[mrtg] Re: Returned values being rolling over, clipped or something

Tim Schuh tschuh at verio.net
Tue Oct 19 23:27:26 MEST 1999

It sounds like you're rolling the counters over.  You'll probably need
to decrease your polling interval to preserve that data.  If you do
the math for the data rate you're seeing, I bet you'll find that 2^32
is smaller than your ifInOctets or ifOutOctets over the interval
you're using now.


Rod Oliver wrote:
> Hi All,
> A few weeks ago I had a problem when the values to be graphed by MRTG seemed
> to be lower than should be expected. The interfaces being graphed having
> this problem all regularly see in the order of at least 100Mb going through
> them. When the traffic over the interface gets up to around 100Mb MRTG
> starts to graph it as being much lower, as if suddenly there were a lot of
> dropped packets. I checked the interface and the number of packets through
> it did not compare to that shown by MRTG. When I change the frequency of the
> crontab for running MRTG from every 5 minutes to every minute the graphing
> becomes normal. I don't much like the idea of having to send snmp gets to
> the interfaces that frequently if I can otherwise help it. Is this due to a
> limitation of SNMP, of MRTG or something that I have overlooked?
> Rod Oliver
> chello broadband nv
> Network Operations


Tim Schuh
Network Systems
Verio Central

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