A device is able to be discovered as Pingable but not as an SNMP managed device. It may also already be discovered, but now shows as "Management Lost" and is no longer polled for new data. What could cause this?
We can review Discovery Logging messages via the Data Aggregator (DA) DCDebug page. Access it via the URL:
If we see all responses from the target device show "REQUEST_TIMED_OUT" it indicates there is a problem with the device responding to the SNMP based Discovery requests sent to it by the Data Collector (DC) that should be managing the device.
All supported Performance Management releases
To validate whether the issue is product or environmental, we can run a simple test with an independent tool like snmpget on the CLI of the DC to see if the response is different. A sample command for SNMPv2c would be:
The command should return a valid response with the devices system up time value.
For additional details about the snmpget command usage run "man snmpget".
If the system does not have snmpget installed, it's a common free tool easily installed and very useful for SNMP troubleshooting. The command to install the package of utilities with snmpget is: