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Titus Rush
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Exceptional 25G density. The managed features are powerful and the switching fast.
QFX5120-48Y-AFI2
Juniper Networks QFX Series QFX5120-48Y - switch - 48 ports...
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Name:
QFX5120-48Y-AFI2
- Description:
- Juniper Networks QFX Series QFX5120-48Y - switch - 48 ports - managed - rack-mountable
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Juniper
- GTIN:
- 832938097926
- Condition:
- Warranty:
- 3
- List Price:
$32,865.00
- Price:
$7,261.0077.9% off
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1
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QFX5120-48Y-AFI2 Overview
QFX5120-48Y-AFI2 is a high-performance data center switch engineered with a scalable architecture that supports advanced Layer 2 and Layer 3 functionalities. It features versatile power options with redundant power supply support, comprehensive port configurations, and a design that facilitates stacking and easy expansion, delivering consistent non-blocking performance for demanding applications.
QFX5120-48Y-AFI2 is optimized to handle high throughput with low latency, making it ideal for modern data centers, cloud environments, and micro-segmentation applications. Its robust design and reliable performance have been tailored for a wide range of network use cases, providing both enhanced scalability and operational flexibility in enterprise and service provider deployments.
QFX5120-48Y-AFI2 price is $7,261.00, a 77.9% saving from the Juniper list price of $32,865.00. QFX5120-48Y-AFI2 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QFX5120-48Y-AFI2 for additional pricing. Browse the full category range or explore all Juniper products.
QFX5120-48Y-AFI2 Specifications
- Product Type
- Switch
- Power Source
- Redundant Power Supply / AC Power Supply
- Layer Supported
- Layer 2 / Layer 3
- Form Factor
- Rack-mount
- Power Consumption
- N/A
- 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
- QFX5120-48Y-AFI2
- Uplink Configuration
- 40G
- IOS
- IP Services
- POE Support
- Non POE
- SFP Ports
- 24 SFP Ports
- Memory
- 4 GB
- Rack Units
- 1 RU
- Interface Ports
- 10/100/1000
- Port/Expansion Slot Details
- 48 x QSFP28 data ports and 4 x SFP28 management ports
- Flash Memory
- 256 MB
- Switching Capacity
- 6400 Gbps
- Switching Capacity with Stacking
- N/A
- Product Name
- Juniper QFX5120-48Y-AFI2 Ethernet Switch
- Height
- 1.75 inches
- Width
- 19 inches
- Depth
- 17 inches
- Weight
- 25 lbs
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| QFX5120-48Y-AFI2 |  EX4300-32F-DC |  QFX5100-24Q-AA-AFO |  QFX5100-24Q-AFI |  EX2300-24MP | |
|---|---|---|---|---|---|
| Depth | 17 inches | 10.5 inches | 10.9 inches | 12 inches | 8.5 inches |
| Ethernet Technology | 10/100/1000 | 10GbE | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Flash Memory | 256 MB | 256 MB | 256 MB | 256 MB | 64 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.75 inches | 1.75 inches | 1.75 inches | 1.75 inches | 1.75 inches |
| IOS | IP Services | IP Lite | IP Services | IP Lite | IP Lite |
| Interface Ports | 10/100/1000 | N/A | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Layer Supported | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 2 / Layer 3 | Layer 2 |
| Manageable | Managed | Managed | Managed | Managed | Managed |
| Manufacturer Part Number | QFX5120-48Y-AFI2 | EX4300-32F-DC | QFX5100-24Q-AA-AFO | QFX5100-24Q-AFI | EX2300-24MP |
| Media Type Supported | Fiber | Fiber | Fiber | Fiber | Twisted Pair / Fiber / Combo |
| Memory | 4 GB | 256 MB | 4 GB | 512 MB | 256 MB |
| Number of Downlink Ports | 48 Ports | 32 Ports | 24 Ports | 24 Ports | 24 Ports |
| Number of Ethernet Ports | 24–48 Ports | 24–48 Ports | 12–24 Ports | 12–24 Ports | 12–24 Ports |
| POE Support | Non POE | Non POE | Non POE | Non POE | POE+ |
| Port/Expansion Slot Details | 48 x QSFP28 data ports and 4 x SFP28 management ports | N/A | 24 QSFP+ ports with breakout support to 4x10GbE | 24 QSFP+ ports with 4 dedicated SFP management ports | 24 PoE ports, 4 SFP uplink ports |
| Power Consumption | N/A | 63W | N/A | 255 W | N/A |
| Power Source | Redundant Power Supply / AC Power Supply | DC Power Supply | Redundant Power Supply / AC Power Supply | Redundant Power Supply / AC Power Supply | AC Power Supply |
| Product Name | Juniper QFX5120-48Y-AFI2 Ethernet Switch | Juniper Networks EX4300-32F-DC Ethernet Switch | Juniper QFX5100-24Q-AA-AFO | Juniper QFX5100-24Q-AFI Data Center Switch | EX2300-24MP |
| Product Type | Switch | Switch | Switch | Switch | Switch |
| Rack Units | 1 RU | 1 RU | 1 RU | 1 RU | 1 RU |
| Redundant Power Supply Supported | Yes | No | Yes | Yes | No |
| SFP Ports | 24 SFP Ports | 32 SFP+ Ports | 24 SFP Ports | 24 SFP Ports | 4 SFP Ports |
| Switching Capacity | 6400 Gbps | 640 Gbps | 1440 Gbps | 1280 Gbps | 52 Gbps |
| Switching Capacity with Stacking | N/A | 640 Gbps | N/A | 2560 Gbps | 104 Gbps |
| Uplink Configuration | 40G | 10G | 40G | 40G | 1G |
| Weight | 25 lbs | 8.6 lbs | 20 lbs | 7 lbs | 10 lbs |
| Width | 19 inches | 17.5 inches | 17.7 inches | 17.5 inches | 17.5 inches |
Reviews & Ratings
S
Soren Mirren
4
High-performance data center switch. Reliable throughput and very stable under heavy traffic.
