Juniper QFX5100 Series Switches (Used & Refurbished)
The Juniper QFX5100 Series delivers high-performance, low-latency data cent...
Juniper QFX5100 Series Switches (Used & Refurbished)
The Juniper QFX5100 Series delivers high-performance, low-latency data center switching with 10GbE and 40GbE connectivity, advanced Layer 2/Layer 3 features, and EVPN-VXLAN support. BrightStar Systems supplies fully tested, used and refurbished QFX5100 switches backed by our 1-Year In-House Warranty, helping you build or expand leaf–spine fabrics at a fraction of new hardware cost.
QFX5100 switches are designed for top-of-rack (ToR), leaf, and small spine roles in modern data centers and high-performance enterprise environments. With fixed 10GbE access ports, 40GbE uplinks, and options for 100GbE on select models, the QFX5100 family fits both traditional Layer 3 designs and EVPN-VXLAN-based fabrics.
Juniper QFX5100 Series Overview
The QFX5100 line is a foundational Juniper data center platform, built on high-performance merchant silicon and Junos OS. It provides wire-speed Layer 2/Layer 3 switching, rich automation, and fabric capabilities, making it a natural fit for leaf–spine architectures or high-density aggregation.
Key features of the QFX5100 Series include:
High-density 10GbE SFP+ or 10GBASE-T access ports depending on model.
40GbE QSFP+ uplinks, with 100GbE options on select QFX5100 variants.
Low-latency, nonblocking architecture optimized for data center workloads.
Advanced Layer 2/Layer 3 features, including OSPF, BGP, MPLS, and IPv6.
EVPN-VXLAN support in appropriate Junos OS releases for fabric-based designs.
Redundant, hot-swappable power supplies and fans with front-to-back or back-to-front airflow SKUs.
Many customers deploy QFX5100 switches as ToR/leaf nodes paired with higher-capacity QFX5200 Series or QFX10000 spines, and connect upstream to Juniper MX Series routers at the WAN edge.
Explore More Juniper Switches
QFX5100 switches are part of the broader Juniper QFX and EX portfolios, and they frequently appear alongside EX access switches and MX edge routers in spine–leaf designs.
All Juniper QFX Series Switches
All Juniper EX Series Switches
Juniper EX4300 Series – Campus access with Virtual Chassis.
Juniper EX4400 Series – Mist-integrated multigigabit campus access.
Juniper QFX5120 Series – 25GbE leaf with 100GbE uplinks for modern fabrics.
Juniper SRX Series Firewalls – Secure branch, edge, and data center firewalls.
All Juniper Network Hardware
Related Juniper QFX & MX Series
Customers evaluating QFX5100 switches often compare them against other QFX subseries and MX routers for data center and core roles. Use the links below to explore platform options and roles.
Juniper QFX5200 Series – Higher-speed 25/100GbE leaf and spine platforms.
Juniper QFX10000 – High-scale spine and core switching.
Juniper MX Series Routers – Edge routing, DCI, and core services.
Juniper EX4650 Series – High-performance aggregation and distribution.
Comparing Juniper QFX5100 to Arista 7000 Series
Many data centers standardize on a single vendor, while others compare Juniper QFX5100 switches against Arista 7000-series platforms for leaf or ToR roles. BrightStar Systems supplies both Juniper and Arista hardware and can help you choose the right mix for your environment.
Arista 7050X Series – 10/40GbE data center leaf and aggregation.
Arista 7060X Series – High-density 25/100GbE leaf–spine switching.
Arista 7280 Series – Deep-buffered switches for data center and service provider networks.
Our engineers can walk through Junos OS versus Arista EOS, optics compatibility, EVPN-VXLAN capabilities, and automation tooling so you can decide between a pure-QFX architecture or a mixed-vendor design that includes Arista 7000 Series switches.
Popular Juniper QFX5100 Models
Below are some of the most frequently deployed QFX5100 switches in leaf, ToR, and high-performance aggregation roles. Availability changes over time; contact us for current stock and pricing.
QFX5100-48S-AFO – 48× 10GbE SFP+ ports with 40GbE QSFP+ uplinks and airflow-out cooling, ideal for dense 10GbE ToR.
QFX5100-48S-3AFO – 48× SFP+ 10GbE with 40GbE uplinks, low latency, and advanced automation support.
QFX5100-48S-D-3AFI – DC-powered 48× 10GbE SFP+ switch with front-to-back airflow for data center racks.
