Juniper QFX3500 Series Switches

Juniper QFX3500 Series Switches (Used & Refurbished)
The Juniper QFX3500 Series is a flexible, high-performance data center switch designed for 10GbE access, high-density top-of-rack deployments, and converged server environments. Offering low-latency performance, 1/10GbE connectivity, and a proven Junos OS feature set, the QFX3500 provides a reliable and cost-effective option for modernizing data center networks. BrightStar Systems supplies fully tested used and refurbished QFX3500 switches backed by our 1-Year In-House Warranty, helping you deploy or expand high-performance rack-level switching at a fraction of new hardware cost.

The QFX3500 is widely deployed in traditional three-tier data centers, enterprise server racks, HPC clusters, and environments transitioning from legacy 1GbE to 10GbE architectures.
Juniper QFX3500 Series Overview
The QFX3500 Series was designed as a 10GbE top-of-rack switch offering high port density, low latency, and flexible device personality modes. The platform supports 10GbE SFP+ access ports, 40GbE uplinks, and a unified Junos OS experience across Juniper’s data center portfolio.

Key features of the QFX3500 Series include:

High-density 10GbE (SFP+) switching for rack-level server aggregation.
40GbE QSFP+ uplinks for spine or aggregation connectivity.
Low-latency architecture suitable for HPC and clustered compute environments.
Advanced L2/L3 features including VLANs, QinQ, OSPF, BGP, and VRRP.
Flexible deployment modes for converged and traditional Ethernet designs.
Junos OS consistency for automation, operational reliability, and standardized workflows.

The QFX3500 serves as a strong transitional platform for organizations moving from 1GbE top-of-rack designs to scalable 10GbE architectures with 40GbE uplinks for aggregation and spine roles.
Explore More Juniper Data Center Platforms
QFX3500 switches are part of Juniper’s broader data center portfolio. BrightStar Systems can help you mix QFX platforms based on performance, density, and long-term growth requirements.

All Juniper QFX Series Switches
Juniper QFX5100 Series – Successor platform offering flexible 10/40GbE options.
Juniper QFX5120 Series – Modern 25/100GbE leaf and small spine options.
Juniper QFX5200 Series – 25/100GbE leaf leveraging advanced features and automation.
All Juniper Network Hardware

Comparing QFX3500 to Other Juniper & Arista Platforms
When planning a 10GbE refresh or expanding a server access layer, organizations commonly compare QFX3500 switches to later QFX platforms and competing L2/L3 switches. BrightStar Systems can help you evaluate performance, features, and long-term growth paths.

Juniper QFX5100 Series – More modern 10/40GbE platform with rich virtualization and EVPN support.
Arista 7050X Series – Common competitor for 10/40GbE leaf and rack-level switching.
Arista 7280 Series – Deep-buffered platforms used in routing-heavy leaf and DCI roles.

Our engineers can help you determine whether QFX3500 is the right fit based on port density, uplink requirements, latency needs, and your roadmap for 25GbE or 100GbE upgrades.
Popular Juniper QFX3500 Models
Below are some of the most common QFX3500 switches and accessories we see in enterprise and data center deployments:

QFX3500-48S4Q – 48 × 1/10GbE SFP+ ports with 4 × 40GbE QSFP+ uplinks for high-density top-of-rack or aggregation roles.
QFX3500-48S4Q-ACR – QFX3500-48S4Q variant with specific AC power and airflow configuration, ideal for data centers standardizing on front-to-back cooling.
QFX3500-FAN-AFO – Fan module for QFX3500 switches with AFO (airflow out) cooling orientation used to maintain proper thermal performance.

To check availability of specific QFX3500 switches and spares, request a QFX3500 quote or call 916-248-4688 to speak with our team.
Juniper QFX3500 Technical Specs & Architecture
The QFX3500 Series provides a mix of performance, flexibility, and operational consistency ideal for data center access layers.

Form factor: 1RU fixed-configuration switch.
Interfaces: 48 × 1/10GbE SFP+ access ports and 4 × 40GbE QSFP+ uplinks (model dependent).
Latency: Low-latency forwarding performance for dense server racks and clustered compute.
Features: Full L2/L3 set including OSPF, BGP, VRRP, QinQ, and advanced VLAN features.
Converged networking: Suitable for converged storage and compute environments on supported designs.
Software: Junos OS for a consistent operational experience across QFX and MX platforms.

