Gigabit switch with frame forwarding and address learning

摘要

A network switch for network communications is disclosed. The switch includes a first data port interface supporting at least one data port transmitting and receiving data at a first data rate and a second data port interface supporting at least one data port transmitting and receiving data at a second data rate. The switch also has a CPU interface configured to communicate with a CPU and a memory management unit for communicating data from at least one of the first and second data port interfaces and a memory. It also includes a communication channel for communicating data and messaging information between the first and second data port interfaces and the memory management unit and a plurality of lookup tables, including an address resolution lookup table and a VLAN table. One of the first or second data port interfaces is configured to determine an egress ports or egress ports for an incoming data packet from a search of the address resolution lookup table and the VLAN table using a VLAN ID derived from the incoming data packet. Methods directed to forwarding data packet and learning absent addresses are also disclosed.