5-15 CLI ConfigurationWhen configuring CLI, go to these sections for information you are interested in:z Introduction to the CLIz Command Hierarchyz CLI Viewsz CLI FeaturesIntroduction to the CLIA command line interface (CLI) is a user interface to interact with a switch. Through the CLI on a switch,a user can enter commands to configure the switch and check output information to verify theconfiguration. Each 3com switch 4210 provides an easy-to-use CLI and a set of configurationcommands for the convenience of the user to configure and manage the switch.The CLI on the 3com switch 4210 provides the following features, and so has good manageability andoperability.z Hierarchical command protection: After users of different levels log in, they can only usecommands at their own, or lower, levels. This prevents users from using unauthorized commandsto configure switches.z Online help: Users can gain online help at any time by entering a question mark (?).z Debugging: Abundant and detailed debugging information is provided to help users diagnose andlocate network problems.z Command history function: This enables users to check the commands that they have latelyexecuted and re-execute the commands.z Partial matching of commands: The system will use partially matching method to search forcommands. This allows users to execute a command by entering partially-spelled commandkeywords as long as the keywords entered can be uniquely identified by the system.Command HierarchyCommand Level and User Privilege LevelTo restrict the different users’ access to the device, the system manages the login users and all thecommands by their privilege levels.All the commands and login users are categorized into four levels, which are visit, monitor, system, andmanage from low to high, and identified respectively by 0 through 3. After users at different privilegelevels log in, they can only use commands at their own, or lower, levels. For example, level 2 users canonly use level 0 through level 2 commands, not level 3 commands.Command levelBased on user privilege, commands are classified into four levels, which default to:z Visit level (level 0): Commands at this level are mainly used to diagnose network, and they cannotbe saved in configuration file. For example, ping, tracert and telnet are level 0 commands.
