I want get the maximum interface utilization of a router interface for example the last 30 days by script. I think one way would be, to use rrdtool fetch. But I don’t know exactly what are the units of the values in the RRD File. In the .info in/out bandwidth would be the fourth and fifth field. But the values don’t correlate with the graph in the gui. Is there a documentation about units and values of interface RRDs?
Or is it possible to get the maximum utilization by API?