[mrtg] Re: Weird Graphs

[Meyer, Douglas S.]

Hey all,

I am polling an OC-3 port on a Cisco 7206 router and I am seeing weird
anomalies on my graphs too.  See 

http://noc-test3.cc.purdue.edu/stats/data/cisco-tel3/cisco-tel3_po2_0-da
y.png

I'm pretty sure the outbound spikes between ~3AM-10AM every day are not
happening, but I have no idea why they show up.  Is it because my
version of Rateup is having the same issues?  I only see it on this port
on this router, but I am not seeing it on other devices such as GigE
links that have fivefold the amount of traffic on that OC-3.

Here is my target definition:

Target[cisco-tel3_PO2_0]: #PO2/0:public at cisco-tel3:::::2
MaxBytes[cisco-tel3_PO2_0]: 19375000
Options[cisco-tel3_PO2_0]: growright, bits
Title[cisco-tel3_PO2_0]: #PO2/0 -- cisco-tel3
PageTop[cisco-tel3_PO2_0]: <center><h2>Cisco-Tel3 port 2/0<br>
 OC-3 Link to Switch & Data - Indianapolis</h2>
 <h3>Max Speed:19.5 MBytes/s 155 Mbits/s</h3></center>
Directory[cisco-tel3_PO2_0]: cisco-tel3

Thanks,
-Doug



> -----Original Message-----
> From: mrtg-bounce at list.ee.ethz.ch [mailto:mrtg-bounce at list.ee.ethz.ch]
On
> Behalf Of Hakan M. Durgut
> Sent: Tuesday, December 31, 2002 8:06 AM
> To: mrtg at list.ee.ethz.ch
> Subject: [mrtg] Re: Weird Graphs
> 
> I did the upgrade, and I am using 64-bit rateup but I still get the
same
> thing..
> 
> Please see the image attached...
> 
> Can anybody use MRTG for high bandwidths ? I mean higer than 100 - 150
> Mbps ?
> 
> 
> -----Original Message-----
> From: Brander, Eric [mailto:Eric.Brander at ACS-INC.com]
> Sent: Thursday, December 19, 2002 3:06 PM
> To: 'Hakan Durgut'; mrtg at list.ee.ethz.ch
> Subject: RE: [mrtg] Weird Graphs
> 
> You are probably encountering false readings because of counter wrap.
> If
> you are polling the 32-bit snmp counter on your device, the counter
will
> reset back to 0 multiple times in a 5 minute period at high bandwidth
> utilization.  Try polling the 64-bit counter (if any... check your
mib).
> Also... I've had problems with MRTG properly dealing with numbers
larger
> than 32-bit in its calculations.  The latest version has a 64-bit
rateup
> that may solve those problems as well, but I understand its not quite
a
> stable release yet. /shrug
> 
> Eric
> 
>  -----Original Message-----
> From: 	Hakan Durgut [mailto:hakandurgut at bnet.net.tr]
> Sent:	Thursday, December 19, 2002 5:23 AM
> To:	mrtg at list.ee.ethz.ch
> Subject:	[mrtg] Weird Graphs
> 
> Content-Type: text/plain;
> 	charset="us-ascii"
> Content-Transfer-Encoding: 7bit
> 
> I am monitoring my Lucent CBX ATM Switch's STM4 ( OC12 ) physical
port's
> IN/OUT traffic via MRTG,
> 
> 
> 
> the blue lines ( OUT ) sometimes decrease and increase back to the
> normal traffic,
> 
> with some other SNMP tools, I get the right values, for example in the
> graph, in between 9 and 19:30 the traffic is really high, but I get
> wrong values.
> 
> Any Idea ? I guess my MRTG does it with the values higer than 110
Mbps,
> my other example is my Total Border traffic ( upstreams + satelite +
> peerings )
> 
> PS : I run mrtg-2.9.17
> 
> Thanks. ,
> Hakan
> 
> 
> 
> 
> 
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