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NE40E V800R010C10SPC500 Feature Description - System Monitor 01

This is NE40E V800R010C10SPC500 Feature Description - System Monitor
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Aging of a Stream

Aging of a Stream

NetStream traffic on the network bursts intermittently. Tens of thousands of streams are generated in a few seconds. As the NDE memory capacity is limited, streams earlier saved on the NDE must be exported rapidly to release space. This process is called aging.

A stream is aged in any of the following situations:

  • Regular aging

    A stream is aged after its inactive time (from the time no packets are added to the stream to the current time) or its active time (from the time the stream is constructed to the current time) elapses. After the active time elapses, the system does not age the stream in the buffer until a new stream enters the buffer. After the inactive time elapses, the system immediately ages the stream, regardless of the active time of the stream.

    The active time is used to periodically export the long-lasting stream.

    The inactive time is used to export the stream to which packets are intermittently added. Once packets stop being added to the stream, the stream is exported to release memory space.

  • FIN-based or RST-based aging

    A stream is aged when the FIN or RST bit in a packet of a stream is detected.

    This is because the FIN or RST bit in the packet transmitted over a TCP connection indicates that the TCP connection is terminated. If a packet containing the FIN or RST bit enters is added to a stream, the system immediately ages the stream.

    By default, the system ages a stream that contains a packet carrying the FIN or RST bit. To collect statistics about packets carrying TCP flags, disable the system from aging a stream that contains a packet carrying the FIN or RST bit.

  • Bytes-based aging

    A stream is aged when the number of bytes exceeds the upper limit. Bytes of packets in the streams cached in the buffer are counted. The system therefore immediately ages the stream to avoid the byte counting error.

  • Forcible aging

    You can configure the device to forcibly age all original streams in the existing buffer. Forcible aging is used when the aging conditions are not met but new streams need to be added to the buffer or when the NetStream service becomes abnormal, causing streams in the buffer not to be aged.

Updated: 2019-01-03

Document ID: EDOC1100055050

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