1. Introduction to the Junos Operating System
Chapter 3: User Interface Options

2. Chapter Objectives
After successfully completing this chapter you will be able to:
Describe some user interface options for devices running the Junos operating system
Demonstrate the Junos CLI and its features

3. Agenda: User Interface Options
The Junos CLI
CLI Basics
Operational Mode
Configuration Mode

4. Common User Interface Options
Junos CLI
Text-based command shell
Accessible through the console port using a terminal emulation program
Uses RJ Bps, 8/1/N (not configurable)
Also accessible through network ports using an access management protocol such as Telnet or SSH
Requires network interface and related service configuration
Many Junos devices include a dedicated management Ethernet interface used for out-of-band access
J-Web
Web-based graphical user interface
Accessible through an HTTP-enabled or HTTPS-enabled browser

5. Agenda: User Interface Options
The Junos CLI
CLI Basics
Operational Mode
Configuration Mode

6. Logging In When logging in:
Nonroot users are placed into the CLI automatically
The root user must start the CLI from the shell
Remember to exit the root shell after logging out of the CLI!
router (ttyu0)
login: user
Password:
--- JUNOS 12.1R1.9 built :12:49 UTC
router (ttyu0)
login: root
Password:
--- JUNOS 12.1R1.9 built :12:49 UTC cli
Shell Prompt
CLI Prompt

7. CLI Modes Operational mode: Configuration mode:
Monitor and troubleshoot the software, network connectivity, and hardware
Configuration mode:
Configure the device, including interfaces, protocols, user access, and system hardware properties
The > character identifies operational mode
[edit]
The # character identifies configuration mode

8. Context-Sensitive Help
Type ? anywhere on the command line to get help: ?
Possible completions:
clear Clear information in the system
configure Manipulate software configuration information
file Perform file operations
help Provide help information
. . .
clear ?
amt Show AMT Protocol information
arp Clear address resolution information
auto-configuration Clear auto-configuration action
bfd Clear Bidirectional Forwarding Detection information

9. Topical Help help topic provides topical information:
help topic interfaces ?
Possible completions:
accept-data Accept packets destined for virtual address
accept-source-mac Policers for specific source MAC addresses
access-profile-chap CHAP profile associated with physical interface
accounting Packet counting for transit traffic
accounting-profile Accounting profile
acfc Compression of Address and Control fields in PPP header
...
help topic interfaces address
Configuring the Interface Address
You assign an address to an interface by specifying the address when
configuring the protocol family. For the inet family, configure the
interface's IP address. For the iso family, configure one or more
addresses for the loopback interface. For the ccc, tcc, mpls, tnp, and
vpls families, you never configure an address.

10. Help with Configuration Syntax
help reference offers configuration syntax help:
help reference interfaces address
address
Syntax
address address {
arp ip-address (mac | multicast-mac) mac-address <publish>;
broadcast address;
...
Hierarchy Level
[edit interfaces interface-name unit logical-unit-number family family],
[edit logical-routers logical-router-name interfaces interface-name unit
logical-unit-number family family]

11. Command and Variable Completion
Use the Spacebar to complete commands:
Use the Tab key to complete commands and variables:
sh<space>ow i<space>
'i' is ambiguous.
Possible completions:
iccp Show Inter Chassis Control Protocol...
igmp Show Internet Group Management Protocol...
igmp-snooping Show IGMP snooping information
interfaces Show interface information
ipv Show IP version 6 information
isdn Show Integrated Services Digital
isis Show Intermediate System-to-Intermediate...
show i
Press the Spacebar to complete a command
[edit policy-options]
show policy-statement t<tab>his-is-my-policy
then accept;
Press Tab to complete assigned variables

12. Editing Command Lines Emacs-style editing sequences are supported:
A VT100 terminal type also supports the Arrow keys
show interfaces
Ctrl+b
Ctrl+a
Ctrl+f
Ctrl+e
Keyboard Sequence
Cursor Position

13. Using | (Pipe) Use | (pipe) to filter and manipulate command output:
show route | ?
Possible completions:
count Count occurrences
display Show additional kinds of information
except Show only text that does not match a pattern
find Search for first occurrence of pattern
hold Hold text without exiting the --More-- prompt
last Display end of output only
match Show only text that matches a pattern
no-more Don't paginate output
request Make system-level requests
resolve Resolve IP addresses
save Save output text to file
trim Trim specified number of columns from start of line

14. Agenda: User Interface Options
The Junos CLI
CLI Basics
Operational Mode
Configuration Mode

15. CLI Operational Mode
Execute operational mode commands to monitor and control the operation of devices running the Junos OS
Hierarchy of commands
Example: show ospf interface
Less Specific
More Specific
clear
configure
help
monitor
set
show …
arp
configuration
ospf
version … …
database
interface
neighbor

16. Operational Mode Capabilities?
Possible completions:
clear Clear information in the system
configure Manipulate software configuration information
file Perform file operations
help Provide help information
load Load information from file
monitor Show real-time debugging information
mtrace Trace multicast path from source to receiver
op Invoke an operation script
ping Ping remote target
quit Exit the management session
request Make system-level requests
restart Restart software process
save Save information to file
set Set CLI properties, date/time, craft interface message
show Show system information
ssh Start secure shell on another host
start Start shell
telnet Telnet to another host
test Perform diagnostic debugging
traceroute Trace route to remote host

