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Implementing fast IP packet classification

Posted: 03 Oct 2008     Print Version  Bookmark and Share

Keywords:configurable processor  IP packet  200MHz processors 

This application note explains how to achieve fast IP packet classification with a configurable processor. Packet classification requires multiple field matching such as the IP source address, IP destination address, source port number, destination port number, protocol number, differentiated service code point (DSCP) and more. To accelerate table lookups and bitmap manipulation, several customised instructions were developed to yield large performance improvements. By using two 200MHz processors with a proper configuration, OC48 wire-speed packet classification can be achieved while matching on multiple fields with sophisticated rules of ranges and/or prefixes.

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