Step 1: Begin
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.
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:
Install the QFX5120
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
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.
- Review the General Safety Guidelines and Warnings.
- Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end to a site ESD point.
- Position the switch so that the
AIR INlabels on the fan modules are facing the cold aisle, or the
AIR OUTlabels on the fan modules are facing the hot aisle.
- Attach the front mounting brackets to the switch.
- 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.
- 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.
- Continue holding the switch in place, and have the second person slide the rear mounting brackets into the side mounting rails.
- Secure the rear mounting brackets to the rack posts using the rack mount screws.
- Verify that the mounting brackets on each side of the rack are level.
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.
- 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.
- Connect one end of the grounding cable to a proper earth ground, such as the rack.
- Place the grounding lug attached to the grounding cable over the protective earthing terminal on the left panel.
- Secure the grounding lug to the protective earthing terminal using the 10-32 x .25-in. screws with #10 split-lock washers.
- 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.
- Ensure that the power supplies are fully inserted in the switch.
- 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.
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.
- If the AC power source outlet has a power switch, turn it off.
- 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.
- If the AC power source outlet has a power switch, turn it on.
- Verify that the
DCLEDs 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).
- Repeat steps 7-11 to power on the second power supply.