![]() (4) Broadcast frames and multicast frames are forwarded to all ports. ![]() ![]() ![]() (3) If the destination MAC address in the data frame is not in the MAC address table, it will be forwarded to all ports. (2) The switch compares the destination MAC address in the data frame with the established MAC address table to determine which port to forward. (1) The switch establishes the mapping between the address and the switch port according to the source MAC address in the received data frame, and writes it into the MAC address table. When a certain data frame needs to be forwarded, the switch searches the MAC address table according to the destination MAC address of the data frame to obtain the port corresponding to the address, that is, to know which port of the switch the device with the MAC address is connected to, and then the switch Forward the data frame from this port. The MAC address table records the corresponding information of all MAC addresses in the network and each port of the switch. The switch can realize this function because there is a MAC address table inside the switch. When the switch receives data, it checks its destination MAC address, and then forwards the data from the interface where the destination host is located. So, can we use layer 3 switch to replace router? Let’s discuss. We know that both of layer 3 switch and router provide function of routing.
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