IP Route Lookups as String Matching

IEEE LCN'2000 |

Organized by IEEE

An IP route lookup can be considered as a string matching problem on the destination address. Finite State Automata (FSA) are a flexible and efficient 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-prefix match problem.