OmniSwitch OS6860/OS6900/OS10K Troubleshooting Guide Part No.032996-00 Rev.A
AOS Release 7.X and 8.X January 2015
Alcatel-Lucent Page 142 of 148
Packet sampling uses randomness in the sampling process to prevent synchronization with any periodic
patterns in the traffic. While suggested packet sampling does not provide a 100% accurate result, it does
provide a result with quantifiable accuracy. sflow.org provides examples and describes the basic techniques
used to calculate results and quantify accuracy when processing packet sample data. If you use 3rd party
software like InMon, this is already taken into account.
If the switch is experiencing congestion, the sample interval will increase.
This can be corrected by applying the following commands lines in the CLI which will reset the rate back to its
originally configured rate.
sflow sampler 1 port 1/1 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/2 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/3 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/4 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/5 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/6 receiver 1 rate 5 sample-hdr-size 128
Configuration example:
sflow agent ip 192.168.10.14
sflow receiver 1 name sflow address 192.168.10.11 udp-port 6343 packet-size 1400 version 5
timeout 0
sflow sampler 1 port 1/1 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/2 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/3 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/4 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/5 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/6 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/35 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/36 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/37 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/38 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/39 receiver 1 rate 5 sample-hdr-size 128
sflow sampler 1 port 1/40 receiver 1 rate 5 sample-hdr-size 128
sflow poller 1 receiver 1 port 1/35 interval 5
sflow poller 1 receiver 1 port 1/36 interval 5
sflow poller 1 receiver 1 port 1/37 interval 5
sflow poller 1 receiver 1 port 1/38 interval 5
sflow poller 1 receiver 1 port 1/39 interval 5
sflow poller 1 receiver 1 port 1/40 interval 5
22.1. sFLOW Debug
CLI Command syntax:
DEBUG SFLOW DUMP STATISTICS
Dumps statistics on the datagrams transferred.
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