Question

A network engineer configured Flexible NetFlow with an IPFIX exporter on a Catalyst router to send flow data to a collector at 10.50.10.20. The flow monitor is applied to interface GigabitEthernet0/1 and 'show flow monitor FM-IPFIX cache' displays hundreds of active flows. However, the collector never receives any records. Running 'show flow exporter EXP-IPFIX statistics' shows the 'Packets added' counter incrementing but 'Packets sent' remains at 0. What is the MOST likely cause?

Accepted Answer

The exporter is missing a 'transport udp <port>' statement, so exported datagrams are never built

Answer

The flow record uses 'match' fields instead of 'collect' fields, preventing export

Answer

The template timeout on the exporter is set higher than the flow active timeout

Answer

The flow monitor cache is in permanent mode, which disables export entirely