The Juniper QFX5120-48Y-AFI is a high-performance, low-latency data center switch designed for modern enterprise, cloud, and spine-leaf network architectures. It belongs to the Juniper QFX5120 Series and is optimized for high-density 25G server access with powerful 100G uplink capabilities.
This model features 48x SFP28 ports supporting 1G/10G/25G Ethernet, along with 8x QSFP28 uplink ports supporting 40G and 100G connectivity, providing flexible and scalable networking for high-speed environments.
The AFI (Airflow In) variant is designed with back-to-front airflow, meaning air is pulled in from the rear and exhausted through the front—ideal for specific data center rack cooling designs.
Built in a compact 1U form factor, the switch delivers wire-speed Layer 2 and Layer 3 performance with up to 4 Tbps throughput and ultra-low latency (around ~800 nanoseconds), making it suitable for high-performance workloads.
It runs on Juniper Junos OS, offering advanced networking features such as EVPN, VXLAN, MPLS, BGP, and automation capabilities for scalable and programmable data center operations. It also supports breakout configurations, allowing each 100G port to be split into multiple 25G or 10G connections for increased port density.
The switch includes redundant power supplies and hot-swappable fan modules, ensuring high availability and reliability in mission-critical environments.
It is widely used in Top-of-Rack (ToR), leaf layer, and aggregation deployments, especially in environments requiring high bandwidth, low latency, and flexible scalability.
