Juniper QFX Series Switches

Refurbished Juniper QFX Series Switches
The Juniper QFX Series is Juniper’s flagship family of data center and cloud switches, designed for high-performance leaf–spine fabrics, EVPN-VXLAN deployments, and high-density 10/25/40/100G connectivity. BrightStar Systems specializes in used and refurbished Juniper QFX switches, from compact 1RU top-of-rack platforms to modular QFX10000 core and spine systems.

All QFX hardware we sell is independently stocked, fully tested, and backed by our 1-Year In-House Warranty. That combination of carrier-grade hardware, rigorous testing, and competitive pricing lets you build or expand modern Juniper data center fabrics without paying new-hardware premiums.

This page is your hub for the entire QFX family, including popular subseries such as the QFX3500, QFX5100, QFX5110, QFX5120, QFX5200, and QFX10000.

If you’re browsing broadly across Juniper platforms, you can also explore our Juniper routers & switches category or focus on campus and aggregation gear in the EX Series and edge routing in the MX Series.
Juniper QFX Series Overview
QFX switches provide a flexible switching platform for data center, cloud, and high-performance enterprise networks. Fixed 1RU models such as the QFX3500, QFX5100, QFX5110, QFX5120, and QFX5200 offer dense 10/25/40/100G ports for leaf and spine roles, while the modular QFX10000 family scales up to very large fabrics and core deployments.

Running Junos OS across QFX, EX, and MX gives you consistent CLI, automation hooks, and telemetry across the entire network. QFX platforms are commonly used as:

Leaf and spine nodes in EVPN-VXLAN fabrics
High-density top-of-rack (ToR) switches
Data center and campus distribution/core devices
Edge switches feeding into MX-based PE and BNG routers

Key Features & Capabilities of QFX Switches

High-density 10/25/40/100G Ethernet – Depending on the model, QFX switches provide a mix of SFP+, SFP28, QSFP+, and QSFP28 ports suitable for east–west traffic, server connectivity, and uplinks to spines.
EVPN-VXLAN fabric support – QFX platforms are a natural fit for EVPN-VXLAN-based leaf–spine topologies, often paired with MX Series routers as EVPN gateways at the WAN/Internet edge.
Low-latency L2/L3 switching – Many QFX switches are designed for low-latency environments such as trading, HPC, and latency-sensitive microservices.
Flexible deployment roles – Fixed QFX models work well at the leaf layer, spine layer, or even compact core roles, while QFX10000 scales to modular core/spine applications.
Operational consistency – Common Junos features and telemetry across QFX, EX, and MX simplify automation, monitoring, and troubleshooting.
Rich optics ecosystem – Broad support for 1G–100G optics and DAC/AOC cabling makes it easy to integrate with existing EX access switches, MX routers, and multi-vendor environments.

QFX Subseries Breakdown
QFX3500 – First-Generation 10G ToR & Converged Access
The QFX3500 family is an earlier-generation 10G top-of-rack platform. These switches provide dense 10GbE SFP+ access with QSFP uplinks and, in many cases, converged Ethernet capabilities that made them attractive for early data center consolidation projects. Today, they remain a cost-effective option for labs, smaller data centers, and environments standardizing on 10G access.
QFX5100 – Flexible 10/40G Data Center Workhorse
The QFX5100 line is widely deployed as a 10/40G leaf and spine platform. Common models such as the QFX5100-48S, QFX5100-48T, QFX5100-24Q, and QFX5100-96S provide a mix of 10G SFP+/10GBASE-T access with 40G uplinks, plus options for AC or DC power and AFO/AFI airflow. QFX5100 switches are often used as the access layer in EVPN fabrics or as compact spines in moderate-sized deployments.
QFX5110 – High-Performance 10/40/100G Leaf & Aggregation
The QFX5110 family builds on the QFX5100 with Broadcom Trident II+ ASICs, 10GbE server connectivity, and 40/100G uplinks. Models such as the QFX5110-48S and QFX5110-32Q deliver low-latency, feature-rich switching for EVPN-VXLAN fabrics, with options for SFP+ or 10GBASE-T access and 40/100G spine links. QFX5110 is a strong fit for leaf and aggregation roles where you want to extend the life of 10G server connectivity while introducing higher-speed uplinks.
QFX5120 – Modern 25/100G Leaf & EVPN Node
The QFX5120 family introduces dense 25G access with 100G uplinks in a fixed 1RU form factor. Models such as the QFX5120-48Y provide a strong platform for modern server refreshes where 25G access and 100G spine links are becoming standard.
QFX5200 – High-Density 25/100G for Spine & Leaf
The QFX5200 line includes 25G- and 100G-optimized switches like the QFX5200-32C, which offers high-density 100G QSFP28 ports in a compact chassis. QFX5200 is frequently used as a spine platform in EVPN fabrics, or as a leaf for server environments that are fully standardized on 25G and 100G.
QFX10000 – Modular Data Center & Core Switches
At the top end of the QFX family, the QFX10000 series provides modular chassis for large-scale data center and core networks. These switches can host high-density line cards for 40G/100G (and beyond), making them suitable for roles that blur the line between large-scale switching and routing, especially when deployed alongside MX Series edge routers.
Popular Juniper QFX Products We Stock
Inventory changes over time, but the following QFX SKUs are representative of the high-demand switches our customers frequently deploy. Each product page includes detailed specs, photos, and configuration options.

