PARALLEL LOOKUP CONTROL DEVICE FOR VARIOUS SERVICE IP PACKET FORWARDING AND METHOD THEREFOR

摘要

PURPOSE: A parallel lookup control device for various service IP(Internet Protocol) packet forwarding and a method therefor are provided to prevent the performance degradation of the IP packet forwarding and improve a lookup performance as to various services. CONSTITUTION: A lookup control unit(103) has a lookup information storing unit(201) for storing information required in various service classified lookup such as an IP destination address, an IP source address, a TCP(Transmission Control Protocol) destination port number, a TCP source port number, connection information of a received packet, and VPN(Virtual Private Network) root identification information. The lookup control unit(103) has each service classified lookup comparison control unit(501-503) for obtaining information required in each service lookup from the lookup information storing unit(201) and generating a comparison control signal according to each service, and each service classified lookup identity index storing unit(504-506) for storing an identical entry index corresponding to each service classified lookup result in the each service classified lookup comparison control unit(501-503). The lookup control unit(103) has an index priority comparing unit(510) for comparing the entry indexes stored in the service classified lookup identity index storing units(504-506) according a service priority, and a label table index generating unit(511) for generating a label table index according to the selected priority. A lookup engine(104) has each service classified forwarding table(507-509) for storing each service classified lookup information.