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QFX10008 System Overview


QFX10008 Hardware Overview

The Juniper Networks® QFX10008 modular data center spine and core Ethernet switch provides cloud and data center operators with a smooth transition from 10-Gigabit Ethernet and 40-Gigabit networks to 100-Gigabit Ethernet high-performance networks. This high-performance, 13 rack unit (13 U) modular chassis can provide 48 Tbps of throughput and 16 Bpps of forwarding capacity. The QFX10008 has eight slots for line cards that can support a maximum of one-thousand, one-hundred fifty-two 10-Gigabit Ethernet ports, two-hundred eight-eight 40-Gigabit Ethernet ports, or two-hundred forty 100-Gigabit Ethernet ports.

The QFX10008 can be deployed in various network designs and fabrics including:

  • Layer 3 fabrics

  • Junos Fusion

  • Juniper Networks MC-LAG for Layer 2 and 3 networks

The QFX10008 is available in both base and redundant configurations for both AC and DC operation. All systems feature front to back airflow. This airflow is also know as airflow out (AFO).

This topic covers:

Benefits of QFX10000 Modular Chassis Switches

System throughputThe Juniper Networks® QFX10000 line of modular Ethernet switches delivers up to 96 Tbps of system throughput to meet the rapid and ongoing traffic growth in the data center. Industry-leading scale and density on the QFX10000 modular switches redefine per-slot economics, enabling you to do more with less while simplifying network design and reducing operating expenditures.
Logical scaleThe QFX10000 modular switches deliver the highest Layer 2 / Layer 3 scale with up to 1 million MAC addresses, 2 million host routes, and 2 million FIB. The system also supports deep buffers with up to 100ms packet buffering per port. Virtual output Queue (VoQ) based architecture prevents head-of-line blocking.
Network architecturesThe QFX10000 line can be deployed in a number of different network designs and fabrics, including Layer 3 fabric and Juniper MC-LAG for Layer 2 and Layer 3 networks, giving customers complete architectural flexibility. Additionally, the open architecture ensures that customers can innovate on top of Juniper Networks Junos® operating system to accelerate the pace of innovation.

Chassis Description

The QFX10008 is 13 U tall. Up to 3 QFX10008 chassis can fit in a standard 42 U rack with adequate cooling and power. All key QFX10008 components are field-replaceable units (FRUs). Figure 1 illustrates the key components visible from the front of the chassis, Figure 2 illustrates the components that are visible from the rear of the chassis, and Figure 3 illustrates the components that are internal to the chassis.

Figure 1: QFX10008 Chassis Front
QFX10008 Chassis Front
Control boards
Installation holes for the front panel
Status LED panel
Line card slots 0-7 (numbered top to bottom)

Starting in May 2019, new chassis ship with an enhanced power bus to support the power needs of higher wattage line cards. Chassis with the enhanced power bus have a modified Status Panel (see QFX10000 Status Panel LEDs).

Figure 2: QFX10008 Chassis Rear
QFX10008 Chassis Rear
AC or DC power supplies slots 0-7 (numbered top to bottom)
Fan trays with redundant fans

Figure 3: QFX10008 Chassis Internal Components
QFX10008 Chassis
Internal Components
Fan tray controllers
Switch interface boards (SIBs) slots 0-5 (numbered left to right)

See QFX10008 Chassis Physical Specifications and QFX10000 Field-Replaceable Units.

Routing and Control Board

The Routing and Control Board (RCB) contains a routing engine and is responsible for the system management and system control in QFX10008. See Figure 4. RCBs are FRUs that are installed in the front of the chassis in the slots labeled CB0and CB1. The base configuration has a single RCB; the fully-redundant configuration has two RCBs. The RCB also contains Precision Time Protocol ports and four MAC-SEC capable ports. See QFX10000 Routing and Control Board Description.

Figure 4: QFX10000 RCB
QFX10000 RCB

Line Cards

The QFX10008 features eight horizontal line card slots and supports line rate for each line card. The line cards combine a Packet Forwarding Engine (PFE) and Ethernet interfaces enclosed in a single assembly. The QFX10008 line card architecture is based on number of identical, independent PFE slices each with 500 Gbps full-duplex throughput. Line cards are FRUs that can be installed in the line card slots labeled 0 through 7 (top to bottom) on the front of the switch chassis. All line cards are hot-removable and hot-insertable.

