[rrd-users] troubleshooting low reported values in MRTG/RRDTool

David Ball davidtball at gmail.com
Tue Feb 5 21:09:11 CET 2008

MRTG v.2.15.1
RRDTool v.1.2.19 (or newer..still trying to see which one is being used)

  I'm having problems troubleshooting an 'issue' I'm having when
graphing in/out traffic on a GigEth interface on a Juniper router.
For 99% of the time, it works just fine, but as per the attached .png
image, there are times when the results MRTG gets are very low for the
1st value (inbound traffic).  I am able to monitor the interface's
traffic in real time and know that it rarely drops below 100Mbps
sustained, yet for several consecutive 5min readings, MRTG shows
rather low values.
  I'm not sure whether this is an RRDtool issue or an MRTG
issue.....or an issue at all for that matter.  Wasn't sure where else
to look, so thought I'd try here.

  The following are the last updated values in the pertinent .rrd file.
                        <!-- 2008-02-05 12:30:00 MST / 1202239800 -->
<row><v> 1.1171652967e+06 </
v><v> 4.8087008667e+06 </v></row>
                        <!-- 2008-02-05 12:35:00 MST / 1202240100 -->
<row><v> 2.7787683567e+06 </
v><v> 4.8814243700e+06 </v></row>
                        <!-- 2008-02-05 12:40:00 MST / 1202240400 -->
<row><v> 8.9273556000e+05 </
v><v> 4.5674221967e+06 </v></row>

   If anyone is able to nudge me in the right direction about what I
can look at to try to track this down, it'd be appreciated.

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