perfSONAR User Q&A and Other Discussion

[Nicolas Simar <>]

Hi,

I think there might be a mismatch in the configuration of the RRD MA. 
The IP address for ISTF second link and is linked to so-0/1/1 (STM-1).
So-6/0/0 is a 10Gbps interface to Telia.

Cheers,
Nicolas

Vedrin Jeliazkov wrote:
> Hello Mark,
>
> Thanks for your feedback!
>
> We also noticed this problem a few days ago. One possible thing to check in
> GEANT2 RRD MA's config is whether the counters in
>
> /home/taksometro/cricket-data/bandwidth/rt1.bud.hu.geant2.net/so-6_0_0.rrd
>
> are stored indeed in Bps (bytes per second), as reported by the service. They
> might have been instead multiplied to become bps (bits per second). However,
> even such multiplication could not justify your findings below, so perhaps
> only a closer look would reveal the real issue.
>
> Best regards,
> Vedrin
>
> Mark Gordon 
> <>
>  wrote:
>
>
> > Hello everyone,
> >
> >         I was working with querying utilization data from 
> > measurement archives when I noticed one was reporting utilization 
> > data for an interface greater than it's capacity.  The interface in 
> > question is istf-bckp.rt1.bud.hu.geant2.net (62.40.125.65) 
> > outbound.  At the time I was querying the utilization was 6% over the 
> > capacity, but extending my search backward a little showed that it 
> > had been up as much as 60% above capacity.  I queried the MA with the 
> > following interface ...
> >
> > ....<nmwgt:interface 
>
> xmlns:nmwgt="<http://ggf.org/ns/nmwg/topology/2.0/>http://ggf.org/ns/nmwg/topolo
> gy/2.0/">
>
> > ....    <nmwgt:hostName>rt1.bud.hu.geant2.net</nmwgt:hostName>
> > ....    <nmwgt:ifName>so-6/0/0</nmwgt:ifName>
> > ....    <nmwgt:ifDescription>LowQ Link to ISTF 2 (Pr:T-Systems 
> > Id:041/3001)</nmwgt:ifDescription>
> > ....    <nmwgt:ifAddress>62.40.125.65</nmwgt:ifAddress>
> > ....    <nmwgt:direction>out</nmwgt:direction>
> > ....    <nmwgt:authRealm>GEANT2</nmwgt:authRealm>
> > ....    <nmwgt:capacity>155520000</nmwgt:capacity>
> > ....</nmwgt:interface>
> >
> > and got the following datum like this back
> >
> > ....<nmwg:datum timeValue="1184141100" value="2.5468027626764405E8" 
> > valueUnits="Bps"/>
> >
> > 2.5468027626764405E8 = 254680276
> > 254680276 > 155520000
> >
> > Thanks
> > -Mark 

--
Nicolas
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Nicolas Simar
Network Engineer

DANTE - www.dante.net

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