Overview of Junos OS CLI Operational Mode Commands
This topic provides an overview of Junos OS CLI operational mode commands.
CLI Command Categories
When you log in to a device running Junos OS and the CLI starts, there are several broad groups of CLI commands:
Commands for controlling the CLI environment—Some set commands in the set hierarchy configure the CLI display screen. For information about these commands, see Understanding the Junos OS CLI Modes, Commands, and Statement Hierarchies. For information about CLI commands, including usage and syntax, see the CLI Explorer
Commands for monitoring and troubleshooting—The following commands display information and statistics about the software and test network connectivity.
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..
Commands for copying files—The copy command copies files from one location on the router or switch to another, from the router or switch to a remote system, or from a remote system to the router or switch..
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. .
A command—quit—to exit the CLI. .
For more information about the CLI operational mode commands, see the CLI Explorer.
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.
The QFX3500 switch does not support the IS-IS, OSPF, BGP, MPLS, and RSVP protocols.
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
Adjacent routers or switches
show isis adjacency
Display standard information about OSPF neighbors
show ospf neighbor
Display information about BGP neighbors
show bgp neighbor
Status of interfaces on which MPLS is running
show mpls interface
Configured LSPs on the router or switch, as well as all ingress, transit, and egress LSPs
show mpls lsp
Routes that form a label-switched path
show route label-switched-path
Status of interfaces on which RSVP is running
show rsvp interface
Currently active RSVP sessions
show rsvp session
RSVP packet and error counters
show rsvp statistics