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High density SFP+ ports with excellent reliability.
QFX5100-48S-3AFI
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QFX5100, 48 SFP+/SFP ports, 6 QSFP+ ports, redundant fans, 2...
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QFX5100-48S-3AFI
- Description:
- QFX5100, 48 SFP+/SFP ports, 6 QSFP+ ports, redundant fans, 2 AC power supplies, back to front airflow
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- Brand:
- Juniper
- GTIN:
- 11110638595
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QFX5100-48S-3AFI Overview
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.
QFX5100-48S-3AFI Specifications
- Product Type
- Switch
- Power Source
- Redundant Power Supply / AC Power Supply
- Layer Supported
- Layer 2 / Layer 3
- Form Factor
- Rack-mount
- Power Consumption
- 250 W
- Number of Ethernet Ports
- 24–48 Ports
- Number of Downlink Ports
- 48 Ports
- Manageable
- Managed
- Ethernet Technology
- 10/100/1000
- Media Type Supported
- Fiber
- Redundant Power Supply Supported
- Yes
- Manufacturer Part Number
- QFX5100-48S-3AFI
- Uplink Configuration
- 40G
- IOS
- IP Services
- POE Support
- Non POE
- SFP Ports
- 48 SFP Ports
- Memory
- 4 GB
- Rack Units
- 1 RU
- Interface Ports
- 10/100/1000
- Port/Expansion Slot Details
- N/A
- Flash Memory
- 256 MB
- Switching Capacity
- 1280 Gbps
- Switching Capacity with Stacking
- 1280 Gbps
- Product Name
- Juniper QFX5100-48S-3AFI
- Height
- 1.7 inches
- Width
- 17.5 inches
- Depth
- 18 inches
- Weight
- 15 lbs
QFX5100-48S-3AFI Use Case
Enterprise Spine-Leaf Architecture with QFX5100-48S-3AFI-QFX5100
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%.
Telco 5G C-RAN Fronthaul Switching Using QFX5100-48S-3AFI-QFX5100
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.
High-Performance AI/ML Cluster Networking with QFX5100-48S-3AFI-QFX5100
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%.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 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 |
Reviews & Ratings
E
Elliot Fenton
4
Consistent performance in leaf deployments.
M
Malcolm Reeves
5
Airflow-in suited our racks well.
J
Jonas Pembury
4
Stable under heavy traffic.
C
Cedric Bolton
4
Good value for capacity.
Questions & Answers
What is the Juniper QFX5100-48S-3AFI switch and its key features?
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.
What port speeds and types does the QFX5100-48S-3AFI support?
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.
What performance can I expect from the QFX5100-48S-3AFI?
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.
Which data center architectures is the QFX5100-48S-3AFI ideal for?
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.
How does the QFX5100-48S-3AFI ensure power and cooling redundancy?
It includes two hot-swappable AC power supplies and redundant front-to-back fans to maintain uninterrupted operation and prevent single points of failure.
What is the airflow direction in the QFX5100-48S-3AFI?
This model uses back-to-front airflow, aligning with standard data-center cooling aisles and simplifying rack integration for hot-aisle/cold-aisle containment.
How is the QFX5100-48S-3AFI managed and configured?
It runs Juniper’s Junos OS, offering a single consolidated CLI, automation via Python and REST APIs, and full integration with Juniper Networks Contrail and Junos Space.
What licensing and software features are available?
Junos OS comes standard with Layer 2/3, MPLS, EVPN/ VXLAN and full IPv4/IPv6 support. Optional feature licenses include advanced QFabric, virtual chassis, and MACsec encryption.
Can the QFX5100-48S-3AFI be deployed in a Virtual Chassis configuration?
Yes, it supports Virtual Chassis technology, enabling up to 10 units to operate as a single logical switch for simplified management and increased port density.
What security features does the QFX5100-48S-3AFI offer?
It delivers MACsec encryption, dynamic ACLs, storm control, DHCP snooping and robust DoS/ DDoS protection to secure east-west and north-south traffic.
How do I integrate the QFX5100-48S-3AFI into a leaf-spine network?
Connect SFP+/SFP access ports to servers and QSFP+ spine ports to aggregation switches. Enable EVPN-VXLAN or MLAG for seamless east-west scaling and redundancy.
What is the typical power consumption of the QFX5100-48S-3AFI?
Typical power draw is 320 W under full load, with a maximum of 600 W including both power supplies, making it energy-efficient for 10/40 GbE operations.
How does the QFX5100-48S-3AFI support high availability?
It features redundant power, fans and in-service software upgrades (ISSU) in dual-rack-unit clusters to minimize maintenance windows and prevent downtime.
What monitoring and troubleshooting tools are available?
Use Junos CLI, SNMP, Juniper Network Director and Telemetry integrations for real-time analytics, automated alerts and deep packet buffering during fault isolation.
What warranty and support options are offered?
Juniper provides a one-year limited warranty, with optional Juniper Care support for 24×7 technical assistance, hardware replacement and software updates.
Where can I purchase the QFX5100-48S-3AFI?
You can order through Juniper’s global network of authorized resellers, distribution partners or directly via Juniper’s e-commerce portal for fast delivery.