HI all,

in the past months I did some projects with PoE (PoE Splitter for powering Bosch Smart Home Controller, Philips Hue, Cromecast etc pp.

If classic PoE is activated it can be up to 12.95W/15.40W, PoE+ means  25.50W/30W.

https://en.wikipedia.org/wiki/Power_over_Ethernet

Mit freundlichem Gruß

Stadtwerke Norderstedt

Denis Klimek

Professional Network Engineer

IP-Systemtechnik

Tel:        040 / 521 04 – 1049

Mobil:    0151 / 652 219 06

dklimek@stadtwerke-norderstedt.de

www.stadtwerke-norderstedt.de

Von: observium [mailto:observium-bounces@observium.org] Im Auftrag von Adam Armstrong via observium
Gesendet: Freitag, 21. Juni 2019 02:39
An: James Tandy via observium
Cc: Adam Armstrong
Betreff: Re: [Observium] Confusing Poe+ Sensor alerts/warnings

These will just be getting the "default" sensor limits, which is measured +/- some amount. Probably not too useful for PoE. 

Since these sensors are from a POE-specic OID, we can hardcode the limits to anything we like, or disable them. Is there some standards-based limit, or should they not alert at all?

I'm not overly familiar with the requirements here.

adam.

Sent from Mailbird

On 2019-06-21 00:09:12, James Tandy via observium <observium@observium.org> wrote:

Hi,

Hardware: HPE J9780A Switch 2530-8-PoEP

Did some digging, thanks to the very helpful new? tool https://mibs.observium.org/mib/HP-ICF-POE-MIB/#hpicfPoePethPsePortPower

It appears the PoE Power warning is based on being over poe (not poe+) limits, not sure how it determines what the maximum allowed should be.
For PoE+ Switches it is 30W

The seemingly undocumented OID .1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16 gives the following output:

.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.1 = 1
.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.2 = 1
.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.3 = 2
.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.4 = 1
.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.5 = -1
.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.6 = 2
.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.7 = 1
.1.3.6.1.4.1.11.2.14.11.1.9.1.1.1.16.1.8 = -1

Ports 1,2,4 and 7 have PoE devices attached.
Ports 3 and 6 have PoE+ devices
and ports 4 and 8 are disconnected.

This table matches the 'PLC Type' column in the switch GUI.

Hopefully this could be useful in making more meaningful PoE Power status warnings/alerts.

Also not sure why Current causes an alert.. We have 3 of these switches, some of which show 0.22A as ok, while other ports alert as low as 94mA

-- 
Regards,
James Tandy
TandyUK Servers Limited
 
Tel: 01903 247 011
Www: http://www.tandyukservers.co.uk
Email: support@tandyukservers.co.uk
 
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