Juniper QFX Series

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IT teams that need predictable east-west traffic and tighter control over shared infrastructure use Juniper QFX Series as the switching layer for growing data centre fabrics. It supports leaf, spine and DCI roles, so one platform can carry server access, aggregation and interconnect duties without fragmenting management as demand rises.

In compact rooms, larger pods and edge sites, it helps keep latency steady, reduce oversubscription and preserve rack-to-rack throughput. The range covers 25GbE leaf, 100GbE spine and 400GbE fabric roles, with options for dense EVPN-VXLAN designs and higher-radix switches where more headroom is needed.

Juniper QFX Series Quick Specs & Key Features

  • 100GbE Fabric Flexibility: Compact 1U data centre switching with EVPN-VXLAN support fits spine, leaf and DCI roles, giving enterprises a single fixed platform for high-speed rack interconnects and reducing fabric complexity.
  • Low-Latency Forwarding: Wire-speed L2/L3 forwarding keeps east-west traffic moving predictably between servers, storage and application tiers, supporting trading, analytics and shared media workflows with reduced latency.
  • Dense Port Radix: High-port 100GbE connectivity in a fixed footprint concentrates more fabric links per rack, helping teams scale leaf, spine or edge aggregation without increasing switch count.
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  • Scalable EVPN-VXLAN Overlay: EVPN-VXLAN fabric functions provide segmented Layer 2 and Layer 3 connectivity across distributed racks, simplifying multi-tenant and mixed-workload deployments while keeping operations consistent.
  • Flexible Uplink Architecture: Support for high-speed uplinks alongside server-facing fabric links lets operators balance oversubscription and backbone capacity, improving workload fit as rack designs change.
  • Compact Deployment Profile: A space-efficient fixed form factor suits dense data centre rows and edge sites, allowing high-capacity switching without the footprint of a modular platform.
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Find your ideal Juniper QFX Series

Full technical specifications are available on each product page.

Model Popularity Deployment Target Organisation Size Primary Use Case Access Ports Port Configuration Maximum Port Speed PoE Budget (W) Maximum Switching Capacity (Gbps) Stackable Operating System / Management Platform
Juniper QFX5120-32C 32-Port 100GbE Data Centre Switch Juniper QFX5120-32C 32-Port 100GbE Data Centre Switch ★ ★ ★ Data Centre Enterprise Leaf 32 32×QSFP28 100G — 6400 Supported Junos View
Juniper QFX5120-48Y 48-Port 25GbE Data Centre Switch Juniper QFX5120-48Y 48-Port 25GbE Data Centre Switch ★ ★ ★ Data Centre Enterprise Leaf 48 48×SFP28 + 8×QSFP28 100G — 4000 Supported Junos View
Juniper QFX5220-32CD 32-Port 400GbE AI Data Centre Switch Juniper QFX5220-32CD 32-Port 400GbE AI Data Centre Switch ★ ★ ★ Data Centre Service Provider Spine 32 32×QSFP-DD 400G — 25600 Supported Junos OS View
Juniper QFX5240-64OD 64-Port 800GbE AI Fabric Switch Juniper QFX5240-64OD 64-Port 800GbE AI Fabric Switch ★ ★ ★ Data Centre Service Provider Spine 64 64×OSFP 800G — 102400 Supported Junos OS View
Juniper QFX5130-32CD 32-Port 400GbE Data Centre Switch Juniper QFX5130-32CD 32-Port 400GbE Data Centre Switch ★ ★ ★ Data Centre Enterprise Leaf 32 32×QSFP-DD 400G — 25600 Supported Junos OS View
Juniper QFX5130-48C 48-Port 100GbE Data Centre Switch Juniper QFX5130-48C 48-Port 100GbE Data Centre Switch ★ ★ ★ Data Centre Enterprise Leaf 48 48×QSFP28 100G — 9600 Supported Junos OS View
Juniper QFX5210-64C 64-Port 100GbE Data Centre Spine Switch Juniper QFX5210-64C 64-Port 100GbE Data Centre Spine Switch ★ ★ ★ Data Centre Service Provider Spine 64 64×QSFP28 100G — 12800 Supported Junos View
Juniper QFX5241-64OD 64-Port 800GbE AI Data Centre Switch Juniper QFX5241-64OD 64-Port 800GbE AI Data Centre Switch — — — — — — — — — — — View

Juniper QFX Series Deployment Scenarios and Industries

Data Centres

Data centre teams need dense east-west capacity, predictable latency and clear leaf, spine and DCI scaling. Juniper QFX Series supports these fabrics with compact 100GbE, 400GbE and 800GbE switching options that help match port density to the role in the network.

