Then someone asked me the network utilization graph for one of the MPLS links (20Mbps) which is currently peaking at 10Mb. In this graph, we have the Y-axis (left side) set at 10M max at this moment. I was asked if I can fixed the axis at 20Mb to give indication to the viewer that we still have enough traffic capacity for this MPLS link
Below are quick configuration steps in how to fixed the Y-axis for specific graphs. First, you have to determine the graph template used for this graph you want to modify. For the 20Mb MPLS graph above, the graph template "Interface - Traffic (bits/sec)" was used as seen below.
I hope this helps old school Cacti lovers.