Cisco CATALYST 2960 - CHAPTER 2; Using the Command-Line Interface; Understanding Command Modes; When you start a session on the switch, you begin in user mode, often called user EXEC mode. Only a limited subset of the commands are available in user EXEC mode. For example, most of the user EXEC commands are one-time commands, such as show commands, which show the current configuration status, and clear commands, which clear counters or interfaces. The user EXEC commands are not saved when the switch reboots.

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Catalyst 2960 Switch Command Reference
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Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
cluster enable
Related Commands Command Description
show cluster Displays the cluster status and a summary of the cluster to which the switch
belongs.