Using cacti to monitor bandwidth consumption
Cacti is a free network graphing tool that is used to visualize the time series data obtained by the Round-Robin database tool (RDD tool).
The tool polls network devices like switches and routers via SNMP and then graphs their data. Some of the data that are polled are CPU load, temperature, uptime and network bandwidth utilization. 
Here we shall focus on how you can monitor your bandwidth from the cacti graphs.
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