Troubleshooting Tip: FortiGate interface utilization is not displayed in Zabbix SNMP server

The issue occurs when the SNMP community and polled interface IP are not aligned with the same VDOM, resulting in the IF-MIB interface table being empty and Zabbix receiving 'No Such Instance currently exists at this OID' responses.

Getting the following error message on the Zabbix SNMP server:

To resolve the issue of FortiGate SNMP interface utilization not showing in Zabbix, follow these steps:

• Ensure that the SNMP community and polled interface IP are aligned with the same VDOM. This can be done by configuring the SNMP community on the same VDOM as the interface being polled.
• Verify and use the correct OIDs for interface traffic.
• Restart the SNMP daemon.

Gracefully restart snmpd:

diagnose test application snmpd 99

Alternatively, forcefully restart snmpd:

diagnose sys process pidof snmpd  <----- It will return the process ID of snmpd to use.
diagnose sys kill 11 <pid#>

In case, if there are multiple process IDs running for the same process, use the following command to kill the process:

fnsysctl killall snmpd

Note: Download both FortiGate MIB files from the SNMP section. After downloading the MIB files, search within them for the interface state OID. For more information, refer to Technical Tip: The correct OID to monitor each interface state.