[mrtg] graphing max?

Mohamed S. mohamed at divinesword.com
Mon Oct 25 17:59:53 MEST 2004

I have the following config to retrieve bandwidth info from a CISCO switch:

cfgmaker  --ifdesc=name --no-down \
--global "Interval: 5" --global "Refresh: 300" \
--global "Options[_]: growright, avgpeak, bits, noinfo, integer" \
--global "MaxBytes[_]: 125000000" \
--global "AbsMax[_]: 125000000"

The Max settings of 125000000 should allow me to graph well over 100Mbit/s
(125000000*8), actually 1Gbit/s worth of traffic since this is on a fiber
optic GigE port. Despite the MaxBytes and AbsMax settings however, when the
BW graph climbs to over ~105Mbit/s, it falls back down to 0! and then
continues to climb from there. ie: if port is actually pushing 140Mbit/s, it
will only show ~35Mbit/s on the graph after having dropped down to 0.

I'm not sure what is going on here. Any clues?

I included an attachment of the MRTG graph in question. You will see what I
mean at the 6AM and 3PM time spot. If you cannot see the attachment, a copy
is available at: http://www.shaketheworld.ca/port1-day.png



-- Attached file removed by Ecartis and put at URL below --
-- Type: image/png
-- Size: 3k (3257 bytes)
-- URL : http://www.ee.ethz.ch/~slist/p/port1-day.png

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