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High density SFP+ ports with excellent reliability.
QFX5100-48S-3AFI
QFX5100, 48 SFP+/SFP ports, 6 QSFP+ ports, redundant fans, 2...
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QFX5100-48S-3AFI
QFX5100, 48 SFP+/SFP ports, 6 QSFP+ ports, redundant fans, 2...
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QFX5100-48S-3AFI is engineered with a robust architecture designed for high-density data center environments, featuring a fixed rack-mount form factor that supports both redundant and AC power supply options. The switch offers 48 SFP ports for diverse fiber connectivity and delivers high performance with low latency, making it ideal for critical network roles where stacking and scalability are essential.
The design of QFX5100-48S-3AFI emphasizes reliability and advanced network capabilities, supporting both Layer 2 and Layer 3 operations with a future-proof switching capacity. Its architecture ensures seamless expansion, exceptional throughput, and efficient power management, making it a strong fit for cloud data centers, enterprise aggregation, and high-speed server clusters.
QFX5100-48S-3AFI price is is available on request. Get immediate quote.
Request bulk order quote for QFX5100-48S-3AFI for additional pricing. Browse the full Juniper Qfx5100 Series Switches series or explore all Juniper products.
In a 2,000-server enterprise data center, deploy the QFX5100-48S-3AFI-QFX5100 as a leaf switch with 48 SFP+/SFP server ports and 6 QSFP+ uplinks to spine routers. Redundant fans, dual AC power supplies and back-to-front airflow guarantee 24/7 operation in high-density racks. Outcome: non-blocking 10/40 GbE fabric delivers sub-microsecond latency, simplifies scaling and boosts VM east-west throughput by 35%.
In a telecom central office, use the QFX5100-48S-3AFI-QFX5100 to aggregate 48 SFP+/SFP fronthaul links from remote radio units and provide 6 QSFP+ 40 GbE uplinks to the core. Front-to-back airflow aligns with standard telco racks, while redundant fans and dual AC power maximize uptime. Outcome: consistent sub-100 µs latency, carrier-grade reliability and 50% reduction in cooling footprint.
Connect 48 GPU compute nodes via SFP+ and aggregate to a 6-node spine fabric over QSFP+ using the QFX5100-48S-3AFI-QFX5100. Back-to-front airflow and N+1 fans keep temperature under control in GPU-dense racks, while dual AC power ensures zero interruption. Outcome: scalable 10/40 GbE interconnect lowers cluster jitter by 40%, accelerating model training times by 25%.
To get the detailed certification, please go to the Compliance Center.
 QFX5100-48S-3AFI |  QFX5100-48S-3AFO |  QFX5100-24Q-3AFO |  QFX5100-48S-D-3AFO |  QFX5100-96S-AFI | |
|---|---|---|---|---|---|
| Depth | 18 inches | 18 inches | 17 inches | 18 inches | 18 inches |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10G |
| Flash Memory | 256 MB | 256 MB | 256 MB | 64 MB | 256 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.7 inches | 1.75 inches | 1.73 inches | 1.75 inches | 1.75 inches |
| IOS | IP Services | IP Services | IP Lite | IP Services | N/A |
| Interface Ports | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10G |
| Layer Supported | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 3 | Layer 2 / Layer 3 | Layer 2 / Layer 3 |
| Manageable | Managed | Managed | Managed | Managed | Managed |
| Manufacturer Part Number | QFX5100-48S-3AFI | QFX5100-48S-3AFO | QFX5100-24Q-3AFO | QFX5100-48S-D-3AFO | QFX5100-96S-AFI |
| Media Type Supported | Fiber | Fiber | Fiber | Fiber | Fiber |
| Memory | 4 GB | 512 MB | 4 GB | 256 MB | 4 GB |
| Number of Downlink Ports | 48 Ports | 48 Ports | 24 Ports | 48 Ports | N/A |
| Number of Ethernet Ports | 24–48 Ports | 24–48 Ports | 12–24 Ports | 24–48 Ports | Over 48 Ports |
| POE Support | Non POE | Non POE | Non POE | Non POE | Non POE |
| Port/Expansion Slot Details | N/A | N/A | 24 QSFP+ ports | 48 x 1/10GbE SFP ports, 4 x 40GbE QSFP+ uplink ports | N/A |
| Power Consumption | 250 W | 350 W | 370W | 265 W | N/A |
| Power Source | Redundant Power Supply / AC Power Supply | Redundant Power Supply / AC Power Supply | AC Power Supply | Redundant Power Supply / AC Power Supply | Redundant Power Supply / AC Power Supply |
| Product Name | Juniper QFX5100-48S-3AFI | Juniper QFX5100-48S-3AFO Switch | Juniper QFX5100-24Q-3AFO | Juniper QFX5100-48S-D-3AFO | Juniper QFX5100-96S-AFI |
| Product Type | Switch | Switch | Switch | Switch | Switch |
| Rack Units | 1 RU | 1 RU | 1 RU | 1 RU | 1 RU |
| Redundant Power Supply Supported | Yes | Yes | No | Yes | Yes |
| SFP Ports | 48 SFP Ports | 48 SFP Ports | N/A | 48 SFP Ports | 96 SFP Ports |
| Switching Capacity | 1280 Gbps | 1280 Gbps | 1440 Gbps | 1280 Gbps | 2560 Gbps |
| Switching Capacity with Stacking | 1280 Gbps | 2560 Gbps | N/A | N/A | N/A |
| Uplink Configuration | 40G | 40G | 40G | 10G | 10G |
| Weight | 15 lbs | 14 lbs | 8 lbs | 20 lbs | 30 lbs |
| Width | 17.5 inches | 19 inches | 17.5 inches | 17.5 inches | 17.5 inches |
High density SFP+ ports with excellent reliability.
Consistent performance in leaf deployments.
Airflow-in suited our racks well.
Stable under heavy traffic.
Good value for capacity.
The Juniper QFX5100-48S-3AFI is a high-performance data center switch offering 48 SFP+/SFP ports, 6 QSFP+ ports, redundant fans, dual AC power supplies and back-to-front airflow for scalable leaf-spine deployments.
It supports 48 full-duplex SFP+/SFP ports at up to 10 GbE and 6 QSFP+ ports at up to 40 GbE, enabling flexible uplinks or spine connections in modern data centers.
Designed for low latency and high throughput, it delivers up to 1.44 Tbps switching capacity and sub-650 ns port-to-port latency for demanding virtualization and cloud workloads.
Its leaf-spine optimized design, rich port density and Junos OS integration make it ideal for large-scale cloud, virtualization, and software-defined network fabrics.