[mrtg] Re: Data Collection Size Limitation?

[Steve Shipway]

> http://img250.imageshack.us/my.php?image=router8qq.gif
> 
> Between 00:00 and 04:00 you can see the problem.  The same 
> problem appears every day during the same approximate window 
> (during our really busy hours).  The interface is GigE and 
> I'm using an AbsMax of about 10Gb to make sure we're not 
> going beyond the bounds.

Looks very much like the old wrapping-counter problem.  If you use a 16-bit
counter for a fast link, then at about 130Mb/s or so the counter gets so big
that MRTG thinks it has wrapped around, hence you get this effect (I may be
a bit wrong with the numbers but thats it in a nutshell).

The solution is to use the SNMPv2 and 64bit high-speed counters for this
interface, then everything works.  Seen the same problem here, switched to
use 64bit, all now OK.

Steve


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