[ovs-discuss] Multiple sFlow instances in Open vSwitch

[Peter Phaal]

It looks like you are using Mininet. You might find following real-time dashboard useful for visualizing the sFlow data:

http://blog.sflow.com/2016/05/mininet-dashboard.html <http://blog.sflow.com/2016/05/mininet-dashboard.html> 

You were originally sampling at 1-in-1. This will impact performance and limit the size of network you can build and monitor with Mininet. Backing off to 1-in-10 greatly reduces the monitoring overhead. In production OVS deployments sampling rates of 1-in-1000 are more reasonable. 

A polling interval of 1 second tends to be inaccurate since the switch port counters are only updated every second. Backing off to a 10 second polling interval will give less noisy results and also reduce overhead.


> On Sep 20, 2016, at 12:23 PM, Syed Faraz Ali <farazali86 at gmail.com> wrote:
> 
> Thanks a lot.
> Just tested and both sFlow collectors are receiving the traffic.
> 
> On Tue, Sep 20, 2016 at 9:06 PM, Peter Phaal <peter.phaal at inmon.com <mailto:peter.phaal at inmon.com>> wrote:
> 
> > On Sep 20, 2016, at 11:18 AM, Ben Pfaff <blp at ovn.org <mailto:blp at ovn.org>> wrote:
> >
> > On Tue, Sep 20, 2016 at 08:06:19PM +0200, Syed Faraz Ali wrote:
> >> Is there a way to configure multiple sFlow instances running on the OVS?
> >> I configured an instance below:
> >>
> >> *ovs-vsctl -- --id=@sflow create sflow agent=eth0 target=\"192.168.1.1:6343 <http://192.168.1.1:6343/>
> >> <http://192.168.1.1:6343 <http://192.168.1.1:6343/>>\" header=128 sampling=1 polling=1 -- set bridge
> >> s1 sflow=@sflow*
> >>
> >> However, the instance gets overwritten if i configure another instance
> >> (though with a different IP and port).
> >>
> >> Multiple sFlow instances are not supported by OVS?
> >
> > Each bridge can have one sFlow instance.
> 
> You can send sFlow from the single instance to multiple destinations:
> 
> sudo ovs-vsctl -- --id=@sflow create sflow agent=eth0 target=[\"10.0.0.70:6343 <http://10.0.0.70:6343/>\",\”10.0.0.72:6343 <http://10.0.0.72:6343/>\"] header=128 sampling=10 polling=10 -- set bridge s1 sflow=@sflow
> 
> 

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