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Installing an Expansion Module in a QFX5100 Device

Before you begin installing an expansion module in the switch, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

Ensure that you have the following parts and tools available:

  • ESD grounding strap. If a grounding strap is not available, follow the alternative grounding method described in Step 1 of the following procedure.

  • Phillips (+) screwdriver, number 2

The QFX5100-24Q device allows up to two expansion modules to be added to the port panel to increase port density. The QFX5100-24Q device holds two bays of expansion modules that can be mixed and matched as desired. The supported modules are:

  • QFX-EM-4Q–Each module adds four Quad Enhanced Small Form-Factor Pluggable (QSFP+) ports. See Figure 1.

    Figure 1: QFX-EM-4Q Expansion ModuleQFX-EM-4Q Expansion Module
  • EX4600-EM-8F–Each module adds eight 10 Gigabit SFP+ ports. See Figure 2.

    Figure 2: EX4600-EM-8F Expansion ModuleEX4600-EM-8F Expansion Module

The QFX5100-24Q device is configured for the QFX-EM-4Q by default, but any combination of the two modules is supported. Expansion modules can be hot-inserted or hot-removed. However, when an EX4600-EM-8F is inserted instead of the default QFX-EM-4Q, the new configuration causes the PFE to reboot and all of the interfaces to go down temporarily, causing a short disruption in traffic.

The QFX5100-24Q-AA switch supports the double-wide QFX-PFA-4Q expansion module, in addition to the QFX-EM-4Q (see Figure 1) and the EX4600-EM-8F (see Figure 2). The QFX-PFA-4Q module adds four 40-Gigabit Ethernet QSFP+ ports (see Figure 3).

Figure 3: QFX-PFA-4Q Expansion ModuleQFX-PFA-4Q Expansion Module

When an expansion module is installed in the switch or an existing expansion module is replaced with another expansion module, the switch detects the ports on the expansion module. The switch creates the required interfaces when transceivers are installed in these ports.

To install an expansion module in a QFX5100-24Q or a QFX5100-24Q-AA device (see Figure 4 and Figure 5):

  1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.

    If a grounding strap is not available, hold the expansion module in its antistatic bag in one hand and touch the exposed metallic part of the switch with the other hand to ground yourself and the component.

  2. If the module slot has a cover panel on it, remove the cover panel by using the screwdriver and save it for later use.
  3. Taking care not to touch module components, pins, leads, or solder connections, remove the expansion module from its bag.
  4. Loosen the captive screws on the front faceplate of the expansion module by using your fingers. If you are unable to loosen the captive screws by using your fingers, use the screwdriver.
  5. Using both hands, place the expansion module in the empty slot and slide it in gently until it is fully seated.

    After you have removed an expansion module, wait for at least 5 seconds before you install an expansion module. If you do not wait for at least 5 seconds, the interfaces on the expansion module might not come up.

  6. Raise the handle and tighten the captive screws by using your fingers or the screwdriver. For the QFX5100-24Q-AA, retract the ejector handles and tighten the captive screws by using your fingers or the screwdriver (see Figure 5). When the ST LED turns green, the expansion module is ready for use.

Figure 4 shows how to install a QSFP+ expansion module on the port panel of a QFX5100-24Q device.

Figure 4: Installing a QFX-EM-4Q Expansion Module in a QFX5100-24Q DeviceInstalling a QFX-EM-4Q Expansion Module in a QFX5100-24Q Device

Figure 5 shows how to install a QFX-PFA-4Q on the port panel of a QFX5100-24Q-AA switch.

Figure 5: Installing a QFX-PFA-4Q Expansion Module in a QFX5100-24Q-AA DeviceInstalling a QFX-PFA-4Q Expansion Module in a QFX5100-24Q-AA Device

When you install the QFX-PFA-4Q expansion module in a QFX5100-24Q-AA switch and reboot the switch, the two NIC ports in the NIC inside the QFX5100-24Q-AA switch are enabled automatically. When you install other expansion modules (QFX-EM-4Q or EX4600-EM-8F), the NIC ports are enabled only when an EX4600-EM-8F is installed in slot 2 (QIC1), that is, the expansion module slot located on your right as you face the QFX5100-24Q-AA. To verify that the NIC ports are enabled, run the show interfaces terse command. For a QFX-PFA-4Q, the NIC interface names are displayed in the command output as, xe-0/0/40 and xe-0/0/41. For an EX4600-EM-8F installed in slot 2 (QIC1), the NIC interfaces are displayed as xe-0/0/24 and xe-0/0/25.


If you have a Juniper Care service contract, register any addition, change, or upgrade of hardware components at . Failure to do so can result in significant delays if you need replacement parts. This note applies if you change the type of power supply or add a new type of expansion module. It does not apply if you replace these components with the same type of component.