R
Remy Elba
5
Professional grade Juniper quality. 48 ports of 25G offer incredible network flexibility.
P
Porter Irons
5
Solid and dependable. The QFX5120 is essential for our modern core infrastructure.
P
Phineas Knightley
5
Stunning throughput speeds. Consistent performance and robust management for our data center.
O
Otis Neeson
4
Top-tier switching. It handles our server traffic with remarkably low latency daily.
N
Nash Smith
4
Reliable and fast. A high-density solution for demanding enterprise networking environments.
M
Milo Centineo
4
Exceptional build quality. The QFX series continues to lead in data center performance.
Questions & Answers
What is the Juniper Networks QFX5120-48Y-AFI2 switch?
The Juniper Networks QFX5120-48Y-AFI2 is a 1U, rack-mountable managed switch featuring 48 SFP28 ports and an AFI2 advanced feature license for enhanced Layer 2/3 capabilities.
How many and what types of ports does the QFX5120-48Y-AFI2 provide?
The QFX5120-48Y-AFI2 delivers 48 SFP28 ports supporting 1/10/25 GbE and six QSFP28 ports for 40 GbE or breakout to 4×10/4×25 GbE.
What is the switching capacity and throughput of the QFX5120-48Y-AFI2?
The switch offers up to 3.6 Tbps of switching capacity and a maximum forwarding rate of 2.7 billion packets per second (Bpps).
Does the QFX5120-48Y-AFI2 support Layer 2 and Layer 3 protocols?
Yes. It supports comprehensive Layer 2 features (VLAN, Spanning Tree, MLAG) and advanced Layer 3 routing (OSPF, BGP, RIP, VRF).
What management and monitoring options are available?
Management is via Junos OS CLI, Juniper’s REST API, Junos Space, SNMP, RMON, and sFlow for real-time telemetry and automation.
Which advanced features are enabled by the AFI2 license?
The AFI2 license activates EVPN-VXLAN, MPLS, advanced security (MACsec), segment routing, and comprehensive traffic analytics.
Is the QFX5120-48Y-AFI2 rack-mountable and what are its physical dimensions?
Yes. It’s a 1U, 19-inch rack-mount device measuring 44.25×1.68×20.87 cm (W×H×D) with included mounting brackets.
What power supply and redundancy options are supported?
The switch supports dual hot-swappable 750 W AC power supplies for N+1 redundancy and continuous uptime.
What is the typical power consumption of the QFX5120-48Y-AFI2?
Typical power consumption is approximately 205 W, with a maximum draw of around 350 W under full load.
How does the cooling and airflow work on this switch?
It uses front-to-back airflow with redundant, hot-swappable fans to maintain optimal operating temperatures in data center environments.
Does the QFX5120-48Y-AFI2 support Virtual Chassis technology?
Yes. It supports Virtual Chassis configurations up to 10 units, enabling single-system management and high-availability clustering.
What are the primary use cases for the QFX5120-48Y-AFI2?
Ideal for data center leaf-spine topologies, campus aggregation, and high-performance edge deployments requiring 10/25 GbE connectivity.
Which automation and programmability frameworks are supported?
It supports Junos automation tools (PyEZ), Ansible modules, Terraform providers, and native Python or REST-based scripting.
What security and compliance features are included?
Security features include MACsec encryption, dynamic MAC filtering, ACLs, DHCP snooping, ARP inspection, and DDoS mitigation.
What warranty and support options are available for this switch?
The QFX5120-48Y-AFI2 comes with a one-year limited hardware warranty and optional Juniper J-Care support for extended coverage.
How does the AFI2 model differ from the base QFX5120-48Y switch?
The AFI2 model includes an advanced feature license that unlocks EVPN-VXLAN, MPLS, MACsec, and enhanced telemetry not available in the base model.