207Configuring NetStreamOverviewNetStream is an accounting technology that provides statistics on a per-flow basis. An IPv4 flow isdefined by the following 7-tuple elements:• Destination IP address.• Source IP address.• Destination port number.• Source port number.• Protocol number.• ToS.• Inbound or outbound interface.NetStream architectureA typical NetStream system includes the following elements:• NetStream data exporter—A device configured with NetStream. The NDE provides the followingfunctions:{ Classifies traffic flows by using the 7-tuple elements.{ Collects data from the classified flows.{ Aggregates and exports the data to the NSC.• NetStream collector—A program running in an operation system. The NSC parses the packetsreceived from the NDEs, and saves the data to its database.• NetStream data analyzer—A network traffic analyzing tool. Based on the data in NSC, the NDAgenerates reports for traffic billing, network planning, and attack detection and monitoring. TheNDA can collect data from multiple NSCs. Typically, the NDA features a Web-based system foreasy operation.NSC and NDA are typically integrated into a NetStream server.H3C network devices act as NDEs in the NetStream system. This document focuses on NDEconfiguration.
