Integrated services: Encyclopedia II - Integrated services - Problems

Integrated services - Problems

The problem with IntServ is that 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. As a result, IntServ is not very popular.

One way to solve this 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 invididual flows from the edge network can be better satisfied. See RFC 3175.

Adapted from the Wikipedia article "Problems", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki