H3C Technologies H3C SR8800 - Manual (Page 166)

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IPv6 NetStream operation
A typical IPv6 NetStream system comprises three parts: NetStream data exporter (NDE), NetStream
collector (NSC), and NetStream data analyzer (NDA).
• NDE
The NDE analyzes traffic flows that pass through it, collects necessary data from the target flows,
and exports the data to the NSC. Before exporting data, the NDE may process the data like
aggregation. A device with IPv6 NetStream configured typically acts as an NDE.
• 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.
• 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 56 IPv6 NetStream system
As shown in Figure 56 , 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
NSC
NDA
NDE
NDE