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Problem

A POE enabled network interface shows excessive usage percentage.
e.g. POE usage (6000W/1800W): : 333% (warn/crit at 90.0%/95.0%)

Reason

Some hardware vendors violate the SNMP RFC and output milliwatts instead of watts for pethMainPseConsumptionPower.

When looking at an SNMP walk of the affected device, it will become evident, that the value in pethMainPseConsumptionPower (1.3.6.1.2.1.105.1.3.1.1.4.1) is not output in watts:

OMD[$SITE]:~$ grep .1.3.6.1.2.1.105.1.3.1.1. ~/var/check_mk/snmpwalks/my_device
.1.3.6.1.2.1.105.1.3.1.1.2.1 1800
.1.3.6.1.2.1.105.1.3.1.1.3.1 1
.1.3.6.1.2.1.105.1.3.1.1.4.1 6000

These values are then used by Checkmk to calculate the percentages:

6000/1800 → 333%

Those are then wrong of course, because if your input data is faulty, the result of whatever calculation you do will be faulty as well.

Solution

As the bug lies within SNMP implementation of the affected device, the hardware vendor needs to fix this bug in the firmware.
Please open a ticket with the vendor and ask them to fix the bug.




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