|Component||Checks & Agents|
|Title||Check_MK Discovery service: Contact SNMP devices for real if 'Perform a full SNMP scan' is enabled|
|Checkmk Edition||Checkmk Raw Edition (CRE)|
|Compatibility||Compatible - no manual interaction needed|
There are two options Perform a full SNMP scan always, detect new check types and Just rely on existing check files, detect new items only especially for SNMP devices in the ruleset Periodic service discovery. The idea behind the first option is contacting SNMP devices for real and possibly find new check types. This option had no effect since Checkmk version 1.5.0 and cached data was always used. The result was that the Check_MK Discovery service might not have found new check typs on SNMP devices.
Now if this option is set Checkmk really contacts SNMP devices and may find new check types and services.
Please note: The execution time of the Check_MK Discovery service may take more time as before on hosts with SNMP data sources. In this case you can increase the regular and retry check interval of this service using the ruleset Normal check interval for service checks and Retry check interval for service checks in order to prevent timeouts.