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NE40E V800R010C10SPC500 Feature Description - System Monitor 01

This is NE40E V800R010C10SPC500 Feature Description - System Monitor
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Understanding NetStream

Understanding NetStream

The implementation of the NetStream function is as follows:
  1. Packet sampling

    Packets are replicated and sent to a NetStream board.

  2. Stream processing

    Streams are constructed, maintained, aged, aggregated, and added to packets for export.

NetStream service processing modes are as follows:
  • Integrated service processing mode

    Packet sampling is performed on an interface board, and stream processing is performed on a NetStream board. Each interface board samples and sends packets to the NetStream board for integrated processing.

  • Distributed service processing mode

    Packet sampling and stream processing are performed on an interface board.

The process of sampling packets is as follows:
  1. After the NetStream function is enabled on an interface, the system stores NetStream information in the interface information table.

  2. The system samples packets passing through the interface at a configured sampling ratio.

The interface board replicates the sampled packets and sends them to the NetStream board for processing.

After receiving a packet, the NetStream board extracts packet attributes (such as source address and destination address) and compares them with those of existing streams created from packets. If the attributes match, the packet is added to the stream, and the packet count is refreshed. If the received attribute does not match the local one, a new stream is created. Then, the NetStream board ages and aggregates streams and sends the statistics to the specified network management system (NMS) for analysis.

If a great number of packets are sampled, the forwarding performance of the device is affected. The recommended sampling ratio is 1000:1.

Updated: 2019-01-03

Document ID: EDOC1100055050

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