Look-up engine for packet-based network

Details Look-up engine for packet-based network Look-up engine for packet-based network

H - Electricity

04

L

H04L 12/56 (2006.01) H04L 12/46 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 2179613

An arrangement is disclosed for parsing packets in a packet-based data transmission network. The packets include packet headers divided into fields having values representing information pertaining to the packet. The arrangement comprises input receiving fields from the packet headers of incoming packets, a memory for storing information related to possible values of said fields, and a device for retrieving said stored information appropriate to a received field value. The retrieving device comprises a look-up engine including at least one memory organized in a hierarchical tree structure, and a controller for controlling the operation of the memory. The arrangement is capable of performing fast look-up operations at a low cost of implementation.

L'invention concerne un système d'analyse de paquets dans un réseau de transmission de données à base de paquets. Les paquets comprennent des en-têtes de paquets divisés en champs dont les valeurs représentent des informations relatives au paquet. Le système comprend une entrée recevant des champs provenant des en-têtes des paquets entrants, une mémoire conçue pour stocker les informations relatives aux valeurs possibles desdits champs, et un dispositif conçu pour extraire lesdites informations mémorisées correspondant à une valeur de champ reçue. Le dispositif d'extraction comprend une machine de recherche comprenant au moins une mémoire organisée en une structure d'arbre hiérarchique, et un contrôleur conçu pour contrôler le fonctionnement de la mémoire. Le système peut effectuer des opérations de recherche rapides pour un faible coût de mise en oeuvre.

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