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Abnormality of the NetStream Sampling Caused by Upgrade of the Software Version of the NE40E

Publication Date:  2012-07-27 Views:  38 Downloads:  0
Issue Description
Networking: GSR----NE40E----Network Egress
Version: V3R2C06B325
Symptom of the fault:
After the NE40E is upgraded from V300R001C01B05D to V300R002C06B325, the sampled NetStream traffic reduces by half comparing with that before the upgrade. Run the following command to view the information:
[NE40E-GW-diag-ne5000]disp netstream efu ns-counter
NetStream Counter info:
00-Packet from LPU:270191123
01-orig cache full:0
02-agg cache full :99568211
03-orig bytes full:0
04-agg bytes full :0
05-orig fail :0
06-fib miss :1828
07-direct host :1229
08-mult/redir/cp :0
09-reserve :29727
The amount of discarded packets corresponding to 02-agg cache full: 99568211 grows continuously. 
 
Alarm Information
Null
Handling Process
Solutions:
1. If the V5 format meets the demand of the customer, configure the output format as V5.
Note: If V5 is enabled, the sampled packets cannot be directly forwarded from the SRU. Beware of the output format on the existing network.
2. If V5 is still in use, modify the sampling rate from 1000:1 to 2000:1, or even higher.
(The formula calculating the referential sampling rate is not fixed. The following method is provided for reference:
[NE40E-GW-diag-ne5000]disp netstream efu ns-counter;
02-agg cache full :XXXX The XXXX shall be the maximum value) 
 
Root Cause
Fault location:
The output format of NetStream in the existing network is configured as V9.
Before the upgrade, the V9 format in V300R001C01B05D is the same as the V5 format in packet forwarding and the contents of packets sent out are simple.
The V9 format is truly realized in V300R002C06B325. The contents of packets forwarded in V9 format are more specific and precise and the NetStream process is more complex. Therefore the board performance of V300R002C06B325 is not as good as that of V300R001C01B05D concerning the NetStream process. 
 
Suggestions
Null

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