Reporting back, as I think this is solved. I have reduced the sampling rate from 1 in 1000 to 1 in 10000. I am now getting what appear to be appropriate statistics.
Thanks, James On Tue, Jun 25, 2013 at 2:59 PM, James Wright <jamfwri...@gmail.com> wrote: > Just to share further investigation, it appears that the graphs are > correct, based on the stored flow data. Using nfdump shows the same > avg bps as what I see in the graph. I still don't know why this is > though. It seems that the issue is the switch or the way it samples > flows. The switches in question are 3Com 4800G (in case anyone has > experience with them and sflow). > > > Thanks, > James > > On Thu, Jun 20, 2013 at 2:35 PM, James Wright <jamfwri...@gmail.com> wrote: >> Hello Folks, >> >> I've been happily collecting netflow for a while and decided to try >> collecting from some devices providing sflow. Once setup the >> collection seems to work well. My issue is that the traffic (Bits/s) >> graph seems to hit a ceiling of ~125.8 Mb/s. At first I thought >> something was wrong with the switches, except that showing the stats >> on the interface that I am collecting sflow from seems to indicate >> that I am moving much more data than this (all over, but upwards to >> and above 200 Mb/s). >> >> It may be that I am not correctly understanding sflow, but I see >> reference to it being used for metering/billing, which suggests some >> accuracy exists. Currently I am collecting ingress/egress on the >> uplink ports of the switches (some are 1G, some 10G), a sampling size >> of 1000, and an interval of 2. It seems to me that this would be a >> bit accurate. >> >> The other graphs/statistics appear to be correct, and they do not >> appear to be hitting a ceiling. >> >> I am continuing to dig and learn, but has anyone else seen this before? >> >> >> Thanks, >> James ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Nfsen-discuss mailing list Nfsen-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfsen-discuss
