[mrtg] drops in graph when summation

[Pavel Ruzicka]

Hello,

when I use summation for 3 STM-1 lines, I will get drops about 40Mbps in daily
graph periodicly every 2 hours.
When I look at independent graphs, there are not drops.
I use SNMPv2c, 64bit counters for measuring, MRTG2.9.17 with RRDTool.

I have another graph with summarized 5 targets and there are drops about
150Mbps every ~40minutes.

Is this some interference or counter clearing?

Best regards,

Pavel Ruzicka

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