Five line cards are available for the QFX10008:

  • QFX10000-36Q–provides 36 ports of 40-gigabit QSFP+. Twelve ports are designed to be 100-Gigabit capable using QSFP28. Each of the 40-Gigabit QSFP+ can be configured as either a native 40-Gigabit port or four 10-Gigabit ports using a breakout cable. With breakout cables, the line card supports a maximum of 144 logical 10-Gigabit Ethernet ports.

  • QFX10000-30C–provides 30 ports of either 100-gigabit or 40-gigabit QSFP28. The ports autodetect the type of transceiver installed and set the configuration to the appropriate speed. Each of the 40-gigabit ports can be configured as either a native 40-gigabit port or four 10-gigabit ports using a breakout cable. With breakout cables, the line card supports a maximum of 96 logical 10-Gigabit Ethernet ports.

  • QFX10000-30C-M–provides 30 ports of either 100-gigabit or 40-gigabit QSFP28 that support MACsec security features.

  • QFX10000-60S-6Q–provides 60 SFP+ ports that can be configured for either 1-gigabit or 10-gigabit speeds. The card also provides six flexible configuration ports for 100-gigabit and 40-gigabit speeds. Of the six flexible configuration ports, two ports have QSFP28 sockets that support either 100-gigabit or 40-gigabit speeds. The remaining four ports have QSFP+ sockets that can be configured as either a native 40-gigabit port or four 10-gigabit ports using a breakout cable. With breakout cables, the line card supports a maximum of 84 logical 10-Gigabit Ethernet ports.

  • QFX10K-12C-DWDM-provides 6 coherent dense wavelength-division multiplexing (DWDM) ports with built-in optics. The card supports MACsec security features and provides a flexible rate modulation at 100 Gbps, 150 Gbps, and 200 Gbps speeds.

See Figure 5 for an example of a QFX10000 line card.

Figure 5: QFX10000-36Q Line Card
QFX10000-36Q Line Card


Five SIBs provide the necessary switching functionality to a base configuration QFX10008. A sixth SIB is available in the redundant configuration to provide N+1 redundancy. SIBs are installed between the line cards and the fan trays inside of the chassis (see Figure 6). Each QFX10008 SIB has eight connectors that match to a line card slot eliminating the need for a backplane. When all six SIBs are installed, the QFX10008 has a net switching capacity of 42 Terabytes. See QFX10008 Switch Interface Board.

Figure 6: QFX10008 SIB
QFX10008 SIB

Cooling System

The cooling system in a QFX10008 consists of two hot-removable and hot-insertable FRU fan trays (see Figure 7) and two fan tray controllers (see Figure 8). Each fan tray contains 11 fans. The fan trays install vertically on the rear of the chassis and provides front to back chassis cooling. See QFX10008 Cooling System.

Figure 7: QFX10008 Fan Tray
QFX10008 Fan Tray
Figure 8: QFX10000 Fan Tray Controller
QFX10000 Fan
Tray Controller

Power Supplies

Power supplies for the QFX10008 are fully redundant, load-sharing, and hot-removable and hot-insertable (FRUs. Each QFX10008 base configuration has three power supplies; redundant configurations hold the maximum of six AC or DC power supplies. Each power supply has an internal fan for cooling. See Figure 9 and Figure 10.


Mixing different types of power supplies (AC and DC) in the same chassis is not supported.

Figure 9: QFX10000 AC Power Supply
QFX10000 AC Power Supply
Figure 10: QFX10000 DC Power Supply
QFX10000 DC Power Supply


The Juniper Networks QFX Series Ethernet Switches run Junos OS, which provides Layer 2 and Layer 3 switching, routing, and security services. The same Junos OS code base that runs on QFX Series switches also runs on all Juniper Networks EX Series, M Series, MX Series, and T Series routers and SRX Series Services Gateways.

QFX10008 Configurations

Table 1 lists the four hardware configurations for a QFX10008 modular chassis—base (AC version), and redundant (AC and DC versions)—and the components included in each configuration.

