[mrtg] links addition not working fine !!

[Mohamed Eldesoky]

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Hi, 

I am using mrtg with rrdtool to monitor the network routers.
I am trying to sum the total bandwidth used in the backbone links.
2 of the links run off a cisco, the third runs off a Juniper.
The individual links graph fine, but when trying to add them up, using the 
normal mrtg "+", it works fine half of the day, and the other half (during 
activity time) it just shows near zeros and near maximum (alternatively, like 
a jigsaw shape !!)

Any one experienced something similar ?

Regards
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