JUNOS For Dummies

From JUNOS For Dummies by Michael Bushong, Cathy Gadecki, Aviva Garrett

JUNOS is complete network management software that compares quite favorably to Cisco IOS. If you’re making the switch to JUNOS, knowing how the JUNOS commands compare to IOS commands when it comes to systems management, interfaces, and routing protocols is a must.

The Basic Differences between JUNOS and IOS

The JUNOS software command line interface (CLI) has many built-in tools to guide you while you master its commands and structure. If you already know Cisco’s IOS command language, you can anticipate many of the JUNOS software commands. JUNOS software and IOS have two fundamental differences:

JUNOS software organizes commands in a structured hierarchy as opposed to a flat file, showing the configuration and commands of each level within its own set of curly braces {}.
JUNOS software stores changes into a candidate configuration instead of immediately impacting your active configuration file. You don’t affect the active configuration until you commit the changes.

Because JUNOS doesn’t use the ip keyword in the commands, many of the show commands you already know work if you simply drop the keyword. For example, show ip route becomes show route.

Comparing JUNOS and IOS Systems' Management Commands

If you’re familiar with Cisco’s IOS and are now using JUNOS, use this table to translate IOS commands to the proper JUNOS command. Ping is the same, but otherwise, JUNOS commands tend to be a bit more long-winded.

IOS Command	JUNOS Command
clock set	set date
ping	ping
reload	request system reboot
send	request message
show clock	show system uptime
show environment	show chassis environment
show history	show cli history
show ip traffic	show system statistics
show logging	show logshow log file name
show processes	show system processes
show running config	show configuration
show tech-support	request support information
show users	show system users
show version	show version show chassis hardware
trace	traceroute

Comparing JUNOS and IOS Interface Commands

If you’re managing networks—and if you’re using JUNOS, you are—you know that networking is all about interfaces. The following table compares the interface commands you use in JUNOS to those used in Cisco IOS to help you find the right JUNOS command if you know what to do in IOS.

IOS Command	JUNOS Command
clear counters	clear interface statistics
show interfaces	show interfaces show interfaces detail show interfaces extensive
show ip interface	show interfaces show interfaces detail show interfaces extensive
show ip interface brief	show interfaces terse

Comparing JUNOS and IOS Routing Protocol Commands

Keeping routers buzzing along is a key job for any network manager. If you’re switching to JUNOS to manage your network, you can use the following table to find the right JUNOS routing protocol commands if you already know the Cisco IOS command.

IOS Command	JUNOS Command
clear arp-cache	clear arp
show arp	show arp
show ip route	show route
show ip route summary	show route summary
show route-map	show policy show policy policy-name
show tcp	show system connections
show ip ospf database	show ospf database
show ip ospf interface	show ospf interface
show ip ospf neighbor	show ospf neighbor
clear ip bgp	clear bgp neighbor
clear ip bgp dampening	clear bgp damping
show ip bgp	show route protocol bgp
show ip bgp community	show route community
show ip bgp dampened paths	show route damping decayed
show ip bgp neighbors	show bgp neighbor
show ip bgp neighbors address advertised-routes	show route advertising-protocolbgp address
show ip bgp neighbors address received-routes	show route receive-protocol bgpaddress
show ip bgp peer-group	show bgp group
show ip bgp regexp	show route aspath-regex
show ip bgp summary	show bgp summary