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NE40E Esight Netstream NTA Traffic Statistics Inconsistency

Publication Date:  2014-09-17 Views:  185 Downloads:  7
Issue Description
Problem:
Esight Monitoring Fails to show Valid and Consistent Traffic figures on NE40E with Netstream Configured.
Although sampling rate had been made more frequent to enhance the traffic accuracy on Esight, valid data and statistic analysis  still can not be shown.
Handling Process
1. Configuration of Netstream Parameters following the Manuals.
2. Beware that the Netstream functino need to acitvate on both the Interface view and SLOT view .
3. Monitoring the traffic data rate on monitoring port, pay attention to the input and output bandwidth utilization
4.Compare the Traffic Statistics between the Esight and the Data collected from the device
5. In case inconsistency of Traffic Statistic occurs:
    a. Tuning the sampling rate on monitoring devices, by "ip netstream sampler fix-packets 2000 inbound" , higher on lower sampling rate    depends on the difference between the actual data rate and the traffic statistic on Esight
    b. Double check the sampling rate configured on both the monitoring devices and that in the Esight , make sure they ar both consistent and the same in order to show accurate traffic statistic
6.  Fine tune the sampling on both the monitoring devics and Esight again to make the differences converge.  A  more realistic traffic statistics figures can take into account the  Network Performance, Esight Server Capability, Bandwidth of the Interconnection, the  End-User Host Traffic behaviour,etc. 
Root Cause
In order to solve the Inconsistent Traffic statistics on Esight, we need to tune the packets sampling rate on both the NE40E and Esight .

Not only does the Sampling rate should being consistent in both the Netstream monitoring device and Esight , in order to measure and indicat the traffic data rate on the monitoring ports, we need to take into account for Network Performance, Esight Server Capability, Bandwidth of the Interconnection, the  End-User Host Traffic behaviour,etc. 
Suggestions
Esight  with Netstream NTA configuation is a common deployment method to monitor the Network Performance and enforce the traffic Policy as well as enhancing the Network Security. The ports being monitoring offen connecting to the Internet and Public Network ,may be using BGP.
 Inorder to show accurate statistics for the network, the sampling rate on the devices should be properly configured, taking into account on the network performance, bandwidth of the Data channel,Esight Server performance, Traffic Behaviour, End-User applications, etc.    

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