An IP route lookup can be considered as a string matching problem on the destination address. Finite State Automata (FSA) are a \ufb02exible and ef\ufb01cient way to match strings. This paper describes how a routing table can be encoded as an FSA and how, through a process of state reduction, we can obtain an optimal representation. This gives insights into the basic properties of the longest-pre\ufb01x match problem.<\/p>\n","protected":false},"excerpt":{"rendered":"
An IP route lookup can be considered as a string matching problem on the destination address. Finite State Automata (FSA) are a \ufb02exible and ef\ufb01cient way to match strings. This paper describes how a routing table can be encoded as an FSA and how, through a process of state reduction, we can obtain an optimal 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