Filter based longest prefix match algorithm

The invention claims a method and the IP address search system of longest prefix matching. The method and system for specifically to IPv6, comprising a cover (LPM) is a IP address search longest prefix. The invention claims a method for is a filter end of LPM. The embodiment of this invention, and all address to filtrations further of the other filtering. Compares the existing computing method, a filter operation the number of the secondary to the LPM algorithm quicker and realizing and a lower clamp. Also described with a displaced filter ideally shape; the IP address is from flexible withdrew fixing measuring window sliding Piece.