[mrtg] Re: Truncated graphs?

[James Overbeck]

The 32-bit counters of SNMPv1 loop at five minute intervals at about 114 
Mbps. So the maximum bandwidth you can monitor normally with MRTG is 114 
Mbps. There are a few ways aroung this:

- Switch from rateup to rrdtool. This will allow you to run mrtg at 
shorter intervals. More information on 
http://people.ee.ethz.ch/~oetiker/webtools/mrtg/reference.html .
- Hack MRTG to eliminate the minimum five minute interval. This will 
allow you to run MRTG at shorter intervals and keep your graphs and 
display pages exactly where they are, but it will also negatively impact 
your monitoring system.
- Poll the ifHC* counters with snmpv2c, if your devices support it. More 
information on 
http://people.ee.ethz.ch/~oetiker/webtools/mrtg/reference.html . This 
will allow you to stay with 5 minute intervals.

-james


Bill Anderson wrote:
> Greetings,
> 
> I'm running mrtg-2.9.17 on a RedHat box, mostly all is well, until recently
> traffic on some of our interfaces (on GSRs and 6509s) started going over
> 120Mb/s.    105 Megs, no problem, but over about 110-120, the graphs start
> to look truncated...hmmm...not trucated exactly, but like the bottom  is cut
> off, and instead of showing say 120, they'll show 30.   It's like when
> traffic goes over 110 megs, it just subtracts 110, and shows the remainder.
> 
> This occurs on POS and GigE interfaces, MaxBytes is set at 19375000 and
> 125000000 respectively.
> Has anbody run into this?   Any advice much appreciated!
> 
> Thanks,
> Bill
> 
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