1 CLI OVERVIEWIntroduction to the CLI A 3Com series Ethernet switch provides a command line interface (CLI) andcommands for you to configure and manage the Ethernet switch. The CLI isfeatured by the following:■ Commands are grouped by levels. This prevents unauthorized users fromoperating the switch with relevant commands.■ Users can gain online help at any time by entering the question mark “?”.■ Commonly used diagnosing utilities (such as Tracert and Ping) are available.■ Debugging information of various kinds is available.■ The command history is available. You can recall and execute a historycommand easily.■ You can execute a command by only entering part of the command in the CLI,as long as the keywords you input uniquely identify the corresponding ones.CommandLevel/Command ViewTo prevent unauthorized accesses, commands are grouped by command levels.Commands fall into four levels: visit, monitor, system, and manage:■ Visit level: Commands at this level are mainly used to diagnose network andchange the language mode of user interface, and cannot be saved inconfiguration files. For example, the ping, tracert, and language-modecommands are at this level.■ Monitor level: Commands at this level are mainly used to maintain the systemand diagnose service problems, and cannot be saved to configuration files. Forexample, the display and debugging commands are at this level.■ System level: Commands at this level are mainly used to configure services.Commands concerning routing and network layers are at this level. You canutilize network services by using these commands.■ Manage level: Commands at this level are associated with the basic operationof the system, and the system supporting modules. These commands providesupports to services. Commands concerning file system, FTP, TFTP, usermanagement, and level setting are at this level.Users logging into a switch also fall into four levels, each of which correspondingto one of the above command levels. Users at a specific level can only use thecommands of the same level and those of the lower levels.
