| 摘要 |
PURPOSE: A device and a method for a multi-layer parallel processing lookup in a communication system are provided to apply a CAM(Content Addressable Memory) to simultaneously and independently process the lookup of a 2-layer MAC(Medium Access Control) address and a 3-layer IP(Internet Protocol) address in order to implement a fast lookup satisfying a gigabit speed of traffic. CONSTITUTION: An MAC(Medium Access Control,41) performs protocol processing for a gigabit speed of signal received from an Ethernet physical medium, and delivers a packet frame inside a system through an inner receiving FIFO(First-In-First-Out). In a lookup control unit(42) an address recognizer(421) latches a header of a gigabit capacity of packet data frame received from the receiving FIFO of the MAC(41) in real time, to extract necessary information. A 2-layer lookup controller(422) controls a 2-layer CAM(Content Addressable Memory)(423) and searches output network information, to obtain lookup information on an MAC address processed in a 2-layer among the extracted information. A 3-layer lookup controller(424) controls a 3-layer CAM(425) and searches output network information, to obtain lookup information on an IP(Internet Protocol) address processed in a 3-layer among the extracted information. A forwarding transmission unit(426) transmits the output network information obtained from the 2-layer and 3-layer lookup controllers(422,424) to a forwarding unit(43). |
