Asymptotic performance limits for routing and rate allocation in rate-based multi-class networks

Ahtmct-In this paper we investigate the performance of Routing and Rate Allocation (RRA) algorithms in ratebased multi-class networks, in particular, a network of routers that support the IntServ Guaranteed Services. We measure the performance of an RRA algorithm in terms of its weighted carried traffle. We derive an upper bound on the weighted carried t r d e of any RRA algorithm. The bound can he computed by linear programming. Morwver we show that a Fixed RRA algorithm achieves the bound asymptotically. Therefore the bound can he used as an absolute benchmark for the performance of various RRA algorithms. We illustrate this by comparing the simulated performance of a simple shortest-path RRA (SP-RRA) algorithm with the bound.