With the development of the communication industry and the informatization of the national economy, the managed ring network switch market has grown steadily. It is cost-effective, highly flexible, relatively simple and easy to implement. Ethernet technology has become an important LAN network technology today, and managed ring switches have become popular switches.
Switches work at layer 2 (the data link layer) of the OSI reference model. When each interface is successfully connected, the CPU inside the switch will form a MAC table by mapping the MAC address to the interface. In future communications, packets destined for that MAC address will only be sent to its corresponding interface, not all interfaces. Therefore, the managed ring network switch can be used to divide the broadcast of the data link layer, that is, the collision domain; but it cannot divide the broadcast of the network layer, that is, the broadcast domain.
Managed ring switch switches have a very high bandwidth reverse bus and internal switch matrix. All interfaces of the switch are connected to this reverse bus. After the control circuit receives the packet, the processing interface will look up the address comparison table in memory to determine the NIC (network card) of the target MAC (the hardware address of the network card). On which interface the packet is quickly transmitted to the destination interface through the internal switch fabric. If the destination MAC does not exist, broadcast it to all interfaces. After the switch receives a response from the interface, it will “learn” the new MAC address and add it to the internal MAC address table. Using switches can also “segment” the network. By comparing IP address tables, managed ring switches allow only necessary network traffic to pass through the switch. Switch filtering and forwarding can effectively reduce the collision domain.