QFX5100-48T-AFO – 48× 10GBASE-T (RJ-45) ports with QSFP+ uplinks, perfect for copper-heavy racks.
QFX5100-48TH-AFI – 48× 10GbE with 40/100GbE uplinks, AFI airflow, and flexible data center deployment options.
QFX5100-24Q-3AFO – 24× 40GbE QSFP+ ports for spine, aggregation, or high-density east–west fabrics.
QFX5100-48S-DC-AFO – 48× 10GbE SFP+ with DC power and AFO airflow for power-sensitive environments.
Inventory can shift quickly. To confirm which QFX5100 models are in stock and to check pricing, request a Juniper QFX5100 quote or call 916-248-4688 to speak directly with our team.
Juniper QFX5100 Technical Specs & Architecture
The QFX5100 platform is engineered for high-performance data center fabrics, with line-rate forwarding, deep feature support, and flexible deployment options as both leaf and small spine switches.
Access ports: 10GbE SFP+ or 10GBASE-T access ports depending on model, with some variants supporting 1/10GbE.
Uplinks: 40GbE QSFP+ uplinks on most models, with options for 100GbE on select QFX5100 platforms.
Fabric support: EVPN-VXLAN and IP fabric designs when running supported Junos OS releases.
Layer 2/Layer 3: Full-featured Junos OS including VLANs, LAGs, VXLAN, OSPF, BGP, MPLS, and IPv6.
Resiliency: Redundant, hot-swappable power supplies and fans, with AFI/AFO airflow options to match rack standards.
Automation: Integration with Juniper automation tools and third-party orchestration platforms for large-scale deployments.
QFX5100 switches can be deployed in classic three-tier designs or as building blocks for EVPN-VXLAN leaf–spine architectures that extend into campus or regional data centers.
QFX5100 Model Details
QFX5100-48S Family
48× 10GbE SFP+ access ports with 40GbE QSFP+ uplinks.
Designed for high-density 10GbE ToR or leaf roles in data center racks.
Available with different airflow and power options (AC/DC, AFI/AFO) to match deployment standards.
QFX5100-48T & QFX5100-48TH
48× 10GBASE-T copper ports for racks standardizing on twisted-pair cabling.
Ideal for environments that need flexible 1/10GbE access without running fiber to every server.
Some models offer 40/100GbE uplinks, increasing longevity in evolving fabrics.
QFX5100-24Q-3AFO
24× 40GbE QSFP+ ports with expansion options for additional uplinks.
Often deployed as a compact spine, aggregation, or high-density 40GbE leaf.
Supports breakout options for 4×10GbE per QSFP+ where supported.
Compatible Optics & Uplink Modules
QFX5100 switches support a broad range of Juniper optics, DAC, and AOC cables for flexible data center designs. BrightStar Systems can bundle optics and accessories to match your fabric design and cabling standards.
Juniper SFP/SFP+/QSFP Transceivers & Cables for 10/40/100GbE connectivity depending on model.
DAC and AOC cables for short-reach, high-bandwidth links between leaf and spine layers.
QSFP+ optics and breakouts for 40GbE uplinks or 4×10GbE fan-out connections.
Power supplies and fan trays matched to AFI/AFO airflow requirements in your racks.
Our team can also help you validate optics interoperability between QFX5100, newer QFX platforms like QFX5120, and mixed-vendor environments that include Arista 7050X or 7060X switches.
Common Juniper QFX5100 Use Cases
Data center top-of-rack (ToR): 48× 10GbE models serve as ToR switches with 40GbE uplinks to leaf or spine layers.
Leaf switches in EVPN-VXLAN fabrics: QFX5100 leafs connect to QFX5200/QFX10000 spines for scale-out designs.
Compact spines or aggregation: QFX5100-24Q models aggregate multiple leafs or act as small spines.
High-performance lab and staging environments: Flexible port configurations make QFX5100 an excellent lab platform.
Migration platforms: QFX5100 can bridge older 10GbE designs and newer 25/100GbE fabrics during phased upgrades.
Why Buy Used or Refurbished QFX5100 Switches?
Many organizations still rely on QFX5100 as a core building block for data center fabrics and lab environments. Buying used QFX5100 switches from a trusted reseller can deliver strong ROI while maintaining technical flexibility.
Substantial cost savings: Reduce capital expenses compared to new hardware while staying on familiar, proven platforms.
Shorter lead times: Refurbished inventory can often ship faster than constrained new-hardware channels.
