[c-nsp] IP SLA monitoring

[Siva Valliappan]

the Cat4k doesn't support IP SLA.  i guess from the below it works even
if it's not "officially" supported.  also IP SLA is being processed by 
the CPU and not in hardware on the 4k


On Wed, 22 Nov 2006, Jee Kay wrote:

> On 22/11/06, Rodney Dunn <rodunn at cisco.com> wrote:
>> But can't you set the frequence down to 1 second under
>> the probe?
>
> Quite possibly... I don't know what the effect of having so many
> skipped operations might be.
>
> On a side note, I'm very confused by the numbers being produced by
> these jitter graphs. I have a Cat4500 SupV plugged directly into a
> Cat4500 SupV via an FE copper cable, and am getting numbers like these
> coming out:
>
> RTT Values (milliseconds):
> NumOfRTT: 1000  RTTAvg: 2       RTTMin: 1       RTTMax: 23
> RTTSum: 2656    RTTSum2: 8720
>
> Jitter Values (milliseconds):
> MinOfPositivesSD: 1     MaxOfPositivesSD: 20
> NumOfPositivesSD: 77    SumOfPositivesSD: 265   Sum2PositivesSD: 1553
> MinOfNegativesSD: 1     MaxOfNegativesSD: 20
> NumOfNegativesSD: 102   SumOfNegativesSD: 267   Sum2NegativesSD: 1457
> MinOfPositivesDS: 1     MaxOfPositivesDS: 4
> NumOfPositivesDS: 148   SumOfPositivesDS: 215   Sum2PositivesDS: 437
> MinOfNegativesDS: 1     MaxOfNegativesDS: 4
> NumOfNegativesDS: 124   SumOfNegativesDS: 217   Sum2NegativesDS: 543
>
>
> Both have 'rtr responder' configured. How on earth is RTTmax 23ms?!
> And how am I managing to get jitter of 5ms+ on such a direct link? It
> seems to me that the responder is not responding very quickly..
>
> On another link, between a c2621 and the same Cat4500/SupV, with the
> monitor configured on the c2621, I consistantly see the jitter 'from D
> to S' (ie 4500->2621) being a rock solid 4ms, but the jitter from S to
> D varies massively between 2ms and 20ms. Again these two devices are
> connected by nothing more complicated than a piece of copper cabling.
>
> Am I doing something drastically wrong, or should I expect the
> responder to take significant amounts of time to respond? I have some
> 30-40ms latency links that show RTTmax at over 900ms occasionally,
> presumably again due to the same problem.
>
> Thanks,
> Ras
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