QFX3500-48S4Q-ACRB – 48x 10GbE SFP+ with 4x 40G QSFP uplinks
QFX5100-48TH-AFI – 48x 10GBASE-T with QSFP uplinks, AFI airflow
QFX5100-48S-AFO – 48x 10GbE SFP+ with AFO airflow
QFX5100-48S-DC-AFO – 48x 10GbE SFP+ with DC power and AFO airflow
QFX5100-48S-D-3AFI – 48x 10GbE SFP+ with enhanced features and AFI airflow
QFX5100-24Q-3AFO – 24x 40G QSFP fixed configuration with AFO airflow
QFX5100-96S-AFO – high-density 96x 10GbE SFP+ with AFO airflow
QFX5100-FAN-AFI – replacement fan module for QFX5100 with AFI airflow
QFX5110-48S-AFI – 48x 10GbE SFP+ with 40/100G uplinks, AFI airflow
QFX5110-48S-AFO – 48x 10GbE SFP+ with 40/100G uplinks, AFO airflow
QFX5110-32Q-AFO – 32x 40GbE QSFP+ aggregation or spine switch with AFO airflow
QFX5120-48Y-AFI2 – 48x 25GbE SFP28 with 100G uplinks, AFI airflow
QFX5200-32C-FANAFO – 32x 100GbE QSFP28 with modular fan tray
QFX10000-LC-BLNK – blank panel for QFX10000 line card slots

If you don’t see your exact QFX part number, our team can often source it or recommend an equivalent configuration that fits your design and optics strategy.
Typical QFX Use Cases & Deployment Scenarios

Leaf–spine EVPN fabrics – Use QFX5100/QFX5110/QFX5120 as leaf switches and QFX5200 or QFX10000 as spines, with MX Series routers acting as EVPN gateways and WAN edge.
Top-of-rack and end-of-row – Deploy QFX5100, QFX5110, or QFX5120 at the top of rack to provide 10G/25G server connectivity and 40G/100G uplinks into the fabric.
High-density aggregation – Use QFX5110, QFX5200, or QFX10000 where you need to aggregate many racks or pods at 40G/100G with room to scale.
Hybrid campus/data center cores – Combine QFX and EX Series switches to build cores that serve both data center and campus traffic, with QFX handling the higher-speed aggregation layer.
Multi-vendor environments – Integrate QFX fabrics with non-Juniper switches or with Arista platforms such as the 7050X, 7060X, 7160, 7280, or 7500 series where appropriate.

Compatibility: Optics, Uplinks, Airflow & Power Supplies
QFX switches support a broad range of transceivers and cables, but it’s important to validate optics and airflow/power combinations before you deploy at scale. BrightStar Systems can help you align QFX models with the right optics, fan trays, and PSUs for your environment.

We commonly assist customers with:

Optics mapping – Matching 1G/10G/25G/40G/100G transceivers and DAC/AOC cables to QFX access and uplink ports, and aligning them with Juniper EX or MX platforms.
Airflow direction – Choosing AFI (airflow-in) or AFO (airflow-out) QFX SKUs, fan trays, and PSUs that match your hot-aisle/cold-aisle design.
AC vs DC power – Selecting AC or DC power supplies based on your rack power strategy, including mixed deployments with AC-powered EX access and DC-powered QFX spines.
Spare strategy – Building spare pools of PSUs, fans, and key line-rate models (for example, a few extra QFX5100-48S, QFX5110-48S, and QFX5120-48Y units per data hall).

