Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Unpack and Mount the QFX5100 Switch

Unpack a QFX5100 Device

The QFX5100 switch chassis is a rigid sheet-metal structure that houses the hardware components. A QFX5100 device is shipped in a cardboard carton, secured with foam packing material. The carton also contains an accessory box and quick start instructions.


QFX5100 devices are maximally protected inside the shipping carton. Do not unpack the switch until you are ready to begin installation.

To unpack a QFX5100 device:

  1. Move the shipping carton to a staging area as close to the installation site as possible, but where you have enough room to remove the system components.
  2. Position the carton so that the arrows are pointing up.
  3. Open the top flaps on the shipping carton.
  4. Remove the accessory box and verify the contents against the inventory included in the box. Table 1 lists the inventory of components supplied with a QFX5100 device.
  5. Pull out the packing material holding the switch in place.
  6. Verify the chassis components received:
    • Two power supplies

    • Fan modules

      • Five fan modules for 1 U devices

      • Three fan modules for 2 U devices


    Product SKU QFX5100-24Q: If you ordered the optional high-speed uplink modules, they are packaged as components and must be installed in the switch

  7. Save the shipping carton and packing materials in case you need to move or ship the switch later.
Table 1: Inventory of Components Supplied with a QFX5100 Device



Chassis with five fan modules and two power supplies. The QFX5100-96S has three fan modules.


Rear mounting blades


Front mounting brackets


Extension brackets


RJ-45 cable and RJ-45 to DB-9 adapter


Power cords (AC systems only)


Register Products—Mandatory to Validate SLAs

Register all new Juniper Networks hardware products and changes to an existing installed product using the Juniper Networks website to activate your hardware replacement service-level agreements (SLAs).


Register product serial numbers on the Juniper Networks website. Update the installation base data if any addition or change to the installation base occurs or if the installation base is moved. Juniper Networks is not responsible for not meeting the hardware replacement service-level agreement for products that do not have registered serial numbers or accurate installation base data.

Register your product(s) at your installation base at

Mount a QFX5100 Device in a Rack or Cabinet

You can mount all QFX5100 switches on a four post 19-in. rack or cabinet using the mounting kit provided with the device.

For four post rack or cabinet installations, the mounting kit contains two front mounting rails with two matching rear mounting blades. This configuration allows either end of the switch to be mounted flush with the rack and still be adjustable for racks with different depths.

(The remainder of this topic uses “rack” to mean “rack or cabinet.”) The front and rear rack rails must be spaced between 28.5 in. (72.4 cm) to 31.5 in. (80 cm) front to back.

Before You Begin Rack Installation

Before you begin mounting a QFX5100 switch in the rack or cabinet:

  1. Ensure that you understand how to prevent electrostatic discharge (ESD) damage. See Prevention of Electrostatic Discharge Damage.
  2. Verify that the site meets the requirements described in Site Preparation Checklist for a QFX5100 Device.
  3. Place the rack in its permanent location, allowing adequate clearance for airflow and maintenance, and secure it to the building structure.
  4. Read General Site Guidelines, with particular attention to QFX5100 Installation Safety Guidelines.
  5. Remove the switch from the shipping carton (see Unpack a QFX5100 Device).
  6. Ensure that you have the following parts and tools available to mount the switch in a rack:
    • ESD grounding strap (not provided).

    • Blades, rails, or brackets (provided).

      • For four-post installations:

        • One pair of rear mounting blades. These mounting blades support the rear of the chassis and must be installed (provided).

        • One pair of front mounting rails. The mounting blades slide into the mounting rails to support the switch (provided).

        • Screws to secure the mounting rails to the chassis (provided).

          • Twelve screws for 1 U chassis

          • Twenty-four screws for QFX5100-96S

        • Eight screws to secure the chassis and rear installation blades to the rack (not provided).

    • Appropriate screwdriver for the mounting screws (not provided).

    • Two power cords with plugs appropriate to your geographical location (provided).

    • RJ-45 cable and RJ-45 to DB-9 serial port adapter (provided).

    • Management host, such as a PC laptop, with a serial port (not provided).

Optional equipment: Grounding cable kit with bracket, lug, and three nuts with integrated washers.


The 1 U versions of QFX5100 switches must be supported at all four corners. Mounting the chassis using only the front brackets will damage the chassis and can result in serious bodily injury.


All QFX5100 switches require two people for installation, one person to lift the switch into place and another person to attach the switch to the rack. If you are installing the QFX5100 switch above 60 in. (152.4 cm) from the floor, you can remove the power supplies and fan modules to minimize the weight before attempting to install the switch.


If you are mounting multiple switches on a rack, mount the switch in the lowest position of the rack first. Proceed to mount the rest of the switches from the bottom to the top of the rack to minimize the risk of the rack toppling.

Four-Post Procedure

To mount the switch on four posts in a rack using the provided mounting kit:

  1. Attach the ESD grounding strap to your bare wrist and to a site ESD point.
  2. Decide whether the Field Replaceable Unit (FRU) end of the switch or the port end is to be placed at the front of the rack. Position the switch in such a manner that the AIR IN labels on components are next to the cold aisle and AIR OUT labels on components are next to the hot aisle.
  3. Align the holes in the mounting rail with the holes on the side of the chassis. See Figure 1 through Figure 3 for examples the proper alignment of 1 U and 2 U chassis systems.
    Figure 1: Attaching Mounting Rails to the QFX5100-24QAttaching Mounting Rails to the QFX5100-24Q
    Figure 2: Attaching Mounting Rails to the QFX5100-48SAttaching Mounting Rails to the QFX5100-48S
    Figure 3: Attaching Mounting Rails to the QFX5100-96SAttaching Mounting Rails to the QFX5100-96S
  4. Attach the mounting rail to the switch using the mounting screws (and cage nuts and washers if your rack requires them). Tighten the screws.
  5. Repeats steps 4 and 5 on the opposite side of the switch.
  6. Have one person grasp both sides of the switch, lift it, and position it in the rack so that the front bracket is aligned with the rack holes.
  7. Have a second person secure the front of the switch to the rack using four mounting screws (and cage nuts and washers if your rack requires them.) Tighten the screws. See Figure 4 and Figure 5 for examples of connecting the mounting rails and blades.
    Figure 4: Attach 1 U Switch to RackAttach 1 U Switch to Rack
    Figure 5: Slide Mounting Rail onto the QFX5100-96S Rear Mounting BladeSlide Mounting Rail onto the QFX5100-96S Rear Mounting Blade
  8. Continue to support the switch while sliding the rear mounting-blades into the channel of the side mounting-rails and securing the blades to the rack. Use the four mounting screws (and cage nuts and washers if your rack requires them) to attach each blade to the rack. (Use eight front-mounting screws for the QFX5100-96S.) Tighten the screws. See Figure 6.
    Figure 6: Slide Mounting Blade into 1 U Mounting RailSlide Mounting Blade into 1 U Mounting Rail
  9. Ensure that the switch chassis is level by verifying that all the screws on the front of the rack are aligned with the screws at the back of the rack.