Table 1: QFX10008 Hardware Configurations

Switch Configuration

Configuration Components

Base AC configuration


  • Chassis, including power bus

  • One Control Board

  • One Control Board cover panel

  • Two fan tray controllers

  • Two fan trays

  • Three 2700 W AC power supplies

  • Three power supply cover panels

  • Six power cords

  • Five Switch Interface Boards (SIBs)

  • One SIB cover panel

  • Eight line card cover panels

Redundant AC configuration


  • Chassis, including power bus

  • Two Control Boards

  • Two fan tray controllers

  • Two fan trays

  • Six 2700 W AC power supplies

  • Twelve power cords

  • Six SIBs

  • Eight line card cover panels

Redundant DC configuration


  • Chassis, including power bus

  • Two Control Boards

  • Two fan tray controllers

  • Two fan trays

  • Six 2500 W DC power supplies

  • Six SIBs

  • Eight line card cover panels


You can install up to eight line cards (any combination of line cards) in the switch.


Line cards, the cable management system, and the SATA solid state drive are not part of the base or redundant configurations. You must order them separately.


If you want to purchase additional power supplies (AC or DC), SIBs, or Control Boards for your switch configuration, you must order them separately.

QFX10000 Hardware and CLI Terminology Mapping

This topic describes the hardware terms used in QFX10000 documentation and the corresponding terms used in the Junos OS command-line interface (CLI). See Table 2.

Table 2: CLI Equivalents of Terms Used in Documentation for QFX10000 Switches

Hardware Item (CLI)

Description (CLI)

Value (CLI)

Item In Documentation

Additional Information




Switch chassis

QFX10008 Physical Specifications and QFX10016 Chassis Physical Specifications


CB (n)

n is a value in the range of 0–1.

Multiple line items appear in the CLI if more than one RCB (CB) is installed in the chassis.


QFX10000 Routing and Control Board

FPC (n)

Abbreviated name of the Flexible PIC Concentrator (FPC)

On QFX10008 and QFX10016, an FPC equates to a line card.

n is a value in the range of 0–7 for the QFX10008 and 0–15 for the QFX10016. The value corresponds to the line card slot number in which the line card is installed.

Line card (The switch does not have actual FPCs–the line cards are the FPC equivalents on the switch.)

Understanding Interface Naming Conventions

Xcvr (n)

Abbreviated name of the transceiver

n is a value equivalent to the number of the port in which the transceiver is installed.

Optical transceivers

QFX10000 Optical Transceiver and Cable Support

PSU (n)

One of the following:

  • QFX10000-PWR-AC

  • QFX10000-PWR-DC

n is a value in the range of 0–5. The value corresponds to the power supply slot number.

AC or DC power supply

Fan tray



Fan tray

QFX10008 Cooling System and Airflow

QFX10016 Cooling System and Airflow

SIB (n)

This field indicates:

  • State of the fabric plane:

    • Active

    • Spare

    • Check State

  • Status of the Packet Forwarding Engine in each fabric plane:

    • Links OK

    • Error

n is a value in the range of 0–5.

Fabric plane

show chassis fabric sibs

PIC (n)

Value of n is always 0.

Understanding Interface Naming Conventions

QFX10000 Component Redundancy

The QFX10000 is designed so that no single point of failure can cause the entire system to fail. The following major hardware components in the redundant configuration provide redundancy:

  • Routing and Control Board (RCB)—The RCB consolidates the Routing Engine function with control plane function in a single unit. The QFX10000 can have one or two RCBs. When two RCBs are installed, one functions as the master and the other functions as the backup. If the master RCB (or either of its components) fails, the backup can take over as the master. See QFX10000 Routing and Control Board Description.

  • Switch Interface Boards (SIBs)—The QFX10000 has six SIB slots. Five SIBs are required for base operation and the sixth SIB provides N+1 redundancy. All six SIBs are active and can sustain full throughput rate. The fabric plane can tolerate one SIB failure without any loss of performance. See the QFX10008 Switch Interface Board Description and QFX10016 Switch Interface Board Description.

  • Power supplies—The QFX10000 requires three power supplies for minimum operation (two RCBs, two fan trays, six SIBs and no line cards). With additional power supplies, it provides N+1 redundancy for the system. Both AC and DC systems tolerate a single power supply to fail without system interruption. If one power supply fails in a fully redundant system, the other power supply can provide full power to the QFX10000 indefinitely.

    The QFX10000 also supports source redundancy. Two sets of grounding lugs are provided for the DC power cables, and two AC power cords are provided for each AC power supply.

  • Cooling system—The fan trays have redundant fans, which are controlled by the fan tray controller. If one of the fans fails, the host subsystem increases the speed of the remaining fans to provide sufficient cooling for the switch indefinitely. See QFX10008 Cooling System and Airflow and QFX10016 Cooling System and Airflow .