Hi all I don't think that changing sampling rate to 1 is the solution. sFlow by its nature is sampled as you will read here: http://www.sflow.org/about/sampling_theory.php
This explains why the figures you see are not 100% accurate. What I could do in ntop is to scale the figures based on sampling rate you specify on the switch, but yet this is not a 100% accurate solution Cheers Luca On Nov 3, 2008, at 5:26 PM, jr wrote: > Patrick, > this is done on the switch, if it supports it. > My switches (HP ProCurve) won't let me sample any more often than > every > 20st packet :/ > regards, > johannes > > Am Montag, den 03.11.2008, 08:18 -0800 schrieb Patrick Topping: >> Gerhard, >> >> I am suffering from the same issue.... Where did you make the change >> for this --> I've configured the rate to 1 on all ports. >> >> Thanks in advance. >> >> -Patrick >> >> -------------------------- >> >> >> Gerhard Mourani wrote: >>> Hello Luca, >>> >>>> How did you configure sflow in your foundry? >>> I've configured the rate to 1 on all ports. After doing this, I >>> can see >>> that captured informations are better accurate but not 100%. For >>> example, if I transfers 100 MB now, I will see around 90 MB. I >>> think I >>> cannot do better than that because it use sampling as you said. >>> >>> Gerhard, >>> >>> Luca Deri wrote: >>> >>>> Gerhard >>>> sflow uses sampling. hence if you send let's say 100 you will see 1 >>>> using sflow. How did you configure sflow in your foundry? >>>> >>>> Luca >>>> >>>> On Oct 31, 2008, at 7:33 PM, Gerhard Mourani wrote: >>>> >>>> >>>> >>>>> Hello List, >>>>> >>>>> I've activated the sFlow plugin into my ntop version 3.3.8 to >>>>> capture >>>>> and display sFlow data coming from my "Foundry Network FastIron >>>>> Edge >>>>> 9604" model. If I check inside the plugin page of sFlow about >>>>> 'sFlow >>>>> Interface Statistics' everything are correct and reported data >>>>> transfers >>>>> for 'Administrative' or 'Operational' status are ok. But now my >>>>> problem >>>>> is when I check inside the ntop web interface and especially about >>>>> collected data, here the problem is that returned informations >>>>> about >>>>> amount of data are wrong, I mean the amount of data doesn't >>>>> correspond >>>>> to what have really been transfered. So for example if I >>>>> transfer 135 >>>>> MBytes I can only see 295.0 KBytes in ntop. Someone know how to >>>>> fix >>>>> this? >>>>> >>>>> Thanks for your helps, >>>>> Gerhard, >>>>> _______________________________________________ >>>>> Ntop mailing list >>>>> [email protected] >>>>> http://listgateway.unipi.it/mailman/listinfo/ntop >>>>> >>>>> >>>> _______________________________________________ >>>> Ntop mailing list >>>> [email protected] >>>> http://listgateway.unipi.it/mailman/listinfo/ntop >>>> >>>> >>> _______________________________________________ >>> Ntop mailing list >>> [email protected] >>> http://listgateway.unipi.it/mailman/listinfo/ntop >>> >>> >>> >> _______________________________________________ >> Ntop mailing list >> [email protected] >> http://listgateway.unipi.it/mailman/listinfo/ntop > > _______________________________________________ > Ntop mailing list > [email protected] > http://listgateway.unipi.it/mailman/listinfo/ntop _______________________________________________ Ntop mailing list [email protected] http://listgateway.unipi.it/mailman/listinfo/ntop
