Juniper Day One+ QFX5120 User manual

Day One+
QFX5120
IN THIS GUIDE
Step 1: Begin | 1
Step 2: Up and Running | 7
Step 3: Keep Going | 10
Step 1: Begin
IN THIS SECTION
Meet the QFX5120 Line of Ethernet Switches | 2
Install the QFX5120 | 3
Power On | 5
In this guide, we provide a simple, three-step path, to quickly get you up and running with your new QFX5120-48 switch.
We’ve simplified and shortened the installation and configuration steps, and included how-to videos. You’ll learn how to
install an AC-powered QFX5120-48 switch in a rack, power it up, and deploy it on your network. There’s a separate Day
One+ guide for the QFX5120-32C switch (see QFX5120-32C on the Day One+ webpage). For details on installing a DC
powered QFX5120-48, see QFX5120 Switch Hardware Guide.
NOTE: Are you interested in getting hands-on experience with the topics and operations covered in this guide?
Visit Juniper Networks Virtual Labs and reserve your free sandbox today! You’ll find the Junos Day One Experience
sandbox in the stand alone category.

Meet the QFX5120 Line of Ethernet Switches
The Juniper Networks®QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches are compact, 1-U fixed configuration
switches ideal for top-of-rack and spine-and-leaf deployments. You can also use the QFX5120 line of switches for
high-density server connectivity, with an option to channelize the QSFP28 ports into multiple interfaces. In addition, you
can deploy the QFX5120 line of switches as campus distribution and core switches. Dual hot-swappable AC or DC power
supplies provide 1+1 redundancy. Five hot-swappable fan trays maintain high system availability.
The QFX5120 supports many network automation features and plug-and-play features, including zero-touch provisioning
(ZTP), making it simple to deploy on your network.
Here are some details about the port configurations for the QFX5120 line of switches:
Access PortsModel
•Two 10GbE or 1GbE SFP+ ports
•Thirty-two 100GbE or 40GbE QSFP28 ports
QFX5120-
32C
•Six 100GbE or 40GbE QSFP28 ports
•Forty-eight 10GbE or 1GbE BASE-T ports
QFX5120-
48T
•Eight 100GbE or 40GbE QSFP28 ports
•Forty-eight 25GbE, 10GbE, or 1GbE SFP28 ports
QFX5120-
48Y
•Eight 100GbE or 40GbE QSFP28 ports that support MACsec
•Forty-eight 25GbE, 10GbE, or 1GbE SFP28 ports that support MACsec
QFX5120-
48YM
2

Install the QFX5120
IN THIS SECTION
What's in the Box? | 3
What Else Do I Need? | 3
Install the QFX5120 in a Four-Post Rack | 4
What's in the Box?
•QFX5120 switch with five preinstalled fan modules and two preinstalled AC power supplies
•Two AC power cords appropriate for your geographical location
•An Ethernet cable
•An RJ-45 to DB-9 serial port adapter
•A four-post rack mounting kit that contains:
•Two front mounting brackets for mounting the switch flush with the front posts of a rack
•Twelve flat head 4x6-mm Phillips screws for attaching the front mounting brackets to the switch
•Two rear mounting brackets
The kit also contains two recessed mounting brackets for mounting the switch in a recessed position from the front
posts of a rack.
What Else Do I Need?
You’ll need to provide the following:
•Someone to help you secure the switch to the rack
•Eight mounting screws to secure the switch to the rack
•A number 2 Phillips (+) screwdriver
•An electrostatic discharge (ESD) grounding strap
•A management host such as a laptop or desktop PC
•A serial-to-USB adapter (if your laptop or desktop PC doesn’t have a serial port)
•A grounding cable: 14 AWG (1.5 mm²), minimum 90° C wire, or as permitted by the local code, with a Panduit
LCD10-10A-L or equivalent lug attached
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CAUTION: Ensure that a licensed electrician has attached the appropriate grounding lug to the
grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage
the switch.
•Two 10-32 x .25-in. screws with #10 split-lock washers to secure the grounding lug
Install the QFX5120 in a Four-Post Rack
You can mount the QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches in a four-post 19-in. rack or in a cabinet
that contains a four-post 19-in. rack. In this guide, wel walk you through how to mount the switch in a four-post rack.
1. Review the General Safety Guidelines and Warnings.
2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end to a site ESD
point.
3. Position the switch so that the AIR IN labels on the fan modules are facing the cold aisle, or the AIR OUT labels on the
fan modules are facing the hot aisle.
4. Attach the front mounting brackets to the switch.
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5. Lift the switch and position it in the rack. Line up the bottom hole in each mounting bracket with a hole in each rack
post, making sure the switch is level.
6. While you’re holding the switch in place, have a second person insert and tighten the rack mounting screws to secure
the mounting rails to the rack posts. Make sure to tighten the screws in the two bottom holes first, and then tighten
the screws in the two top holes.
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4

7. Continue holding the switch in place, and have the second person slide the rear mounting brackets into the side
mounting rails.
8. Secure the rear mounting brackets to the rack posts using the rack mount screws.
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9. Verify that the mounting brackets on each side of the rack are level.
Power On
Now that you’ve mounted your switch in the rack, you’re ready to connect it to power.
The AC-powered QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches come with two AC power supplies
preinstalled on the rear panel.
1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end to one of the
ESD grounding points on the switch.
2. Connect one end of the grounding cable to a proper earth ground, such as the rack.
3. Place the grounding lug attached to the grounding cable over the protective earthing terminal on the left panel.
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5

