Overview of JUNOS CLI Operational Mode Commands

This topic provides an overview of JUNOS operational mode commands, and contains the following sections:

• CLI Command Categories
• Commonly Used Operational Mode Commands

CLI Command Categories

When you log in to a device running JUNOS software and the CLI starts, 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 Controlling the CLI Environment.
• Commands for monitoring and troubleshooting—The following commands display information and statistics about the software and test network connectivity. Detailed command descriptions are provided in the JUNOS Interfaces Command Reference.
  • 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, system alarms, and the chassis.
  • test—Test the configuration and application of policy filters and autonomous system (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 System Basics and Services Command Reference.
• 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 System Basics and Services Command Reference.
• Commands for restarting software processes—The commands in the restart hierarchy restart the various JUNOS software processes, including the routing protocol, interface, and Simple Network Management Protocol (SNMP). For information about these commands, see the JUNOS System Basics and Services Command Reference.
• 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 System Basics and Services Command Reference.
• A command—start—to exit the CLI and start a UNIX shell. For information about this command, see the JUNOS System Basics and Services Command Reference.
• 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 Using Commands and Statements to Configure a Device Running JUNOS Software.
• A command—quit—to exit the CLI. For information about this command, see the JUNOS System Basics and Services Command Reference.
• For more information about the CLI operational mode commands, see the JUNOS Interfaces Command Reference and the JUNOS System Basics and Services Command Reference.

Commonly Used Operational Mode Commands

Table 8 lists some operational commands you may find useful for monitoring router operation. For a complete description of operational commands, see the JUNOS command references.

Table 8: Commonly Used Operational Mode Commands

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