Cluster is to manage multiple interconnected (cascaded or stacked) switches as a logical device. In a cluster, there is generally only one management switch, called the command switch, which can manage several other switch. Cluster is to manage multiple interconnected (cascaded or stacked) switches as a logical device. In a cluster, there is generally only one management switch, called the command switch, which can manage several other switches. In the network, these switches only need to occupy one IP address (only required by the command switch), saving valuable IP. Cascading means that two or more switches are connected in a certain way. Multiple switches can be cascaded in various ways as needed. In a larger local area network such as a campus network (campus network), a plurality of switches generally form a cascaded structure of a bus topology, a tree topology, or a star topology according to their perform. Stacking refers to combining more than one switch to work together to provide as many ports as possible in a limited space. Multiple switches are stacked to form a stacking unit. There is a parameter of “maximum stackable number” in the performance index of stackable switches, which refers to the maximum number of switches that can be stacked in a.