Frequently Asked Questions 

1. Based on what condition are interfaces listed as subinterfaces?

Subinterfaces are listed based on two criteria

1. When two or more IP Addresses have the same ifIndex in the same device. (You can check it in ipAdEntifIndex (.1.3.6.1.2.1.4.20.1.2) in RFC1213-MIB)
2. When two or more interfaces have the same IP address in the same device or different devices.

2. Why are interfaces not rediscovered in my device?

• Check whether the SNMP Credential is passed in the device.
• Check whether the ifTable returns an output in the MIB browser (Both Standalone and in OpManager)
• Check whether the SNMP service is running on the device
• Check whether the device is up and running at the moment.
• Check whether the SNMP port is blocked.

3. Why is there no data collection at my interfaces?

• Check whether the SNMP Credential is passed in the device.
• Check whether the ifTable returns an output in the MIB browser (Both Standalone and in OpManager)
• Check if the parent device is in down, unmanaged, or in the dependent unavailable status.
• Check if the interfaces are unmanaged
• Check if it is a subinterface
• Check if the interface has been decommissioned in environment or if the ifIndex is not valid.
• Check wheteher the interface counter has been changed from 32-bit to 64 bit.
• Check whether the Interface MIB has not been implemented in the device.
• Check whether the Interfaces have been moved to idle/disabled status by Data collection Manager (DCM)

Know more about the common data collection errors.

4. Why are the interface traffic values displayed as zero?

Check ifInOctects (.1.3.6.1.2.1.2.2.1.10) and ifOutOctects (.1.3.6.1.2.1.2.2.1.16) for the specified interface in the MIB Browser (RFC1213-MIB)

5. Why do traffic values differ from the real-time interface values in my interface graphs?

Traffic values are different in these Interface Graphs because, data collection happened at a different time. When you check real-time traffic during the interface's next poll, you may find that the real time traffic values and the interface graph values are the same.

6. Why is there no data in my interface related reports when there is data collection at my interfaces?

Interface related reports are based on an hourly table. You can check these reports after an hour from when these interfaces were added.