Product Overview
The QFX5120-48Y-AFO2 is a high-performance, compact Layer 3 data center switch from Juniper Networks, optimized for 10GbE, 25GbE, and 100GbE environments. It features 48 x 10/25GbE SFP28 ports and 6 x 40/100GbE QSFP28 uplink ports, delivering up to 3.6 Tbps switching capacity. The AFO2 variant supports front-to-back airflow with redundant fans and dual hot-swappable power supplies, making it ideal for leaf-and-spine architectures, data center interconnects, and high-performance enterprise core networks.
Product Details
| Attribute | Description |
| Product Name | QFX5120-48Y-AFO2 |
| Brand | Juniper Networks |
| Port Configuration | 48 x 10/25GbE SFP28, 6 x 40/100GbE QSFP28 |
| Max Switching Capacity | 3.6 Tbps |
| Forwarding Rate | 2.6 Bpps |
| Form Factor | 1U rack-mountable |
| Airflow Direction | Front-to-back (AFO2) |
| Power Supplies | Dual hot-swappable AC power supplies (included) |
| Cooling | Redundant hot-swappable fans |
| OS | Junos OS with EVPN-VXLAN, BGP, OSPF, ISIS support |
| Ideal Use Cases | Leaf/Spine fabric, IP Clos, enterprise core, 5G edge, cloud networking |
Key Features
48 dual-speed 10GbE/25GbE SFP28 ports for server connectivity
6 high-performance 40GbE/100GbE uplink ports for spine or DCI
Front-to-back airflow (AFO2) for hot-aisle containment in modern data centers
Supports L2, L3, EVPN-VXLAN, MPLS, and rich telemetry features
MACsec, LLDP, BFD, and Virtual Chassis Fabric (VCF) support
Flexible interface breakout options: 100G to 4x25G or 40G to 4x10G
Ideal for cloud-scale leaf deployments, storage connectivity, and 25G migration
Junos OS automation with Python, REST APIs, and event scripting
Technical Specifications
| Specification | Value |
| Ports | 48 x 10G/25G SFP28, 6 x 40G/100G QSFP28 |
| Max Switching Capacity | 3.6 Tbps |
| Forwarding Rate | 2.6 billion pps |
| Airflow | Front-to-back (AFO2) |
| Power Supply | Dual hot-swappable AC |
| Fan Trays | Redundant, hot-swappable |
| OS | Junos OS |
| Layer Support | L2, L3, EVPN-VXLAN, MPLS, BGP, OSPF, ISIS |
| Form Factor | 1U |
| MACsec | Supported on select ports |
| Operating Temperature | 0°C to 40°C |
Similar Models Comparison
| Model | Downlink Ports | Uplink Ports | Airflow | Max Capacity | Use Case |
| QFX5120-48Y-AFO2 | 48 x 25G SFP28 | 6 x 100G QSFP28 | Front-to-back | 3.6 Tbps | Leaf switch, enterprise core |
| QFX5120-48Y-AFI2 | 48 x 25G SFP28 | 6 x 100G QSFP28 | Back-to-front | 3.6 Tbps | Data center hot-aisle design |
| QFX5120-32C | 32 x 100G QSFP28 | — | Variable | 6.4 Tbps | Spine or high-density aggregation |
| QFX5130-48Y | 48 x 25G SFP28 | 8 x 100G QSFP28 | Variable | 4.8 Tbps | 400G-ready networks (w/ ASIC) |
