This document specifies the data export format for Cisco Systems' NetFlow services version 9, designed for use by network elements and collectors. The format uses templates to provide flexible and extensible access to observations of IP packet flows. Templates define fields and their semantics, allowing new fields to be added without changing the export format. The document covers the high-level process on the exporter, including flow expiration and transport protocol considerations. It details the packet layout, including the header, template flow set, data flow set, and options. The collector side is also described, along with security considerations and examples of export packets. The document aims to facilitate interoperability across different platforms and vendors.This document specifies the data export format for Cisco Systems' NetFlow services version 9, designed for use by network elements and collectors. The format uses templates to provide flexible and extensible access to observations of IP packet flows. Templates define fields and their semantics, allowing new fields to be added without changing the export format. The document covers the high-level process on the exporter, including flow expiration and transport protocol considerations. It details the packet layout, including the header, template flow set, data flow set, and options. The collector side is also described, along with security considerations and examples of export packets. The document aims to facilitate interoperability across different platforms and vendors.