Dedicated Servers- Calculating Bandwidth

Hi i would like to know what dedicated server companies use to get the monthly gig totals for billing purposes. I have seen MRTG with the 14all patch but, how can that possiblely work well for larger companies with thousands of servers. How does it interface with its billing system to bill customers for overage.

So my main question is what is used to do this?

THanks.

 

 

 

 

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