You can enable stacking through the CLI. A node that is booted with stacking enabled is said to be running in stacking mode.
If no parameters are specified, stacking is enabled on all nodes in the stack topology.
If the node-address parameter is present, stacking is enabled on the node with the specified node-address. This is the MAC address assigned to the stackable switch by the factory.
A node that is running in stacking mode attempts to join the active topology. If successful, it then negotiates a node role with the other nodes in the stack and becomes an operational node in the stack according to its role. The master node's configuration is applied to the node.