The main topic in the paper is a problem of classification of packets in high speed networks (2.5 and 10 Gbps). More processing power is needed in the nodes because of the ever increasing speed of ...physical links and the growing complexity of network devices. The process of classification is the essential factor impacting the throughput of whole system. In the introduction the topic is classified from the point of view of telecommunication's requirements and trends. In the continuation paper describes architectures of modern communication devices and analyse the building blocks. A modern switch is typically built of a processor, a fast memory and integrated circuits with implemented logic. The main reason for rapid evolution of the switch architectures lies in the requirement for ever faster and more intelligent devices in the network nodes. A preview of evolution path to the fifth generation of switch architectures is presented, with the analysis of different building blocks and components, which are appropriate for implementing the functionality of classification algorithms. Technics for improving the performance of classification algorithms are also shown with the illustration of limitations of the nowadays systems. The paper is concluded with requirements and suggestions for the new generation of switches, where the need for higher flexibility in the mean of programmability is exposed. The importance of functional programming in these environments is the closing theme.
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