lartc.org FAQ : HTB Shaping rules :
Rate of the class
To make sure this is always true, you have to make sure that the sum of the rates of a class never exceeds the parent rate. In the next example, class 10 and 20 have rate = 60 so together 120 and this is more then rate of the parent (100 and consider this is a real limit). So they can only get 50 wich is less then the configured rate. So with rate = 50 for class 10 and 20 it's more clear what's going on.
1 / \ 10 20
1 : rate= ceil = 100
10 : rate = 60, ceil = 100
20 : rate = 60, ceil = 100
Rule 3: sum (rate of childs) <= parent rate
stef.coene@docum.org
Ceil of the parent class