Finding the right place for a Flows exporter depends on the traffic you want to examine.
Not all devices support exporting of flows data. Compared to SNMP, it is a fairly recent development, typically supported on higher-end equipment. The process of examining packet headers of passing data and storing, summarizing, and exporting the results is fairly resource-intensive.
Another approach to collecting and exporting flows data: mirror the traffic to a mirror or span port, and use a dedicated host to run a flows-exporter application to export flows data.
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