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This work addresses traffic class dependent (TCD) routing, using different link-cost functions, in the intersatellite link (ISL) network of a nongeostationary packet-switched satellite communication system. Three different traffic classes are introduced, each with its particular optimisation criteria. Performance analysis of TCD routing, in terms of average packet delay and average data throughput of a particular traffic class, is evaluated for homogeneous and nonhomogeneous traffic scenarios using a specifically developed simulation model of the ISL network.