High cpu in monitoring because of SnmpSubagent andf SnmpMaster processes

[Frank_Veen]

Hi all,

Can anybody help explain why the snmpMaster and snmpSubagent processes are using a lot of cpu during snmp polls? Maybe misconfiguration?

Running image is 16.1.3.6-patch1-9

In our monitoring we see that every few minutes the cpu utilisation of one of our X440's is abnormal high. Our monitoring server uses snmp polls every minute to get the switch cpu utilization (among other things).

This is happening when there is almost no traffic even, for example during nights. See the image below the cpu utilization every few minutes around 40%:

Now the top command on the switch shows more info, clearly the SnmpMaster and SnmpSubagent are using a lot of CPU during the poll:

Kind regards,

Frank

[Jeremy_Gibbs]

Also, are you using SNMPv3? I have seen V2 on a large stack cause high CPU, because SNMPv2c and 1 are inefficient compared to V3.

[davidj_cogliane]

I have seen this happen when components the SNMP is polling are damaged. Are there any log messages? I have also seen this as the result of a misconfiguration. But can't remember the details of that, or how we corrected it.