A Simple Approximation to Minimum-Delay Routing

13 years 9 months ago

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The conventional approach to routing in computer networks consists of using a heuristic to compute a single shortest path from a source to a destination. Single-path routing is very responsive to topological and link-cost changes; however, except under light trafﬁc loads, the delays obtained with this type of routing are far from optimal. Furthermore, if link costs are associated with delays, single-path routing exhibits oscillatory behavior and becomes unstable as trafﬁc loads increase. On the other hand, minimumdelay routing approaches can minimize delays only when trafﬁc is stationary or very slowly changing. We present a “near-optimal” routing framework that offers delays comparable to those of optimal routing and that is as ﬂexible and responsive as single-path routing protocols proposed to date. First, an approximation to the Gallager’s minimum-delay routing problem is derived, and then algorithms that implement the approximation scheme are presented and veriﬁed....

Srinivas Vutukury, J. J. Garcia-Luna-Aceves

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