This makes QFX3500 an excellent choice for environments requiring reliable 10GbE density without the cost or scale of large 40/100GbE platforms.
Common Juniper QFX3500 Use Cases

Top-of-rack switching: Connecting dense server racks with high-speed 10GbE SFP+ access.
Rack-level aggregation: 40GbE uplinks for spine or aggregation connectivity.
Clustered compute: Low-latency switching for HPC or clustered virtualization environments.
Enterprise data centers: Migrating from 1GbE to scalable 10GbE topologies.
Hybrid environments: Supporting mixed application, storage, and virtualization workloads.

Why Buy Used or Refurbished QFX3500 Switches?
QFX3500 switches deliver strong data center performance at a fraction of the cost when purchased refurbished. This makes them highly attractive for budget-constrained data center expansion or modernization projects.

Lower cost: Achieve high-density 10GbE switching without the premium of newer platforms.
Reliable performance: Proven design widely deployed for years in enterprise and cloud environments.
Faster delivery: Refurbished hardware often ships sooner than new units facing long lead times.
Quality assurance: All QFX3500 units are lab-tested, cleaned, and restored to factory defaults.
Warranty: Backed by our 1-Year In-House Warranty.

How We Test Refurbished QFX3500 Hardware
Each QFX3500 switch undergoes a complete test and validation process to ensure performance and reliability.

Initial inspection and full power-on testing.
Validation of 10GbE SFP+ and 40GbE QSFP+ ports.
Verification of fan operation, power supply health, and airflow direction.
Junos OS loading, configuration clearing, and basic feature verification.
Cleaning, labeling, and packing for field deployment.

QFX3500 Lifecycle, Support & Replacement Planning
QFX3500 is a stable and mature platform still used effectively in many data centers. Organizations commonly pair QFX3500 with newer QFX leaf/spine platforms during multi-year refresh cycles.

Lifecycle stage: Widely deployed and cost-effective for 10GbE access layers.
Software: Supported on Junos trains suitable for enterprise and data center roles.
Upgrade paths: QFX5100, QFX5120, and QFX5200 as next-generation replacements.
Coexistence: QFX3500 commonly used alongside QFX5100 and MX Series routers.

QFX3500 Resources & Deep-Dive Guides
If you are evaluating broader QFX architectures, our QFX Series guide provides additional insight into where QFX3500 fits alongside QFX5100, QFX5120, and QFX5200.

In-Depth Look at Juniper QFX Series Switches

If you need help designing or refreshing your QFX-based fabric, our engineers can assist with best-practice recommendations and hardware selection.
QFX3500 Buy-Back & Trade-In Options
BrightStar Systems can also help you recover value from used or surplus QFX3500 switches.

Competitive buyback offers for QFX3500 switches and accessories.
Support for data center decommissioning and rack consolidation projects.
Ability to apply recovered value toward replacement QFX or MX platforms.

QFX3500 Expertise from Juniper-Focused Network Engineers
BrightStar Systems is an engineering-focused reseller with extensive experience deploying Juniper QFX platforms across data centers and enterprise environments.

Design assistance for 10GbE top-of-rack and aggregation layers.
Guidance on optics, uplink planning, rack design, and airflow/power requirements.
Help standardizing QFX3500 with QFX5100, QFX5120, and QFX5200 for multi-year migrations.

Whether you are modernizing an existing 10GbE environment or building a new server access layer, our team can help you select the right QFX3500 configurations before you buy.
FAQ – Juniper QFX3500 Series
Q: What are the primary use cases for QFX3500 switches?
A: QFX3500 switches are commonly used for 10GbE top-of-rack switching, low-latency HPC environments, clustered compute, and transitional data centers migrating from 1GbE.

Q: Does QFX3500 support 40GbE uplinks?
A: Yes. QFX3500 platforms provide multiple 40GbE QSFP+ uplinks for aggregation or spine connectivity.

Q: Are your QFX3500 switches used or refurbished?
A: BrightStar Systems specializes in used and refurbished Juniper hardware. All QFX3500 units are lab-tested, cleaned, restored to defaults, and backed by our 1-Year In-House Warranty.

Q: Do you buy used QFX3500 hardware?
A: Yes. BrightStar Systems actively buys QFX3500 switches and accessories through our Juniper buyback program.

Q: What are the best upgrade options from QFX3500?
A: Common upgrade paths include QFX5100 for 10/40GbE, and QFX5120 or QFX5200 for 25/100GbE fabrics. Our engineers can help you plan a seamless migration.
Request QFX3500 Pricing or Sell Your QFX3500 Hardware

Request QFX3500 Pricing
Sell Your Juniper QFX3500 Switches

Looking to buy or sell additional Juniper hardware?

Buy Used Juniper Switches & Routers
Sell Used Juniper Equipment