This article explains why J-Flow/IPFIX export fails when the configured flow collector is reachable only through the management interface (e.g., fxp0 / mgmt_junos).

No J-Flow/IPFIX records received by the collector

Templates and flow records are not exported

Collector reachability works via the management interface (ping/SSH successful), but no flow data is seen

Ensure that the flow collector is reachable via a data plane (front-panel/forwarding) interface instead of the management interface.

• J-Flow/IPFIX export is performed in the data plane (FPC/PFE)
• Management interfaces belong to the control plane (Routing Engine) and are not part of forwarding
• Exporting flow data via the management interface is unsupported