[mrtg] Spikes in graph

[Mir Hafeez Ali]

Hello everyone,
Can any one help me sort out this issue.  I am getting spikes in the graph.
The problem is that earlier I was plotting from  STM1 sub-interface and the
results were perfect.  
Just recently we have replaced a new STM4 Card and all our gateway traffic
is passing through one of its sub-interface configured on this STM4.   The
problem is that my graphs are showing spikes from time to time where as
there is no degradation of service. Below is the configuration of my file
and the png image sample.


## Interface 108 >> Descr: 'ATM2/0/0.1-aal5-layer' | Name: '' | Ip:
'10.158.100.1' | Eth: '' ###
Target[igw]: /10.158.100.1:public at 10.10.10.1:::::2
SetEnv[igw]: MRTG_INT_IP="10.158.100.1"
MRTG_INT_DESCR="ATM2/0/0.1-aal5-layer"
MaxBytes[igw]: 74880000
Options[igw]: bits,nopercent
YTics[igw]: 15
kilo[igw]: 1024
XSize[igw]: 600
YSize[igw]: 250
Title[igw]: Main Traffic to IGW (Primary)
PageTop[igw]: <H1>Main Traffic to IGW (Primary)</H1>
 <TABLE>
   <TR><TD>System:</TD>     <TD>Gateway Router</TD></TR>
   <TR><TD>Interface:</TD>  <TD>ATM2/0/0.1</TD></TR>
   <TR><TD>Ip Address:</TD> <TD>10.158.100.1</TD></TR>
 </TABLE

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