3 Layer3 packet forwarding handling method and apparatus in gigabit Ethernet based router

摘要

PURPOSE: A parallel process type 3-layer packet forwarding processing method in a gigabit Ethernet-based router and an apparatus thereof are provided to simplify a circuit and save a cost by independently perform a parallel process in the same buffer using a dual port memory as the buffer when temporally storing a packet and correcting header information and simultaneously processing the packet by a look-up result without a processor. CONSTITUTION: A packet routing central controller(203) controls an entire routing procedure irrespective of a processor. A look-up controller(204) searches a look-up to a destination IP address through a look-up table(205) by the request of the packet routing central controller(203). The look-up table(205) stores information to an IP address. A packet write controller(202) designates a storing point of an input packet. A packet correction controller(206) designates a packet correction position by a look-up result. A packet read controller(207) designates a packet address read to a host. A pointer intervener(208) intervenes between a correction write point and a read point inputted from the packet read controller(207). A buffer(209) stores an inputted packet, and is a dual port memory for performing a read and write of a common data in an inter-different port.