17. Agenda: User Interface Options
The Junos CLI
CLI Basics
Operational Mode
Configuration Mode

18. Active Versus Candidate Configuration
Batch configuration model:
Must commit configuration changes
Active configuration:
Current operational configuration
Boot-up configuration
Candidate configuration:
A working copy for configuration changes
Initialized with the active configuration
Becomes active configuration upon commit

19. Overview: The Life of a Configuration File
commit
rollback n
Candidate
Configuration
Active 1 2
... 49
configure
Bit Bucket

20. Entering Configuration Mode (1 of 2)
Type configure at the operational mode prompt to enter configuration mode:
Use configure exclusive to exclude other users from editing the configuration
Any uncommitted changes are discarded when users exit:
configure
Entering configuration mode
[edit]
configure exclusive
warning: uncommitted changes will be discarded on exit
Entering configuration mode
[edit]

21. Entering Configuration Mode (2 of 2)
Use configure private to allow users to edit private copies of candidate configuration concurrently
When users issue a commit, their private changes merge back into the global configuration
Any uncommitted changes are discarded when users exit
If two users make competing changes, the first user’s commit succeeds, and the second user receives a warning
The second user must issue a second commit to activate the change
configure private
warning: uncommitted changes will be discarded on exit
Entering configuration mode
Users currently editing the configuration:
nancy terminal p0 (pid 9935) on since :11:22 UTC
private [edit]
[edit]
Allows other users to edit private copies of the candidate configuration

22. Configuration Statement Hierarchy
[edit]
edit protocols ospf area 51 stub
[edit protocols ospf area stub]
[edit]
Less Specific
chassis
interfaces
protocols
services
system …
bgp
isis
mpls
ospf
pim
rip
rsvp
vrrp …
area area_id
graceful-restart
overload
traffic-engineering …
More Specific
area-range area_range
interface …
nssa
stub

23. Configuration File Is Hierarchical
Enter CLI commands without curly brackets:
[edit system]
set services web-management http port 8080
The result is a hierarchical configuration file, complete with curly brackets
show services
web-management {
http {
port 8080; }

24. Moving Between Levels (1 of 6)
edit functions like a change directory command:
[edit]
edit protocols ospf area 51 stub
[edit protocols ospf area stub]
[edit]
chassis
interfaces
protocols
services
system …
bgp
isis
mpls
ospf
pim
rip
rsvp
vrrp …
area area_id
graceful-restart
overload
traffic-engineering …
area-range area_range
interface
nssa
stub …

25. Moving Between Levels (2 of 6)
up moves up one level in the hierarchy:
[edit protocols ospf area stub] up
[edit protocols ospf area ]
[edit]
chassis
interfaces
protocols
services
system …
bgp
isis
mpls
ospf
pim
rip
rsvp
vrrp …
area area_id
graceful-restart
overload
traffic-engineering …
area-range area_range …
interface
nssa
stub

26. Moving Between Levels (3 of 6)
up n moves up n levels in the hierarchy:
[edit protocols ospf area ]
up 2
[edit protocols]
[edit]
chassis
interfaces
protocols
services
system …
bgp
isis
mpls
ospf
pim
rip
rsvp
vrrp …
area area_id
graceful-restart
overload
traffic-engineering …
area-range area_range
interface
nssa
stub …

27. Moving Between Levels (4 of 6)
top moves to the top of the hierarchy:
[edit protocols ospf area stub]
top
[edit]
[edit]
chassis
interfaces
protocols
services
system …
bgp
isis
mpls
ospf
pim
rip
rsvp
vrrp …
area area_id
graceful-restart
overload
traffic-engineering …
area-range area_range
interface
nssa
stub …

28. Moving Between Levels (5 of 6)
exit moves to the previous, higher level in hierarchy:
[edit protocols ospf]
edit area 51 stub
[edit protocols ospf area stub]
exit
[edit]
chassis
interfaces
protocols
services
system …
bgp
isis
mpls
ospf
pim
rip
rsvp
vrrp …
area area_id
graceful-restart
overload
traffic-engineering …
area-range area_range …
interface
nssa
stub

29. Moving Between Levels (6 of 6)
Summary of moving between levels:
edit functions like a CD command
up moves up one level
up n moves up n levels
top moves to the top of the hierarchy
exit moves to the previous, higher level in the hierarchy or exits configuration mode if at the top level of the hierarchy
[edit]
edit protocols ospf area 51 stub
[edit protocols ospf area stub] up
[edit protocols ospf area ]
up 2
[edit protocols]
top
exit
The configuration has been changed but not committed
Exit with uncommitted changes? [yes,no] (yes)

30. Adding Configuration Statements
Use set to add configuration statements:
[edit system services]
show
ssh;
telnet;
set ftp
ftp;
FTP service added

31. Removing Configuration Statements
Use the delete command to remove statements
Removes everything from the specified hierarchy down
[edit system services]
show
ftp;
ssh;
telnet;
delete telnet
Telnet service removed

32. Test Your Knowledge
Pop quiz: You just disabled an interface with a set interface interface-name disable statement. How do you re-enable this interface?

