Basic VLAN configuration on a Juniper switch

 Topology

1. Jump into the configuration mode.

                      root@vqfx-re> configure 

                      Entering configuration mode

                      {master:0}[edit]

                       root@vqfx-re# 

2. Create vlans.

                      root@vqfx-re# set vlans internal vlan-id 50

3. Assign interfaces to the vlan.

                      root@vqfx-re# set interfaces xe-0/0/4 unit 0 family ethernet-switching interface-mode access vlan members internal

Note: Default interface mode is 'access' if not specified.

4. Commit the changes.

                      root@vqfx-re# commit

5. Verify the changes made.

                      root@vqfx-re> show vlans 

Routing instance     VLAN name            Tag          Interfaces

default-switch          default            1        

default-switch          internal           50           xe-0/0/4.0*

Different CLI modes

% - shell mode

> - Operational mode

# - Configuration mode

To use the operational command at the configuration mode use "run" at the beginning of the command

Example: root@vqfx-re#run show vlans