[mrtg] Re: Spikes in MRTG graphs and logs...

Schuyler Bishop SBishop at e-xpedient.com
Tue May 22 21:25:54 MEST 2001

Per request, here are the relevant codes with appropriate removals of
private info.  :)  Note that the IPs have been changed to protect the

Old config: (2.8.12)

Target[]: 6:public at
MaxBytes[]: 19375000
Title[]: Router (router.internal.com): POS
Options[]: growright,bits
PageTop[]: <H1>Traffic Analysis for POS3/0/0.500
 <BR>OC-3 Circuit</H1>
   <TR><TD>System:</TD><TD>Router in </TD></TR>
   <TR><TD>Interface:</TD><TD>POS3/0/0.500 (6)</TD></TR>
   <TR><TD>IP:</TD><TD>router.internal.com (</TD
   <TR><TD>Max Speed:</TD>
       <TD>19.4 MBytes/s (frame-relay)</TD></TR>
New Config: (2.9.12a)

options[_]: growright,bits
Target[]: / at
MaxBytes[]: 19375000
Title[]: POS3/0/0.500 OC-3 Circuit ID  -- Router
PageTop[]: <H1>POS3/0/0.500 OC-3 Circuit ID -
   <TR><TD>System:</TD>     <TD>Router in </TD></TR>
   <TR><TD>Maintainer:</TD> <TD></TD></TR>
   <TR><TD>Description:</TD><TD>POS3/0/0.500 OC-3 Circuit ID - </TD></TR>
   <TR><TD>ifType:</TD>     <TD>frame-relay (32)</TD></TR>
   <TR><TD>ifName:</TD>     <TD>PO3/0/0.500</TD></TR>
   <TR><TD>Max Speed:</TD>  <TD>155.0 Mbits/s</TD></TR>
   <TR><TD>Ip:</TD>         <TD> (router.internal.com)</TD></TR>

Hope that helps.


-----Original Message-----
From: Alex van den Bogaerdt [mailto:alex at slot.hollandcasino.nl]
Sent: Monday, May 21, 2001 9:48 AM
To: SBishop at e-xpedient.com
Cc: mrtg at list.ee.ethz.ch
Subject: Re: [mrtg] Re: Spikes in MRTG graphs and logs...

Schuyler Bishop wrote:

> Interestingly enough, I've found that the spikes are caused by using an
> config created by an old version of cfgmaker, and running with the latest
> version of MRTG.  When I create a config for the same router, and run it
> parallel with the older-cfgmaker-created-version (same version of MRTG),
> newer-cfgmaker-created config shows no spike.

Could you look for relevant differences in those configs please?
You can skip the remarks, most likely it is a maxBytes setting or so.

 / alex at slot.hollandcasino.nl                  alex at ergens.op.het.net \
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