[mrtg] help with counter issue
gabrielle.roth at xo.com
Fri Apr 13 21:07:55 MEST 2001
OK, I have managed to completely confuse myself.
I am using mrtg to monitor a series of ATM PVCs at a 10-minute interval. On
the major interface, I get these funny dips periodically. (Image attached,
will be removed by the listbot.)
It seems to me from what I've read and seen on this list that this is
probably a counter rollover issue. The faq
(http://faq.mrtg.org/FAQ004.html) says "32 bit will allow for a maximum
value of 4294967295, and when divided by 300 (seconds) this is about 14
megabytes per second or 114 megabits per second." But, I'm getting less
than 14 Mb: when I add up the numbers from the sub-ifs, they add up to just
under 4 Mb. I'm guessing this is because the *max* is 14M, and mine is just
showing less than that. ???
I set up a shell script to grab the ifOutOctets from this interface every
two minutes. It rolls over about every 20 minutes, which is more than my
polling interval. Unfortunately I have no other WAN interfaces that are
running this much traffic so I can't make a valid comparison that way.
Am I missing something totally obvious or do I need to investigate this
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