Netstream Key Technologies; Flow Aging - HP 5820X Switch Configuration Manual

• NSC
The NSC is usually a program running in Unix or Windows. It parses the packets sent from the NDE,
stores the statistics to the database for the NDA. The NSC gathers the data from multiple NDEs, then
filters and aggregates the total received data.
• NDA
The NDA is a network traffic analysis tool. It collects statistics from the NSC, and performs further process,
generates various types of reports for applications of traffic billing, network planning, and attack
detection and monitoring. Typically, the NDA features a Web-based system for users to easily obtain,
view, and gather the data.
Figure 72 NetStream system
NDE
NDE
As shown in Figure
The NDE, that is the device configured with NetStream, periodically delivers the collected statistics
1.
to the NSC.
The NSC processes the statistics, and then sends the results to the NDA.
2.
The NDA analyzes the statistics for accounting, network planning, and the like.
3.
NOTE:
This document focuses on the description and configuration of NDE.
•
NSC and NDA are usually integrated into a NetStream server.
•

NetStream key technologies

Flow aging

The flow aging in NetStream is a means used by the NDE to export NetStream data to the NetStream
server. NetStream creates a NetStream entry for each active flow in the cache of the NDE and each entry
stores the flow statistics, which will be later exported to the NetStream server. When the timer of an entry
expires, the NDE exports the summarized data to the NetStream server in a specified NetStream version
export format. For more information about flow aging types and configuration, see
NetStream flow
NSC
72, the following procedure of NetStream data collection and analysis occurs:
aging."
NDA
195
"Configuring