33. Helpful Configuration Mode Commands (1 of 2)
Commands to aid in configuration:
rename a configuration statement
[edit]
rename interfaces ge-0/0/10 to ge-0/0/11
replace pattern of configuration statements
replace pattern ge-0/0/10 with ge-0/0/11
copy a configuration statement to another statement
copy interfaces ge-0/0/10 to ge-0/0/11

34. Helpful Configuration Mode Commands (2 of 2)
Commands to aid in configuration:
deactivate or ignore a configuration statement
[edit]
deactivate interfaces ge-0/0/10
insert a configuration statement in another location
[edit policy-options policy-statement test]
insert term three before term two
annotate a comment to a configuration statement
[edit system]
annotate name-server “adding new name servers”

35. Viewing the Candidate Configuration
[edit]
show system services
ssh;
web-management {
http {
port 8080; }
edit system services
[edit system services]
show
You can display the portions that concern you from the root of the hierarchy…
…or use edit to park yourself at a specific subhierarchy
Hint: To view the set commands used to build the configuration, use the show | display set command.

36. Committing a Configuration (1 of 2)
Use commit to activate configuration changes:
If multiple REs are installed, use commit synchronize
Use commit check to confirm syntax:
Use commit confirmed to temporarily activate:
[edit]
commit
commit complete
[edit]
commit check
[edit interfaces ge-0/0/10 unit 0]
'family'
When ethernet-switching family is configured on an interface, no other family type can be configured on the same interface.
error: configuration check-out failed
[edit]
commit confirmed
commit confirmed will be automatically rolled back in 10 minutes unless confirmed
commit complete

37. Committing a Configuration (2 of 2)
Use commit at to schedule a future commit:
Use commit comment to add comments:
Use commit and-quit to save time:
[edit]
commit at 21:00:00
configuration check succeeds
commit at will be executed at :00:00 UTC
Exiting configuration mode
[edit]
commit comment "Changed OSPF configuration"
commit complete
show system commit
:32:42 UTC by user via cli
Changed OSPF configuration …
[edit]
commit and-quit
commit complete
Exiting configuration mode

38. Comparing Configuration File Differences
Compare candidate and active configurations:
Compare active and historical configurations:
Compare arbitrary files:
[edit system services]
show | compare
+ ftp;
- telnet;
show configuration | compare rollback number
show configuration | compare filename
file compare files filename_1 filename_2

39. Backing Out of Configuration Changes
Use rollback to restore a previous configuration:
rollback (or rollback 0 ) resets the candidate configuration to the currently active configuration
rollback 1 loads the previously active configuration
rollback n loads referenced rollback version
Modifies only the candidate configuration
Do not forget to commit the changes!
[edit]
rollback ?
Possible completions:
<[Enter]> Execute this command
:55:48 UTC by user via cli
:16:27 UTC by lab via cli
...
:11:00 UTC by lab via cli

40. Review: The Life of a Configuration File
commit
rollback n
Candidate
Configuration
Active 1 2
... 49
configure
Bit Bucket

41. Saving Configuration Files
Use save to save the current configuration:
Saves only from the current hierarchy down
Saves to user’s working directory by default
You can also specify a full path and filename or a URL (FTP and SCP)
[edit]
save filename
Wrote 101 lines of configuration to 'filename'
[edit]
save path/filename
save
save

42. Loading Configuration Files
Use the load command to load a configuration file:
Use terminal to input from terminal capture buffer:
Use relative to load from current configuration hierarchy:
Use commit to activate the candidate configuration
[edit]
load ?
Possible completions:
factory-default Override existing configuration with factory default
merge Merge contents with existing configuration
override Override existing configuration
patch Load patch file into configuration
replace Replace configuration data
set Execute set of commands on existing configuration
update Update existing configuration
load (replace | merge | override) terminal
load (replace | merge) (filename | terminal) relative

43. Using the run Command
Use run to execute operational mode CLI commands while in configuration mode
Can save time when testing the effects of a recent change
[edit interfaces ge-0/0/12]
set unit 0 family inet address /16
commit
commit complete
run ping count 1
PING ( ): 56 data bytes
64 bytes from : icmp_seq=0 ttl=255 time=0.967 ms
ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.967/0.967/0.967/0.000 ms
Use run to test configuration changes without leaving configuration mode

44. Summary In this chapter, we:
Described some user interface options for Junos devices
Demonstrated the Junos CLI and its features

45. Review Questions Which modes exist within the Junos OS?
Which operations can be performed in each mode?
Which keystrokes complete a system command and a user-defined variable?
Which command provides the quickest method of returning to the top of the hierarchy?
What is the difference between the active and candidate configurations?
Which command displays the differences between the candidate and active configurations?

46. Lab 1: The Junos CLI
Become familiar with the Junos CLI.