Command-Line Interface Operational Mode

When you log in to the router and the command-line interface (CLI) starts, you are at the top level of operational mode. At this level, there are a number of broad groups of CLI commands:

• Commands for controlling the CLI environment—The commands in the set hierarchy configure the CLI display screen. For information about these commands, see Control the CLI Environment.
• Commands for monitoring and troubleshooting—The following commands let you display information and statistics about the software and test network connectivity. Using these commands is discussed in the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.

• clear—Clear statistics and protocol database information.
• mtrace—Trace mtrace packets from source to receiver.
• monitor—Perform real-time debugging of various software components, including the routing protocols and interfaces.
• ping—Determine the reachability of a remote network host.
• show—Display the current configuration and information about interfaces, routing protocols, routing tables, routing policy filters, and the chassis.
• test—Test the configuration and application of policy filters and AS path regular expressions.
• traceroute—Trace the route to a remote network host.

• Commands for connecting to other network systems—The ssh command opens secure shell connections, and the telnet command opens telnet sessions to other hosts on the network. For information about these commands, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
• Commands for copying files—The copy command copies files from one location on the router to another, from the router to a remote system, or from a remote system to the router. For information about these commands, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
• Commands for restarting software processes—The commands in the restart hierarchy restart the various JUNOS software processes, including the routing protocol, interface, and SNMP. For information about these commands, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
• A command—request—for performing system-level operations, including stopping and rebooting the router and loading JUNOS software images. For information about this command, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
• A command—start—to exit the CLI and start a UNIX shell. For information about this command, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management.
• A command—configure—for entering configuration mode, which provides a series of commands that configure the JUNOS software, including the routing protocols, interfaces, network management, and user access. For information about the CLI configuration commands, see Configure the Router with the CLI.
• A command—quit—to exit the CLI. For information about this command, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management..

For more information about the CLI operational mode commands, see the JUNOS Internet Software Operational Mode Command Reference: Protocols, Class of Service, Chassis, and Management and JUNOS Internet Software Operational Mode Command Reference: Interfaces.

This chapter discusses the following topics:

• Use the CLI
• Set the Current Date and Time
• Set the Date and Time from NTP Servers
• Display CLI Command History
• Monitor Who Uses the CLI