Proven reliability: QFX5100 is a mature, widely deployed data center switch family.
Mix-and-match with newer gear: QFX5100 can coexist with newer QFX and EX platforms in multi-year refresh plans.
Warranty coverage: All QFX5100 hardware from BrightStar Systems is backed by our 1-Year In-House Warranty.
How We Test Refurbished QFX5100 Switches
Our lab process is designed to ensure that used QFX5100 switches are ready for deployment in production data centers.
Initial visual inspection, power-on verification, and hardware health checks.
Port-level testing across access and uplink ports, including sample 40GbE links and breakout configurations where appropriate.
Verification of management access and control-plane stability under load.
Loading a compatible Junos OS release and resetting configurations to factory defaults.
Cleaning, re-labeling, and carefully packaging each unit for shipment.
Each QFX5100 we ship is documented in our internal systems with test results, helping us support any future questions during its lifecycle.
QFX5100 Lifecycle, Support & Replacement Planning
The QFX5100 has been a core Juniper data center switch for years and remains widely deployed. Many customers continue to use QFX5100 in production while gradually introducing newer QFX platforms.
Lifecycle stage: mature, well-understood platform with a long track record in data centers.
Software support: Supported Junos OS trains provide ongoing feature and security updates for QFX5100.
Upgrade paths: QFX5200, QFX5120, and QFX10000 platforms offer higher speed and scale for future designs.
Coexistence: QFX5100 can operate alongside EX access switches and QFX spines during phased migrations.
QFX5100 Buy-Back & Trade-In Options
If you are refreshing data centers, consolidating environments, or moving to newer QFX platforms, BrightStar Systems can help you recover value from surplus QFX5100 hardware.
Buyback offers for QFX5100 and other Juniper QFX and EX models.
Support for full or partial data center decommissioning projects.
Ability to apply recovered value toward QFX5200, QFX5120, QFX10000, MX routers, or even Arista 7000 Series switches.
For larger projects, you can align your plan with our data center decommissioning checklist to minimize risk and maximize asset recovery.
QFX5100 Expertise from Juniper-Focused Network Engineers
BrightStar Systems is an engineering-focused reseller with deep experience designing and supporting Juniper-based data center fabrics.
Hands-on experience with QFX5100 in leaf–spine, EVPN-VXLAN, and traditional Layer 3 designs.
Guidance on how to integrate QFX5100 with QFX5200/QFX5120 spines and MX edge routers.
Assistance matching QFX5100 models, optics, power supplies, and airflow options to your standards.
If you are designing a new fabric or refreshing existing QFX5100 deployments, our team can walk through topology, models, and optics before you purchase.
FAQ – Juniper QFX5100 Series
Q: What roles are QFX5100 switches best suited for?
A: QFX5100 switches are typically deployed as top-of-rack, leaf, or compact spine devices in data center environments. They provide high-density 10GbE access with 40GbE (and on some models, 100GbE) uplinks, making them a solid fit for modern leaf–spine fabrics.
Q: Are your QFX5100 switches used or refurbished, and do they include a warranty?
A: BrightStar Systems specializes in used and refurbished Juniper hardware. All QFX5100 switches are tested in-house, cleaned, reset to factory defaults, and backed by our 1-Year In-House Warranty.
Q: Do QFX5100 switches support EVPN-VXLAN?
A: Yes. When running supported Junos OS releases, QFX5100 switches can participate in EVPN-VXLAN fabrics, often in combination with QFX5200/QFX10000 spines and MX Series routers.
Q: How do I choose between SFP+ and 10GBASE-T QFX5100 models?
A: SFP+ models are typically used in fiber-based or DAC-based designs with tight latency and power requirements, while 10GBASE-T models fit environments that prefer copper cabling to servers. Our team can help match the right models to your cabling standards and performance needs.
Q: Do you buy used QFX5100 hardware?
A: Yes. BrightStar Systems actively buys used QFX5100 switches and other Juniper hardware through our buyback programs. If you are decommissioning QFX5100 equipment, we can provide bids and handle logistics.
Q: Can you help me decide between QFX5100 and other Juniper or Arista platforms?
A: Our engineers regularly compare QFX5100 against newer QFX platforms, EX aggregation switches, MX routers, and Arista 7000 Series platforms. We can help you design the right mix of hardware based on performance, budget, and fabric requirements.
Request Pricing or Sell Your QFX5100 Equipment
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