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• 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 77 IPv6 NetStream system
NSC
NDA
NDE
NDE
As shown in Figure 77, the following procedure of IPv6 NetStream data collection and analysis occurs:
1. The NDE, that is the device configured with IPv6 NetStream, periodically delivers the collected
statistics to the NSC.
2. The NSC processes the statistics, and then sends the results to the NDA.
3. The NDA analyzes the statistics for accounting, network planning, and the like.
NOTE:
• This document focuses on the description and configuration of NDE.
• NSC and NDA are usually integrated into a NetStream server.
IPv6 NetStream key technologies
Flow aging
The flow aging in IPv6 NetStream is a means used by the NDE to export IPv6 NetStream data to the
NetStream server. IPv6 NetStream creates an IPv6 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 IPv6 NetStream version export format.
IPv6 NetStream data export
IPv6 NetStream traditional data export
IPv6 NetStream collects statistics of each flow and, when the entry timer expires, exports the data of each
entry to the NetStream server.
Though the data includes statistics of each flow, this method consumes more bandwidth and CPU, and
requires large cache size. In most cases, not the whole statistics are necessary for analysis.
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