[ixpmanager] SFLOW Under Reporting?

[Ian Chilton]

Hi,

We have had a report from a member that the P2P graphs in IXP Manager 
are under-reporting compared to their own stats and to the overall 
traffic reported by MRTG. In fact on further comparison with the RRD 
files this morning and it seems we are seeing approximately half of the 
traffic vs the stats at their side.

Looking in to this, I see that the per-protocol graphs in IXP Manager 
are reporting about half of our total exchange traffic, vs MRTG.

I'm interested if anyone else has encountered a similar issue?

How close are your MRTG reported traffic levels and that of sflow? (and 
what switch vendor are you using?)

We are running Arista [EOS] and have the sflow sample rate set to [1 in] 
16384.

Thanks,

Ian