Lifecycle, EOL/EOS & Long-Term Support
Juniper QFX platforms have long lifecycles, especially in data center and campus environments where 10G and 25G remain dominant. Many QFX3500, QFX5100, and QFX5110 deployments continue to operate in production, while QFX5120, QFX5200, and QFX10000 cover newer deployments moving to 25G and 100G.

Buying refurbished QFX switches allows you to extend existing fabrics, spin up labs, or standardize a new site on proven hardware without committing to cutting-edge silicon across the entire footprint. BrightStar Systems can also help you plan transitions between QFX generations so that optics, power, and cabling investments carry forward as much as possible.
Testing, Refurbishment, Warranty & Buy-Back
Every QFX switch we sell goes through a structured testing and refurbishment process before it leaves our warehouse:

Visual inspection for physical damage, port condition, and connector integrity.
Power-on and burn-in testing with the correct AC or DC PSU configuration.
Port testing on key interfaces (10G/25G/40G/100G) and management ports.
Validation of fan and sensor behavior, including airflow direction and alarms.
Loading or wiping of Junos to align with your security and deployment policies.

All QFX hardware is backed by our 1-Year In-House Warranty for end users, with responsive support if anything does not perform as expected. We can also structure buy-back and trade-in programs for decommissioned QFX, EX, or non-Juniper switches, which can offset the cost of your refresh projects.

If you’re planning a new fabric, extending an existing QFX deployment, or consolidating mixed vendors into a Juniper-centric design, our team can help you select the right mix of QFX, EX, and MX platforms and build a practical, supportable bill of materials.
Juniper QFX Reference Guides & Comparisons
Juniper QFX vs EX Series Switches – Which Platform Fits Your Deployment?

Juniper QFX5100 vs QFX5110 vs QFX5200 – Detailed Data Center Comparison
Frequently Asked Questions About Juniper QFX Series Switches
What are the main differences between QFX5100, QFX5110, QFX5120, QFX5200, and QFX10000 switches?
QFX5100 is a flexible 10/40G platform commonly used for leaf or smaller spine roles. QFX5110 adds updated silicon, support for 40/100G uplinks, and richer EVPN-VXLAN features while still focusing on dense 10GbE access. QFX5120 brings dense 25G access with 100G uplinks for newer server generations. QFX5200 focuses on high-density 25G/100G and is frequently used as a spine switch. QFX10000 is a modular chassis family that scales to very large core and spine networks with high-density 40G/100G line cards.
Can I mix different QFX subseries within the same EVPN-VXLAN fabric?
Yes, it’s common to mix QFX5100, QFX5110, QFX5120, QFX5200, and QFX10000 in the same EVPN-VXLAN fabric as long as software versions and feature sets are aligned. Often, QFX5100, QFX5110, or QFX5120 switches are used at the leaf layer, while QFX5200 or QFX10000 systems serve as spines. We can help validate your exact topology and software matrix.
Do refurbished QFX switches support EVPN-VXLAN and other modern fabric features?
In most cases, yes. EVPN-VXLAN and advanced fabric features depend on platform generation and Junos OS, not whether the switch is new or refurbished. We regularly supply QFX5100, QFX5110, QFX5120, QFX5200, and QFX10000 hardware for EVPN fabrics and can recommend appropriate hardware and Junos versions for your design.
What optics and transceivers are compatible with Juniper QFX switches?
QFX switches support a wide range of 1G, 10G, 25G, 40G, and 100G optics, including SFP/SFP+, SFP28, QSFP+, QSFP28, and DAC/AOC cables. Compatibility depends on the specific QFX model and port type. We’ll help you map your port-speed requirements to supported transceiver SKUs and ensure they align with any EX or MX platforms in your design.
What airflow and power options are available on QFX platforms?
Many QFX switches are available in AFI (airflow-in) and AFO (airflow-out) variants, with matching fan trays and PSUs. You can also choose between AC and DC power options on several models. Selecting the right airflow and power options is important for aligning with your rack layout and power strategy, and we can help you build a standardized set of SKUs.
How does BrightStar Systems test and refurbish QFX hardware?
Our technicians inspect, power-test, and port-test each QFX switch under load, verify fan and sensor behavior, and confirm stable operation under Junos. Any failed components are replaced with known-good spares. Switches are then cleaned, professionally packaged, and shipped with our 1-Year In-House Warranty so they’re ready for immediate deployment.