The rack-mounted three-layer switch is suitable for 19-inch standard cabinet installation. It provides a maximum of 28 connectivity ports at a height of 1U, has extreme environmental temperature adaptability and good EMC electromagnetic compatibility performance, and meets the needs of switching and routing in the construction of large and medium-sized networks. This series of products supports the ring network redundancy protocol, supports multi-ring redundancy, active-standby redundancy, and can form a redundant network system with link protection. With rich Layer 2 software features such as RSTP, MSTP, VLAN, multicast, QOS, etc. Support static routing, dynamic routing, multicast routing. Support CLI, Telnet, WEB and other management methods, and support SNMPv1/v2/v3 to meet the needs of comprehensive network management.