This means that the bandwidth NetFlow exports consume about 0.2%. The content of the communication is not stored, therefore the achievable aggregation rate is about 500:1 as compared to storing full packet traces. Flow statistics are created as an aggregation of the network traffic that contains basic 元/L4 telemetry data from IP header such as IP, port or protocol or Type of Service. NetFlow data extracted from routers or switches is an abstraction of the network traffic itself. It is usually necessary to test if it does – older nodes can sometimes suffer from performance issues, do not provide precise statistics or have limited scope for monitored network traffic characteristics.
It is always important to check the router/switch documentation to ensure it supports NetFlow and if so which version. This approach is used to overcome various performance and feature limitations of router-based NetFlow monitoring. The probes are transparently connected to the monitored network as passive appliances, creating a precise and detailed flow of statistics from the copy of network traffic. NetFlow statistics are provided by network elements (routers, switches) or by specialised standalone hardware probes.
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