According to cisco Qos Configuration guide
"The sum of all bandwidth allocation on an interface cannot exceed 75 percent of the total available interface bandwidth. The remaining 25 percent is used for other overhead, including Layer 2 overhead, routing traffic, and best-effort traffic.Bandwidth for the CBWFQ class-default class, for instance, is taken from the remaining 25 percent".
What happens if I define the class default traffic ? e.g
bandwitdh percent 60
bandwidth percent 15
Now where do the 25% go?
Is it added to the 15%?
Is it used only for layer 2 overhead and routing?
or gets distributed evenly between the classes?