PACKET PROCESSING DEVICE AND A METHOD OF A LINE CARD CONNECTED TO AN ETHERNET SWITCH, ESPECIALLY CONCERNED IN REALIZING A FASTER SPEED WHEN PROCESSING A PACKET WITH A SELF LINE CARD

摘要

PURPOSE: A packet processing device and a method of a line card connected to an Ethernet switch are provided to decide whether to output a packet to a port of a self line card before passing the packet to an Ethernet switch, thereby immediately sending the packet to a terminal through the line card port without passing to the Ethernet switch when the packet is to be outputted to the port. CONSTITUTION: An FPGA(104) comprises as follows. A transmit physical layer interface(1041) interfaces a packet inputted from an ingress network processor. A transmit FIFO(1042) receives the packet to store the packet. A controller(1043) determines where to forward the stored packet. A receive FIFO 1(1045) stores the packet if the packet is determined to be outputted to a self line card port. If the packet is determined to be outputted to other line card port, a transmit link layer interface(1044) interfaces the packet to a switch card. A receive link layer interface(1047) interfaces the packet inputted from the switch card. A receive FIFO 2(1048) stores a packet transmitted from other line card. A receive 1 physical interface(1046) and a receive 2 physical layer interface(1049) interface the packet to output the interfaced packet.