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Cisco Bug: CSCvi12717 - SNMP temperature precision readings on third party optics reporting incorrect values

Last Modified

Sep 16, 2019

Products (3)

  • Cisco Network Convergence System 5500 Series
  • Cisco Network Convergence System 5508
  • Cisco IOS XR Software

Known Affected Releases

6.1.4.BASE

Description (partial)

Symptom:
SNMP temperature precision readings on third party optics reporting incorrect values

SNMP walk for temperature sensors and its reporting incorrectly.

wbragg@str-tesla-02:~$ snmpwalk -v 2c -c t3s7La8 x.x.x.x 1.3.6.1.4.1.9.9.91.1.1.1 | grep 5800326
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.1.5800326 = INTEGER: 8
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.2.5800326 = INTEGER: 9
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.3.5800326 = INTEGER: 4 >>>>>
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.4.5800326 = INTEGER: 29675
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.5.5800326 = INTEGER: 1
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.6.5800326 = Timeticks: (0) 0:00:00.00
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.7.5800326 = INTEGER: 10
SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.8.5800326 = INTEGER: 5799937

the tool is reporting as 2.9675 C, however the precision level number is 4, hence its reporting as 2.9675 C

SNMPv2-SMI::enterprises.9.9.91.1.1.1.1.3.5800326 = INTEGER: 4 >>>>>

the issue is with the .3 OID, also known as entSensorPrecision.
In this case, with precision set to four, the sensor reading reported is 2.9675 Celsius, which is obviously incorrect.
The precision value should be set to 3, and the correct interpretation of the sensor reading should be 29.675 Celsius

Conditions:
N/A
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