Problems
In order for IntServ to work, all routers along the traffic path must support it. Furthermore many states must be stored in each router. As a result, IntServ works on a small-scale, but as you scale up to a system the size of the Internet, it is difficult to keep track of all of the reservations.
One way to solve the scalability problem is by using a multi-level approach, where per-microflow resource reservation (i.e. resource reservation for individual users) is done in the edge network, while in the core network resources are reserved for aggregate flows only. The routers that lie between these different levels must adjust the amount of aggregate bandwidth reserved from the core network so that the reservation requests for individual flows from the edge network can be better satisfied.
Read more about this topic: Integrated Services
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