QFX5240 System Overview

The Juniper Networks® QFX5240 Switches are high-density devices that you can use as end-of-row, leaf or spine devices in an IP fabric architecture. These 2-U fixed-configuration switches offer up to 64 800-Gigabit Ethernet (GbE) ports through two models—the QFX5240-64OD and the QFX5240-64QD.

The QFX5240-64OD offers 64 800-Gbps octal small form factor pluggable (OSFP) ports and 2 10-Gbps SFP+ ports. The QFX5240-64QD switch has 64 800-Gbps quad small form-factor pluggable - double density (QSFP-DD) ports and 2 10-Gbps SFP+ ports. With a bandwidth of 51.2 terabits per second (Tbps), the QFX5240 is an optimal choice for shallow buffer platforms for the spine role in the data center fabric. The QFX5240 switches use the high-radix class TH5 - BCM78900 chip, which is a dedicated ASIC for high-bandwidth network switching devices.

An Intel 4-core 2.2-GHz Ice Lake processor drives the QFX5240 control plane, which runs the Junos OS Evolved software. The Junos OS Evolved software image is stored on two internal 480-GB Non-Volatile Memory Express (NVMe) solid-state drives (SSDs).

Figure 1: Front View of the QFX5240-64OD Switch

Figure 2: Rear View of the QFX5240-64OD Switch

Figure 3: Front View of the QFX5240-64QD Switch

Figure 4: Rear View of the QFX5240-64QD Switch

The QFX5240 has two models: QFX5240-64OD-AO and QFX5240-64QD-AO. Table 1 provides an overview of the QFX5240 hardware models.

The QFX5240 runs the Junos OS Evolved operating system. Junos OS Evolved provides several capabilities that include Layer 2 and Layer 3 switching, routing, and security services. The Junos OS Evolved software is installed on the solid-state drives (SSD) in the switch.

You can manage the switch using the Junos OS Evolved CLI, accessible through the console and out-of-band management ports on the device.

The following hardware components provide redundancy on QFX5240 switches:

• QFX5240 power supply units (PSUs)—The QFX5240 PSUs are hot-removable and hot-insertable field-replaceable units (FRUs). The PSUs provide 1+1 redundancy. When installing or replacing the PSUs, you don't need to shut down the device or interfere with the switching process. See Table 2.

  Table 2: QFX5240 Power Supply Specifications

  PSU	Item	Specification
  QFX5240-PWR-AC-AO, 3000 W	Maximum output power	3000 W
  	AC input current rating	16 A maximum
  	AC input voltage	200 V–240 V AC
  	AC input line frequency	50/60 Hz

• QFX5240 cooling system—The cooling system consists of four front-to-back (airflow out or AFO) fan modules with each fan module containing 2 rotors. The cooling system offers N+1 redundancy at rotor level. The fan modules are hot-insertable and hot-removable FRUs.

  Table 3: Cooling System Specifications

  Fan Module	Description	Airflow
  QFX5240-2U-FANAO	AIR OUT, port-to-FRU airflow	Front-to-back

Field-replaceable units (FRUs) are switch components that you can replace at your site. The QFX5240 switches uses these types of FRUs:

• Hot-insertable and hot-removable—You can remove and replace these components without powering off the switch or disrupting the switching function.

• Hot-pluggable—You can remove and replace these components without powering off the switch, but the switching function is interrupted until you replace the component.

The power supplies and fan modules in the QFX5240 are hot-insertable and hot-removable FRUs, which means you can replace them out without turning the switch off or interfering with its functionality. See Table 4.

The QFX5240 chassis is a rigid sheet-metal structure that houses the hardware components (see QFX5240 Chassis Physical Specifications).