Software Development

Platform, cloud and AI teams need fast movement between compute, storage and test clusters without creating bottlenecks in shared infrastructure. Juniper QFX Series provides fabric options for lab-to-production environments where EVPN-VXLAN connectivity and higher-speed links keep development environments moving.

Finance

Finance teams run trading, analytics and risk systems that depend on low latency and controlled oversubscription. Juniper QFX Series fits data centre fabrics for these workloads, giving them the switch capacity they need for stable movement between application, compute and storage racks.

Media & Entertainment

Studios and production teams handle large media files, render output and shared storage traffic that can quickly congest smaller links. Juniper QFX Series supports high-throughput fabric designs for moving content between storage, render nodes and production systems.

Telecoms

Telecoms operators and cloud providers need compact, high-capacity switching for NFV, peering and metro cloud fabrics. Juniper QFX Series gives these environments fixed-platform options for dense aggregation and higher-speed interconnects without moving to a chassis.

Juniper QFX Series Management and Licensing Options

Automate QFX Fabrics with Juniper Apstra

Juniper Apstra provides intent-based design, automation and assurance for QFX data centre fabrics. It helps teams build and operate EVPN-VXLAN environments consistently, validate configurations against the intended design and identify changes or conditions that could affect fabric performance.

Explore Juniper Apstra

Investigate QFX Network Issues with Juniper Marvis

Juniper Marvis uses AI-driven telemetry analysis and natural-language queries to help teams investigate issues across supported QFX switching environments. It highlights likely causes, affected services and recommended actions, helping engineers troubleshoot connectivity and performance problems more efficiently.

Explore Juniper Marvis

Design and Modernise Your QFX Data Centre Fabric

As a UK Juniper partner, Steel City Consulting assesses, designs, deploys and supports QFX switching environments. We help with platform selection, EVPN-VXLAN architecture, fabric migration, configuration, optimisation, maintenance and phased lifecycle planning around availability and future data centre growth.

Book a QFX Fabric Assessment

Designing & Supporting Juniper QFX Series Solutions

Backed by decades of expertise in the IT sector, our specialists support every stage of your deployment — from initial selection through to long-term lifecycle management.

  • Data Centre Assessment & QFX Platform Selection: We assess your applications, server connectivity, traffic patterns, port speeds, fabric capacity and growth plans before recommending Juniper QFX switching. Each platform is selected around its intended leaf, spine, aggregation or data centre role, avoiding unnecessary capacity and expenditure.
  • EVPN-VXLAN Fabric Design: We design scalable QFX fabrics using EVPN-VXLAN where appropriate, creating a consistent architecture for connecting servers, storage and data centre services. Resilience, routing, segmentation and available capacity are planned together to support predictable performance and future expansion.
  • Configuration, Deployment & Fabric Migration: Our engineers configure, stage and deploy QFX switches before migrating existing connections, VLANs, routing and network services. Dependencies, change windows and rollback options are carefully planned to minimise disruption to applications and production infrastructure.
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  • Fabric Automation & Assurance: We help teams use Juniper Apstra to define intended fabric behaviour, automate configuration and validate the operational state of QFX environments. Existing fabrics can also be assessed for configuration inconsistencies, capacity risks and opportunities to simplify ongoing administration.
  • Optimisation, J-Care & Lifecycle Planning: Steel City Consulting provides configuration support, firmware guidance, capacity reviews and phased refresh planning across QFX estates. We can also help arrange appropriate J-Care coverage, aligning Juniper support and replacement services with the availability requirements of your data centre.
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Juniper QFX Series FAQ

Need a different solution?

If these options aren’t the right fit for your environment, we provide a wide portfolio of product series and solutions that may better suit your infrastructure. Explore below, or speak to our team and we’ll help you find the right match.

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