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FAQ- How Is the NetStream Sampling Rate Configured on the NE40 and NE80

Publication Date:  2012-07-27 Views:  74 Downloads:  0
Issue Description
Q:
Version:
VRP (R) software, Version 5.30(NE40&80 V300R002C01B591)
The fault symptom is as follows:
1. The engineer set the sampling rate to 1000. However, after the configuration was completed, the sampling rate changed into 1024. Why?
2. The sampling rate can be configured in the interface or system view. Which one takes effect preferentially? 
 
Alarm Information
Null
Handling Process
A:
1. Configure the sampling rate in either of the following ways:
a. Fixed sampling rate: The Nth (a value set by the user) packets are to be sampled. Thus, a packet is collected from every N packets.
The corresponding command is ip netstream sampler {inbound|outbound} 1000. In this case, the sampling rate actually advertised is 2n that is closest to the set value (1000). The sampling rate displayed on the interface is the one actually advertised. That is, when the user set the value to 1000, the sampling rate displayed on the interface is 1024.
b. Random sampling rate: It cannot be ensured that a packet from every N packets is collected, but it is ensured that M packets are collected from every N x M packets.
The corresponding command is ip netstream sampler {inbound|outbound} 1000. In this case, the sampling rate actually advertised is the one set by the user.
2. The sampling rate configured on the interface is adopted preferentially. If the sampling rate is not configured on the interface, the sampling rate configured in the system view is adopted. If the sampling rate is not configured globally either, the sampling rate is defaulted at 1:1. 
 
Root Cause
Null
Suggestions
Null

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