Trigger an alert if OID is not able to be polled

I'm trying to set up an alert to trigger if a static route is missing from a Cisco router. I'm able to get this information via SNMP and have created a custom poller for the OID of 1.3.6.1.2.1.4.24.4.1.4 + the IP address. Example using 1.3.6.1.2.1.4.24.4.1.4.2.2.2.2

IP-FORWARD-MIB::ipCidrRouteNextHop.2.2.2.2.255.255.255.255.0.10.125.249.250 = IpAddress: 10.125.249.250

This returns the static route information and the next hop information (10.125.249.250). Now if I test for a static route that is not configured (1.1.1.1) I get the following:

IP-FORWARD-MIB::ipCidrRouteNextHop.1.1.1.1 = No Such Instance currently exists at this OID

I need to be able to set up an alert so that in this example an email would be sent if 1.1.1.1 is not configured on the router. Is there a way to trigger an alert in this type of scenario?

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mrxinu

SolarWinds has a copy of the net-snmp binary snmpget.exe that you could wrap in a PowerShell script that tries the OID and then passes or fails depending on the outcome. That would require SAM, though. Do you have NPM only?

bhilgenkamp_botw

I do have SAM but was hoping to stay away from using scripts since the SNMP credentials would need to be stored in the script. If that's the only option so be it, but was hoping for a solution using a custom poller.

mrxinu

Are you creating individual GET pollers or a single GET TABLE that pulls the entire thing? If it's the former, you're going to run into this problem with the poller coming up empty when it's missing. If you're doing the latter then there's an opportunity to do something a little more dynamic with a custom SQL alert that would look at the current poller row IDs (the bits with the IP addresses in them) and determine if your 1.1.1.1 entry isn't there.

bhilgenkamp_botw

I'm using GET TABLE