Bandwidth Broker carries up, again, many of the problems of the IntServ model. The two solutions are not interchangeable because of the IntServ's serious scalability problems we have seen, but on the other hand, DiffServ has administration problems in the allocation and accounting of the resources needed by applications. We can state that there are many pieces in the QoS puzzle that are already in the right place, while other pieces have to be better positioned. This model allows a smooth deployment of QoS and above all separates Campus needs from ISP needs. Conclusion Technology aimed at Quality of Service deployment is quite mature, but we are not sure folks have completely learnt the lesson of these early years of QoS experiments.
Some questions arise spontaneously and lead to some controversial answers.
Up to now it has been a problem of political agreement. They are both necessary in order to get rid of debts. It's not clear whether it is needed or not.