[rrd-users] Re: Spikes

[Alex van den Bogaerdt]

Daniel Rinehart wrote:
> 
> 	I don't know if this is related but I've also been seeing some
> strange spikes in Octet readings I've been getting from one of my Cisco
> Catalyst 8510 ATM switches. I'm still at the initial stages of debugging this
> problem but this is what I have found so far.
> 	Values as seen by my Perl script doing the collection before
> passing them off to RRD:
>                   'atm_out' => 3438905,
>                   'atm_out' => 3457190,
>                   'atm_out' => 1484,
>                   'atm_out' => 19875,
> 
> 	Another sample:
>                   'atm_out' => 3421998,
>                   'atm_out' => 3452632,
>                   'atm_out' => 26394,
>                   'atm_out' => 58936,
> 
> 	Maybe, I'm missing something, but that sure looks like an odd wrap
> point to me.	
> 

This looks like a reset to me, not a wrap.  Not sure about the 8510 but
on the 5500 series the snmp counters will reset too when you issue a
clear counters command from the prompt.
Unfortunately the snmp uptime is *not* reset when doing this ...

>From 3452632 to 26394 should be seen as a wrap at 2^32 and therefore the
delta should be 4291541058. That's 4,291,541,058.  Divided by 300 (5min)
you should get a spike with size 14M.  Correct?

Regards,
-- 
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