Juniper basics

Written by Arnaud 07 august 2014 no comments

I choosed Configuring Junos Basics, and Junos for IOS Engineers.

Now, let's get a Switch! for my first try I had 2 QFX5100 : https://twitter.com/afenioux/status/496269731171946497

The default login is "root" and there is no password, once logged in, type "cli" to enter into the Juniper CLI.

Show status and desc of the interfaces :
show interfaces descriptions

Enter "config mode" :

edit

Show binding with agregated ethernet interface (PortChannel), we use "run" in edit mode (like a cisco "do"):

run show interfaces terse

Show config in indented mode

show configuration

Show config as you would type it:

show configuration | display set

You can double pipe and use match (cisco "include"):

show configuration | display set | match interface

Set a description to an interface, and show its config:
edit interface xe-0/3/6 set description "my INT description" show

Shutdown an interface (you are not obliged to edit into the interface mode):
set interfaces xe-0/3/2 disable

See you modifications before commiting:
show | compare

Apply your configuration changes
commit

Apply you configuration, and schedule a rollback (by default) in 10 min :
commit confirmed

Check your config before commit (or confirm commit after a "commit confirmed"):
commit check

See the configuration history:

show system commit

"deactivate" comment the config, good for tests, delete is delete :

deactivate system syslog

delete system syslog

Activate SSH to login, and set an IP on the managment interface (with a default route) :

set system services ssh

set interfaces vme unit 0 family inet address 192.168.1.100/24

set routing-options static route 0.0.0.0/0 next-hop 192.168.1.1

Show random (but usefull) tips:

help tip cli

List the Serial numbers and the type of all components (SFP / FPC (LineCard) / PFE (Switch Fabric)/ PS...):
show chassis hardware

Show optical level and power information of an optic:
show interfaces diagnostics optics xe-0/2/3

Start a shell (with your id or as root)
start shell start shell user root

Show all log (but only last lines) :
show log messages | last

enable/disable debuging (caution!) in is example we "tail" the messages logs :
monitor start messages monitor stop messages

Watch interface statistics in live :
monitor interface xe-0/3/6