Juniper QFX vs EX Series Switches
All Juniper switches fall within one of two series: the Juniper QFX Series switches and the Juniper EX Series switches. Both series include multiple models with different port configurations, performance tiers, and Ethernet speed support. While they share many design principles, they serve different architectural roles and deployment scenarios.
To help you determine whether you should buy Juniper EX or QFX Series switches, we’ve created a detailed comparison outlining all major specifications and deployment considerations. Below, you’ll learn how these two product families overlap — and where they differ significantly.
Since this guide was originally written, network infrastructure has evolved rapidly. Organizations have increasingly adopted EVPN-VXLAN fabrics, automation platforms such as Ansible and Juniper Apstra, and higher-density 25G/100G infrastructure. As a result, many environments now combine EX and QFX platforms within the same network — using EX switches for campus, branch, and access roles, while QFX switches power high-performance data center fabrics and routing workloads. Choosing the correct platform ensures long-term scalability and cost efficiency.
Juniper QFX Series Switches and Specifications
The Juniper QFX Series spans multiple models ranging from compact 1RU switches to large modular systems supporting high-scale spine and core deployments. QFX switches support a variety of Ethernet speeds, including 1G, 10G, 25G, 40G, 100G, and 400G, depending on the platform.
The primary Juniper QFX switches are:
Except for the entry-level QFX5100, nearly all QFX Series switches support high-speed 100G interfaces, and newer platforms like the QFX5130 Series extend this to 400G. These platforms are typically fixed-configuration, except the QFX10000 Series, which uses modular chassis for massive scalability.
We also carry end-of-life options such as the QFX3500.
The introduction of the QFX5120 and QFX5130 significantly strengthened Juniper’s position in cloud and hyperscale environments. These models include advanced EVPN-VXLAN support, automation capabilities, and flexible 25G/100G/400G port options, making them ideal for modern data center leaf-and-spine architectures, AI/ML compute fabrics, and HPC clusters.
Juniper EX Series Switches and Specifications
The Juniper EX Series covers a wide spectrum of access, aggregation, and campus-core switches. These platforms range from compact 1RU access devices — such as the EX4300 Series campus switches — to large modular options like the EX9250. EX switches support speeds from 1G to 100G depending on the model.
- EX2200
- EX2200-C
- EX2300 & EX2300 Multigigabit
- EX2300-C
- EX3200 (end-of-life)
- EX3300
- EX3400
- EX4200
- EX4300 access switch
- EX4300 Multigigabit
- EX4400 Series campus switches
- EX4500 (end-of-life)
- EX4550
- EX4600 40G/100G aggregation switch
- EX4650
- EX6200 (end-of-life)
- EX8200 (end-of-life)
- EX9200
- EX9250 family
At the access and branch layers, the EX2200, EX3400, and EX4300 Series switches remain extremely popular due to their reliability and flexible Virtual Chassis support. Higher-performance aggregation platforms — such as the EX4600 high-performance aggregation switch — introduce 40G/100G uplinks and EVPN-VXLAN features suitable for modern fabric-based campus designs.
Top-tier core switches like the EX9200 and EX9250 support dense 100G Ethernet and modular line-card expansion for large enterprise deployments.
Key Similarities and Differences Between Juniper EX and QFX Series Switches
Both EX and QFX switches offer Junos consistency, Virtual Chassis/VCF support (model-dependent), modular options, and rich automation capabilities. However, their intended roles differ substantially.
QFX switches are designed for spine-and-leaf data center architectures, offering deep buffers, advanced routing scale, high telemetry throughput, and high-speed uplinks (25G/100G/400G).
EX switches are designed for campus access, branch, enterprise aggregation, and EVPN-enabled fabric-based campus networks.
Today, many environments combine both families, for example:
- EX4300 campus access switch → EX4650 aggregation → QFX5120 25G/100G leaf switch → QFX5130 100G/400G spine switch
- EX4600 aggregation switch → QFX5200 or QFX10002 for routed EVPN backbones
EX vs QFX Series Comparison Table (2025 Overview)
| Feature | Juniper EX Series | Juniper QFX Series |
|---|---|---|
| Primary Role | Campus access, branch, aggregation, EVPN-enabled campus fabrics | Data center leaf/spine, routing, high-performance fabrics |
| Typical Speeds | 1G, 10G, 25G, 40G, 100G (EX4400, EX4600, EX4650) | 10G, 25G, 40G, 100G, 400G (QFX5120, QFX5130) |
| Ideal Platforms |
EX4400 campus switch, EX4300 access switch, EX4600 aggregation switch |
QFX5120-48Y, QFX5110-48S, QFX5130 Series |
| Best For | Campus access, PoE/PoE+, Wi-Fi aggregation, EVPN campus fabrics, Mist-managed networks | Leaf/spine fabrics, routing, large EVPN deployments, storage networks, virtualization clusters |
| Automation | Mist, ZTP, basic Junos automation | Advanced telemetry, OpenConfig, gNMI, automation for large-scale DC operations |
Modern Deployment Guidance
Choose EX switches for campus or access roles where PoE, Wi-Fi backhaul, and cost-effective distribution are priorities. Platforms such as the EX4300 Series, EX4400 Series, and EX4600 aggregation switch provide the necessary 10G/25G uplinks and campus fabric capabilities.
Choose QFX switches for data center fabrics, leaf/spine topologies, large EVPN deployments, or high-performance workloads requiring deep buffers and large routing tables. Popular platforms include the QFX5120 25G/100G leaf switch, QFX5110 10G/100G leaf, and QFX5130 Series.
FAQs: Choosing Between Juniper EX and QFX Switches
Can EX and QFX switches be used in the same EVPN fabric?
Yes. Modern platforms like the EX4400 campus switch, EX4600 aggregation switch, and QFX leaf switches support EVPN-VXLAN, enabling unified segmentation from campus to core.
Which EX switch is best for modern campus designs?
The EX4400 Series is the current flagship, but the EX4600 40G/100G aggregation switch is ideal for EVPN campus cores.
Which QFX switches are most commonly deployed today?
The QFX5120, QFX5110, and QFX5130 Series remain the most popular choices for 25G/100G or 100G/400G fabrics.
Our Rigorous Testing Process and Warranty
At BrightStar Systems, we supply thoroughly tested, fully validated pre-owned Juniper EX and QFX switches — including campus workhorses like the EX4300 and EX4600, as well as high-performance data center platforms such as the QFX5120 and QFX5130.
All equipment is covered by our BrightStar Systems 1-Year, In-House Warranty, and we offer both buyback and trade-in options for organizations modernizing their networks.
Contact us to compare models, verify compatibility, or request a quote for EX or QFX hardware.