Basic Principle Of Two - Layer Switch
As the name implies, the so-called layer 2 switch is based on the layer 2 information of the Ethernet frame, that is, the MAC address and the destination MAC address of the frame. After receiving an Ethernet frame, the switch forwards the message from the correct port according to the frame's purpose, which is called layer 2 switch, and the corresponding device is called layer 2 switch. The most important difference between the layer 2 switch and the layer 2 switch is that the transparent bridge has only two ports, and the number of the switch ports is far more than two. At present, all switches use hardware to realize their forwarding process. This device is generally called ASIC(Application Specific Integrated Circuit, also known as switching engine. For layer 2 switches, a layer 2 forwarding table, L2FDB(Layer 2 forwarding database, will be maintained. The main content of the table item is the corresponding relationship between the MAC address and the switch port.