMT

We've had this argument with the BU and they do not understand - even our account team have given up trying to explain it to them. We now work out what the maximum required AP PoE power is (including cable loss) and statically configure the max power on the PoE port to prevent the APs from requesting full power regardless (which is what they do by default). The data sheet specifies the maximum consumed power but the APs still request full power anyway. If your power budget is tight then setting static max is the only way to prevent the AP from requesting full power regardless.

show power inline Gi1/0/37 detail

will show the actual power consumption which is inevitably much lower than what the AP has reserved and matches the data sheet requirement (+ cable loss depending on cable).

You'll usually need to add 5 to 10% to the datasheet number to ensure the AP still gets full power.

ps: you said "Disabling the PoE port" @Moudar - obviously meant to be "Disabling the USB port" <wink>

Re: PoE CW9166I-E

Leo Laohoo — Sun, 16 Feb 2025 03:04:27 GMT

Disable CDP on the switch and reboot the AP.

If this works, then this could be CSCwj60401.

Re: PoE CW9166I-E

Moudar — Mon, 17 Feb 2025 09:26:19 GMT

sh power in gigabitEthernet 1/0/4 detail Interface: Gi1/0/4 Inline Power Mode: auto Operational status (Alt-A,B): on Device Detected: yes Device Type: cisco CW9166I-E Connection Check: n/a IEEE Class (Alt-A,B): 4 Physical Assigned Class (Alt-A,B): 4 Discovery mechanism used/configured: Ieee and Cisco Police: off Power Allocated Admin Value: 30.0 Power drawn from the source: 30.0 Power available to the device: 30.0 Allocated Power (Alt-A,B): 30.0

Re: PoE CW9166I-E

Moudar — Mon, 17 Feb 2025 14:33:17 GMT

It looks like my case is the bug!

The switch is C9200CX-8P-2X2G and runs 17.12.04

Is there any way to fix that?

Re: PoE CW9166I-E

Mark Elsen — Mon, 17 Feb 2025 15:02:19 GMT

- @Moudar The particular bug report : https://quickview.cloudapps.cisco.com/quickview/bug/CSCwj60401
mentions Fixed Releases for the AP (not the switch) ,

Re: PoE CW9166I-E

Leo Laohoo — Tue, 18 Feb 2025 00:14:53 GMT

Raise a TAC Case and demand for an SMU.

Re: PoE CW9166I-E

Rich R — Wed, 19 Feb 2025 01:28:03 GMT

1. CSCwj60401 is about the AP not requesting enough power (only requesting POE+ 30W from a UPOE switch instead of UPOE 30.5W)
2. @Moudar is complaining about the AP requesting too much power (when USB disabled) 30W instead of 25.5W.
3. The switch is POE+ not UPOE so the AP cannot request more than 30W, so CSCwj60401 is not applicable in my opinion.
4. Since the fix for CSCwj60401 is in the AP code it would be in an APSP not a SMU, but given that it's already fixed in the released version of 17.15.2 I think it's unlikely to go into a 17.12.4 APSP at this point and more likely will just be included in the next 17.12 release (17.12.5) although just realised 17.12.4 is the switch IOS - what version is the WLC running @Moudar ? (remember to always provide WLC code version)

Re: PoE CW9166I-E

Moudar — Wed, 19 Feb 2025 09:49:21 GMT

WLC#sh ver Cisco IOS XE Software, Version 17.12.04 Cisco IOS Software [Dublin], C9800 Software (C9800_IOSXE-K9), Version 17.12.4, RELEASE SOFTWARE (fc3)

Re: PoE CW9166I-E

Rich R — Wed, 19 Feb 2025 11:01:15 GMT

Noted - so WLC is also 17.12.4. Obviously also make sure you have the 17.12.4 SMUs and latest APSP installed as per the TAC recommended link below.

Re: PoE CW9166I-E

Leo Laohoo — Mon, 24 Feb 2025 21:54:22 GMT

APSP8 (C9800-universalk9_wlc.17.12.04.CSCwn86874.SPA.apsp.bin, 31 January 2025) claims to fix this bug.

Re: PoE CW9166I-E

Rich R — Mon, 24 Feb 2025 22:56:50 GMT

Well APSP8 fixes CSCwj60401 but as I said above I'm not sure that bug is the right one based on the description. But, of course, it wouldn't be the first time the description on the bug is not accurate or it fixes other related issues which are not specifically mentioned ...

Hence my recommendation to make sure the latest SMUs and APSPs are installed with 17.12.4.