The Flow Interface dialog presents the following information:

  • Interface. This field displays the interface name. The interface name can be modified, if needed.
  • SNMP Index. The number received with flow data used to initially identify an interface.
  • Type. The type of interface obtained when querying the flow source using SNMP.
  • Status. The interface status obtained when querying the flow source using SNMP.
  • Speed. The physical interface speed obtained when querying the source using SNMP.
  • Last Incoming. The last time flows were received entering this interface.
  • Last Outgoing. The last time flows were received leaving this interface.

Use the following checkboxes to enable/disable actions specific to the interface:

  • Collector flows for traffic discarded by the source (flows without output interface). Enable this option to collect traffic which entered the source through one of its interfaces, but did not leave the source, possibly due to traffic going to the source itself or traffic that was blocked by the source.
  • Collector flows for traffic generated by the source (flows without input interface). Enable this option to collect traffic which did not enter the source and had no input interface but left the source.
  • Discard traffic seen only on this interface. Enable this option to remove traffic not seen on any other interface. Note, traffic seen on only one interface is considered unusual because most traffic crosses a source entering on one interface and leaving on another. Additionally, while discarding unusual traffic is fine since it does not affect bandwidth, it may be interesting to collect for security purposes.
  • Use Translated endpoint information (Available on Cisco ASA doing NAT). Enable this option to allow selecting the internal or external IP addresses and ports.
  • Specify custom speed for this interface. Enable this option and use the controls provided to set the speed of incoming and outgoing traffic. This option is needed when the interface capability (or speed) is less than the physical speed of the interface. It is also needed when downloading and uploading speeds are different. Note, the interface speed is used to calculate utilization, traffic divided by speed as a percentage.

Click Save to retain any changes to the interface settings and close the Flow Interface dialog.