Overview of Junos OS CLI Operational Mode Commands
This topic provides an overview of Junos OS CLI operational mode commands.
CLI Command Categories
There are several broad categories of CLI commands, including:
Operational mode commands for monitoring and troubleshooting—The following commands perform functions related to information and statistics about the software and to test network connectivity.
clear—Clear statistics and protocol database information.
file—Perform file operations.
mtrace—Trace a multicast path 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 restarting software processes—The commands in the restart hierarchy restart the various Junos OS processes, including the routing protocol, interface, and SNMP.
A command—request—for performing system-level operations, including stopping and rebooting the router or switch and loading Junos OS images.
A command—start—to exit the CLI and start a UNIX shell. For information about this command, see the CLI Explorer.
A command—configure—for entering configuration mode, which provides a series of commands that configure Junos OS, including the routing protocols, interfaces, network management, and user access.
For more information about the CLI operational mode commands, see the CLI Explorer. Alternatively, you can also enter ? at the operational mode command prompt to view a list of available commands.
Commonly Used Operational Mode Commands
The following table lists some operational commands you may find useful for monitoring router or switch operation. For a complete description of operational commands, see the Junos OS command references.
Table 1: Commonly Used Operational Mode Commands
Items to Check
Versions of software running on the router or switch
Contents of the log files
Log files and their contents and recent user logins
Host reachability and network connectivity
Route to a network system
Current system configuration
List of files and directories on the router or switch
Contents of a file
Detailed information about interfaces
Chassis alarm status
show chassis alarms
Information currently on craft display
show chassis craft-interface
Router or switch environment information
show chassis environment
show chassis hardware
Routing table information
Information about entries in the routing tables
Forwarding table information
Information about data in the kernel’s forwarding table
show route forwarding-table