Moved sFlow page to site
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### This article will describe everything about sFLOW from hardware side
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### Extreme
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Please be aware! Extreme XOS operating system before 15.4 release lack of support for ingress sflow, only for egress ([source](http://extrcdn.extremenetworks.com/wp-content/uploads/2014/01/EXOS_Command_Reference_Guide_15_4.pdf)). Please use 15.4 version or more recent.
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Example of sFLOW configuration for Extreme XOS:
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```bash
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configure sflow collector 10.0.2.33 port 6343 vr "VR-Default" # add collector
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configure sflow agent 10.0.2.15 # agent address
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configure sflow poll-interval 1 # send data to collector once per second
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configure sflow sample-rate 1024 # sampling rate
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enable sflow ports 1:39,1:40,2:39 both # add ports to sFLOW monitoring for egress and ingress traffic.
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enable sflow # enable sflow globally
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```
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Check configuration for correctness:
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```bash
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show sflow
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SFLOW Global Configuration
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Global Status: enabled
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Polling interval: 1
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Sampling rate: 2048
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Maximum cpu sample limit: 2000
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SFLOW Configured Agent IP: 10.0.2.15 Operational Agent IP: 10.0.2.15
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Collectors
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Collector IP 10.0.2.33, Port 6343, VR "VR-Default"
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SFLOW Port Configuration
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Port Status Sample-rate Subsampling
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Config / Actual factor
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1:39 enabled 1024 / 1024 1
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1:40 enabled 1024 / 1024 1
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2:39 enabled 1024 / 1024 1
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```
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### Juniper EX
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Juniper EX sFLOW configuration: [link](http://kb.juniper.net/InfoCenter/index?page=content&id=KB14855).
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### sFLOW configuration on Linux
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We recommend this [project](http://host-sflow.sourceforge.net/).
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You could use this reference for configurarion on Debian 8 Jessie BOX:
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```bash
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cd /usr/src
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wget 'http://downloads.sourceforge.net/project/host-sflow/Latest/hsflowd_1.27.3-1_amd64.deb?r=&ts=1435142676&use_mirror=netcologne' -Ohsflowd_1.27.3-1_amd64.deb
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dpkg -i hsflowd_1.27.3-1_amd64.deb
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```
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Configure iptables:
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```bash
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MOD_STATISTIC="-m statistic --mode random --probability 0.0025"
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ULOG_CONFIG="--ulog-nlgroup 1 --ulog-prefix SFLOW --ulog-qthreshold 1"
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iptables -I INPUT -j ULOG $MOD_STATISTIC $ULOG_CONFIG
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iptables -I OUTPUT -j ULOG $MOD_STATISTIC $ULOG_CONFIG
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```
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Configure daemon ```vim /etc/hsflowd.conf```:
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```bash
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DNSSD=off
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ulogGroup = 1
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ulogProbability = 0.0025
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collector {
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ip = 127.0.0.1
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udpport = 6343
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}
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```
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Let's start:
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```bash
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systemctl restart hsflowd
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```
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### Qtech switches
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Qtech QSW-8200-52T and Qtech QSW-2850-28T has some bugs in sFLOW implementation. Sflowtool could not parse they too. Waiting answer from developers.
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Page was moved to our [site](https://fastnetmon.com/docs/sflow/)
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