How to monitor SNMP variables that return non-integer values?
By default you can monitor only SNMP variables that return integer values. Non-integer SNMP variables are disabled in SNMP browser for default Counter Type 'Current value' as for 'Delta' Counter Type. But IPHost Network Monitor allows monitoring of non-integer SNMP variables and provides two SNMP 'Counter Types' for this:
- Value has changed
- Value is allowed
So if you select one of these Counter Types you will be able to select any SNMP variable in the SNMP browser to monitor.
If you select 'Value has changed' Counter Type, IPHost Network Monitor compares result of current poll with result of previous poll and returns 0 if the results are equal and 1 if they differ.
If you select 'Value is allowed' Counter Type, IPHost Network Monitor compares result of current poll with values from the list of allowed values that you provided ('Allowed Values' row in the Property Editor) and returns 0 if the result is one of allowed values and returns 1 if not. Please note that you should enter allowed values in the same format as they are formatted in the SNMP browser.
Actual result of latest poll you can find in the Log View (Current value: 'result of poll'). Result of poll will be logged only if it differ from previous or monitor state change has occured.
You can set IPHost Network Monitor to alert you if monitor returns 1 (means value has changed or value is NOT allowed). You can use Performance Monitoring parameters for this. You can set Performance Warning (or Performance Problem) levels equal to 0 so monitor turns Performance Warning (or Performance Problem) state and performs alerts assosiated with the monitor. So you will be notified about the state change, also you can set IPHost Network Monitor to run any program or script on state change.
Of course you can also use 'Value has changed' and 'Value is allowed' Counter Types with integer SNMP variables the same way as non-integer SNMP variables.
