| Info |
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This article provides details about errors with SNMP values that result in increased usage percentages. |
| Status |
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| colour | Blue |
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| title | Applicable to all Checkmk versions |
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| Panel |
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| borderColor | black |
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| bgColor | #f8f8f8 |
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| title | Table of Contents |
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Problem
A POE-enabled network interface shows an 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 in pethMainPseConsumptionPower (1.3.6.1.2.1.105.1.3.1.1.4.1) is not output in watts:
| Code Block |
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| language | bash |
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| theme | Midnight |
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OMD[$SITEmysite]:~$ 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 Checkmk then uses these values to calculate the percentages:
| Code Block |
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| language | bash |
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| theme | Midnight |
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6000/1800 → 333% |
Those are then wrong, of course, because if your input data is faulty, the result of whatever your calculation you do will also be faulty as well.
Solution
As the bug lies within the SNMP implementation of the affected device, the hardware vendor needs to must fix this bug in the firmware.
Please open a ticket with the vendor and ask them to fix the bug.
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