Is there a way to graph packets per second using SNMP?
I think this is impossible for many reasons like that it will consume the cpu and the routers resources and you don't need a graph for each second .
you could open the graph of any interface or client , it will show you a live graph and if you need to read a point on the graph simply point the mouse on it and hold the left click and it will give you the speed details and the time .
also you could activate the graphs for the interfaces and clients from tools -> graphing and do the same as above on the graphs .
with best regards .