Electronics and Telecommunications Research Institute

Lee Hyeong Ho

Bin Yeong Yoon

Bong Wan Kim

Sang Yoon Oh

Lee Heyung Sub

A method for managing a content addressable memory (CAM) look-up table using the longest prefix matching (LPM) is provided. The method includes providing a pair of pointers per every band of data having the same prefix in length, wherein one of the pair of pointers stores the address of data having the lowest address in each band of data, and the other pointer of the pair of pointers stores the next higher address of data having the highest address in each band of data; and making a space in which data is to be added in the CAM look-up table by moving data having the addresses stored in the pair of pointers provided per each band of data that has a shorter prefix length than the prefix length of the data to be added, when data is added to the CAM look-up table. According to the method, it is possible to easily and efficiently add new data into the look-up table of the CAM.

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Daejeon, South Korea

Lee Hyeong Ho