Monitor and Perform System Management Functions

Table 6 summarizes the command-line interface (CLI) commands you can use to perform system management functions and monitor system management functions. In the table, the commands are grouped by functionality. In the remainder of this chapter, the commands are explained alphabetically.

Table 6: Commands for Monitoring and Performing System Management

Task	Task or Information to Monitor	Command
Software Version	Versions of software running on the router.	show version
	JUNOS software extensions.	show system software
Router Up Time	Current time and how long the router has been operational.	show system uptime
Configuration	Current running system configuration.	show configuration
	Verify the syntax of a configuration file.	test configuration
	Display information about a pending commit.	show system commit
	Clear a pending commit.	clear system commit
User Account Information	Users currently logged into the router.	show system users
	Login permissions for the current user.	show cli authorization
Log Files and Recent History	Log files and their contents and recent user logins.	show log
	Monitor the contents of log files.	monitor
	Monitor network traffic	ping
	Recent CLI history.	show cli history
Remote System Reachability	Check host reachability and network connectivity.	ping
	Check the reachability of a remote ATM node.	ping atm
	Check the operability of an LSP's data plane.	ping mpls
	Check the reachability of a remote VPN node.	ping vpn-interface
	Determine the route to a network system.	traceroute
	Network connection information.	show system connections
Connecting to Remote Systems	Open secure shell connections between the local router and a remote system.	ssh
	Open a telnet session to a remote system.	telnet
Network Time Protocol	NTP peers and their state.	show ntp associations
	NTP peer variables.	show ntp status
Packet Forwarding Engine	Packet Forwarding Engine FPC.	show pfe fpc
	Packet Forwarding Engine information.	show pfe terse
	Packet Forwarding Engine next-hop.	show pfe next-hop
	Packet Forwarding Engine route.	show pfe route
	Packet Forwarding Engine SCB.	show pfe scb
	Packet Forwarding Engine SFM.	show pfe sfm
	Packet Forwarding Engine statistics.	show pfe statistics dma show pfe statistics error show pfe statistics ip show pfe statistics notification show pfe statistics pio show pfe statistics traffic
System Software	System memory and buffer usage information.	show system buffers
	Software processes running on the router.	show system processes
	Systemwide protocol-related statistics.	show system statistics
	Statistics about amount of free disk space in the router's file systems.	show system storage
	Routing, routing protocol, and interface tasks that are currently running.	show task
	JUNOS kernel memory usage.	show system virtual-memory
	State and checksum value for files in a file system.	show system audit
Hostname Lookup	Hostname lookup using DNS.	show host
ARP Table	Contents of the ARP table.	show arp
	Zero the contents of the ARP table.	clear arp
Stop and Restart Processes and Software	Restart a JUNOS software process.	restart
	Install software bundles or packages onto the router.	request system software add
	Remove software bundles or packages from the router.	request system software delete
	Rollback to previously installed version.	request system software rollback
	Check candidate software compatibility against the current configuration.	request system software validate
	Stop the routing software.	request system halt
	Reboot the routing software.	request system reboot
	Pending system halts or reboots.	show system reboot
	Clear a pending system halt or reboot.	clear system reboot
	Back up the file systems on the router.	request system snapshot
Manipulate Files	Copy a file to another location on the router or to another system on the network.	file copy
	List files and directories on the router.	file list
	Display the contents of a file.	file show
	Rename a file on the router.	file rename
	Delete a file on the router.	file delete
Create a Shell	Create a UNIX-level shell.	start
Systemwide Messages	Send messages to users currently logged into the router.	request message
System Boot Messages	Display boot messages.	show system boot-messages
Information for Customer Support	Collect system information before contacting customer support.	request support information
Exit from CLI	Exit from the CLI to a UNIX shell.	quit