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miguel.ercolino
Beginner

SNMP IP Sla Jitter min and max calculation

I am trying to poll the min and max source to destination and destination to source IP Sla statistics from some Cisco devices.  I am using the following OID's:

 

.1.3.6.1.4.1.9.9.42.1.5.2.1.6 --> rttMonLatestJitterOperMinOfPositivesSD

.1.3.6.1.4.1.9.9.42.1.5.2.1.7 --> rttMonLatestJitterOperMaxOfPositivesSD

.1.3.6.1.4.1.9.9.42.1.5.2.1.11 --> rttMonLatestJitterOperMinOfPositivesSD

.1.3.6.1.4.1.9.9.42.1.5.2.1.12 --> rttMonLatestJitterOperMaxOfPositivesSD

 

.1.3.6.1.4.1.9.9.42.1.5.2.1.16 --> rttMonLatestJitterOperMinOfPositivesSD

.1.3.6.1.4.1.9.9.42.1.5.2.1.17 --> rttMonLatestJitterOperMaxOfPositivesSD

.1.3.6.1.4.1.9.9.42.1.5.2.1.21 --> rttMonLatestJitterOperMinOfPositivesSD

.1.3.6.1.4.1.9.9.42.1.5.2.1.22 --> rttMonLatestJitterOperMaxOfPositivesSD

 

How can  I calculate the min jitter and max jitter as reported by the device on the "sh ip sla statistics" otuput?

 

---------------

Jitter Time:
Number of SD Jitter Samples: 9
Number of DS Jitter Samples: 9
Source to Destination Jitter Min/Avg/Max: 0/2/3 milliseconds
Destination to Source Jitter Min/Avg/Max: 0/1/1 milliseconds

---------------

 

I supposed that the min jitter should be the min value between rttMonLatestJitterOperMinOfPositivesSD and rttMonLatestJitterOperMinOfPositivesSD and for the max jitter should be the max between rttMonLatestJitterOperMaxOfPositivesSD and rttMonLatestJitterOperMaxOfPositivesSD

 

But it does not match, usually I have problems with the min calculation, usually when the output report that the min is 0, the snmp reports that is 1 ms. For example:

 

When I poll the device for ip sla and using the above method of calculation this are the results:

 

Source to Destination Latency one way Min/Avg/Max: 1/1/1 milliseconds
Destination to Source Jitter Min/Avg/Max: 1/1/1 milliseconds

 

and the output of the show command report this:


Source to Destination Jitter Min/Avg/Max: 0/1/1 milliseconds

Destination to Source Jitter Min/Avg/Max: 0/1/1 milliseconds

 

 

Am I missing something? or there is any other way to calculate this?

1 REPLY 1
ABrandt
Beginner

Anyone solved that problem in meantime?

I've exaclty the same problem - I need the min/max value to provide perfdata to Icinga...

 

best regards