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Cisco Flexible Netflow configuration

Flexible Netflow is a Cisco IOS technology that allows you more freedom to collect exactly the type of information you want in the Netflow records. ¹⁾

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Cisco docs https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/flexible_netflow/configuration_guide/b_fnf_3se_3850_cg/b_fnf_3se_3850_cg_chapter_010.html