H3C Technologies H3C SR8800 - Manual (Page 150)

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• Version 5—Exports original statistics collected based on the 7-tuple elements. The packet format is
fixed and cannot be extended flexibly.
• Version 8—Supports NetStream aggregation data export. The packet formats are fixed and cannot
be extended flexibly.
• Version 9—The most flexible format. It allows users to define templates with different statistics fields.
The template-based feature provides support of different statistics, such as BGP next hop and MPLS
information.
NetStream sampling
NetStream sampling basically reflects the network traffic information by collecting statistics on fewer
packets. The reduced statistics to be transferred also bring down the impact on the router performance.
For more information about sampling, see the chapter “Configuring a sampler.”
NetStream configuration task list
Before you configure NetStream, determine the following proper configurations as needed:
• Make sure on which router you want to enable NetStream.
• If multiple service flows are passing the NDE, use an ACL or QoS policy to select the target data.
• If enormous traffic flows are on the network, configure NetStream sampling.
• Determine which export format is used for NetStream data export.
• Configure the timer for NetStream flow aging.
• To reduce the bandwidth consumption of NetStream data export, configure NetStream
aggregation.