Hallo, I implemented the example 'efcbq' in the package, iproute2 and observed the 2 flows, namely BE and EF flows. The EF class is 'isolated' hence by right, BE is not allowed to borrow bandwidth from EF. However, it is observed that BE flows ramp up immediately after the EF traffic flow was cut off. Anyone can offer an explanation? Does that not contradict class isolation ? Thanks cheewei