[mrtg] extrange graphs multi-target

[luis suarez]

Hello to all,
I need some help with MRTG. I'm monitoring four high speed interfaces and I want to measure the total bytes transferred by all of them. Currently I add the variable values just by adding the the interfaces in the .cfg file as explained in some manual I found. 
It's like
 [target]: 1:public at 192.168.0.1 + 2:public at 192.168.0.1 + 3:public at 192.168.0.1 + 4:public at 192.168.0.1

It works when traffic is under 25 % of maximum ( say, 100 MBit/s ) , but it starts showing peaks and cliffs when it gets higher values. The log file looks ok, so any idea about how can I solve this ? 

Regards
Luis

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