Flow Aging; Netstream Data Export - H3C SR6600-X Configuration Manual

Figure 64 NetStream system

Flow aging

NetStream uses flow aging to enable the NDE to export NetStream data to NetStream servers.
NetStream creates a NetStream entry for each flow for storing the flow statistics in the cache.
When the timer of the entry expires, the NDE performs the following operations:
• Exports the summarized data to NetStream servers in a NetStream export format.
Clears NetStream entry information in the cache.
•
For more information about flow aging types and configurations, see
aging."

NetStream data export

Traditional data export
Traditional NetStream collects and exports the statistics of each flow to NetStream servers.
This method consumes more bandwidth and CPU than the aggregation method, and it requires a large
cache size.
Aggregation data export
NetStream aggregation merges the flow statistics according to the aggregation criteria of an
aggregation mode, and it sends the summarized data to NetStream servers. The NetStream aggregation
data export uses less bandwidth than the traditional data export.
Table 12 lists the available aggregation modes. In each mode, the system merges statistics for multiple
flows into statistics for one aggregate flow if each aggregation criterion is of the same value. The system
records the statistics for the aggregate flow. These aggregation modes work independently and can take
effect concurrently.
208
"Configuring NetStream flow