4. Secure the grounding lug to the protective earthing terminal using the 10-32 x .25-in. screws with #10 split-lock
washers.
5. Dress the grounding cable, and ensure that it doesn’t block access to or touch other device components, and that it
doesn’t drape where people could trip over it.
6. Ensure that the power supplies are fully inserted in the switch.
7. Connect the power cord to the AC power socket on the power supply. This step is a bit different depending on your
model.
For QFX5120-48T and QFX5120-48Y switches:
•Push the end of the retainer strip into the hole next to the power supply socket until it snaps into place. Ensure that
the loop in the retainer strip faces the power cord.
•Press the small tab on the retainer strip to loosen the loop. Slide the loop until you have enough space to insert the
power cord into the power supply socket.
•Plug in the power cord firmly into the power supply socket.
•Slide the loop toward the power supply until it is snug against the base of the power cord coupler.
•Press the tab on the loop, and draw out the loop into a tight circle.
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For QFX5120-48YM switches:
•Gently lift up the retainer clip.
•Plug in the power cord coupler firmly into the power supply socket.
•Push the retainer clip down until it is snug against the base of the power cord coupler.
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8. If the AC power source outlet has a power switch, turn it off.
6

9. Plug in the power cord to the AC power source outlet. The switch powers on as soon as you plug it in. There is no
power switch on the QFX5120.
10. If the AC power source outlet has a power switch, turn it on.
11. Verify that the AC and DC LEDs on the power supply are lit steadily green. If the fault LED (!) is lit, disconnect the
power supply from the power source, and replace the power supply (see Maintain the QFX5120 Power System in the
QFX5120 Switch Hardware Guide).
12. Repeat steps 7-11 to power on the second power supply.
Step 2: Up and Running
IN THIS SECTION
Plug and Play | 7
Customize the Basic Configuration | 7
Now that the QFX5120 is powered on, let’s do some initial configuration to get it up and running on the network. It’s
simple to configure and manage the QFX5120 using the CLI.
Plug and Play
The QFX5120 switch ships with factory-default settings that enable plug-and-play operation. These settings load as soon
as you power on the switch.
Customize the Basic Configuration
You can easily customize the factory-default configuration with just a few commands. When you commit changes to the
configuration, a new configuration file is created. This becomes the active configuration. You can always revert to the
factory-default configuration anytime you want.
7

Have the following information ready before you begin customizing the switch:
•Root authentication password
•Management port IP address
•Default gateway IP address
•DNS server IP address
1. Verify that your laptop or desktop PC has the following default serial port settings:
•Baud Rate—9600
•Data—8
•Flow Control—None
•Parity—None
•Stop Bits—1
•DCD State—Disregard
2. Connect the console port (labeled CON) on the QFX5120 switch to a serial port on your laptop or desktop PC using
the Ethernet cable and RJ-45 to DB-9 adapter. If your laptop or desktop PC doesn't have a serial port, use a serial-to-USB
adapter (not provided).
3. At the Junos OS login prompt, type root to log in. You don't need to enter a password. If the software boots before
you connect your laptop or desktop PC to the console port, you might need to press the enter key for the prompt to
appear.
login: root
4. Start the CLI.
root@:RE:0% cli
root>
5. Enter the configuration mode.
root> configure
[edit]
root#
6. Add a password to the root administration user account. Enter a plain-text password, an encrypted password, or an
SSH public key string.
8

Plain-text password:
[edit]
root# set system root-authentication plain-text-password
New password: password
Retype new password: password
Encrypted password:
[edit]
root# set system root-authentication encrypted-password encrypted-password
SSH-ECDSA password:
[edit]
root# set system root-authentication ssh-ecdsa public-key
SSH-ED25519 password:
[edit]
root# set system root-authentication ssh-ed25519 public-key
SSH-RSA password:
[edit]
root# set system root-authentication ssh-rsa public-key
7. Configure the default gateway.
[edit]
root# set routing-options static route 0/0 next-hop address
8. Configure the IP address and prefix length for the management interface on the switch.
[edit]
root# set interfaces em0 unit 0 family inet address address/prefix-length
NOTE: The management port em0 (labeled MGMT) is on the rear panel of the QFX5120-48T switch. The
management ports em0 (labeled C0) and em1 (labeled C1) are on the rear panel of the QFX5120-48Y and
QFX5120-48YM switches.
9

The management interface provides a dedicated out-of-band management channel to manage devices on the network.
If you need to configure in-band management, see Configure Junos OS on the QFX5120 in the QFX5120 Switch Hardware
Guide.
9. Configure the IP address of a DNS server.
[edit]
root# set system name-server address
10. Configure the SSH service.
[edit]
root# set system services ssh root-login allow
11. Commit the configuration to activate it on the switch.
[edit]
root# commit
12. When you’ve finished configuring the switch, exit the configuration mode.
[edit]
root# exit
root>
Step 3: Keep Going
IN THIS SECTION
What’s Next? | 11
General Information | 11
Learn With Videos | 12
Congratulations! Your QFX5120 is configured and ready to go. Here are some things you can do next.
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