The Juniper QFX5120-48Y is a flagship leaf switch for data centre racks that need practical 25GbE server access with clean uplinks into the wider fabric. Its Layer 3 design and hot-swappable power supplies help modernise infrastructure with resilient, high-throughput connectivity.
Modern rack-scale environments need dense server connectivity, predictable east-west throughput and clean paths into the wider fabric as application demands keep rising.
Juniper QFX5120-48Y is a leaf switch for data centre deployments where many servers need 25GbE access without forcing an immediate jump to 100GbE at the host. Its 48×SFP28 + 8×QSFP28 port mix suits consolidated racks that still need headroom for uplinks and fabric expansion.
With 4000 Gbps switching capacity, the platform is built to carry high volumes of rack traffic between compute, storage and adjacent network tiers. That makes it a practical fit when oversubscription, latency and port density all have to be balanced in the same leaf layer.
The result is a cleaner way to modernise server connectivity, extend rack-scale capacity and keep the network layout aligned with evolving workloads. It gives infrastructure teams a straightforward path to higher-speed access while preserving fabric simplicity.
If you are planning a rack refresh or leaf/spine expansion, our team can help you evaluate the Juniper QFX5120-48Y for your production environment.
The Juniper QFX5120-48Y is a data center switching platform for high-density leaf-spine and aggregation deployments, delivering a scalable network foundation for modern enterprise and cloud environments.
High-Density Server Connectivity
The platform supports 48x SFP28 ports for dense access-layer connectivity in data center networks.
Uplink Fabric Expansion
The platform includes 8x QSFP28 uplink ports for high-bandwidth aggregation and spine connections.
100G-Focused Architecture
The switching design supports up to 100G speed for high-throughput fabric and uplink roles.
High-Capacity Switching Core
The switch provides 4000 Gbps of switching capacity to sustain demanding east-west traffic patterns.
Fabric-Oriented Deployment
The architecture is suited to structured leaf-spine designs that simplify scaling and network segmentation.
Capacity Headroom
The platform’s switching resources are designed to maintain performance as port utilization and traffic density increase.
Aggregation Flexibility
The port mix supports both server-facing access and upstream aggregation within a single switching platform.
If you are planning a high-density data center fabric, our team can help align the QFX5120-48Y with your access, aggregation, and spine connectivity requirements.
| Product Family | Juniper QFX |
|---|---|
| Product Series | QFX5120 |
| Deployment | Data Centre |
| Target Organisation Size | Enterprise |
| Primary Use Case | Leaf |
| Product Tier | Flagship |
| Network Architecture | Layer 3 |
| Access Ports | 48 |
| Access Port Architecture | SFP28 |
| Uplink Ports | 8 |
| Uplink Architecture | QSFP28 |
| Total Ports | 56 |
| Maximum Port Speed | 100G |
| Port Configuration | 48×SFP28 + 8×QSFP28 |
| PoE | No |
| Stacking | Supported |
| Operating System | |
| Power Redundancy | Hot-swappable PSUs |
| Maximum VLANs | 4096 |
| Routing Capability | Dynamic |
| Switching Capacity (Gbps) |
The Juniper QFX5120-48Y is a 25GbE leaf switch for data centre racks and service environments that need dense server connectivity, predictable latency and clean 100GbE uplinks. It fits teams standardising east-west traffic without moving every host to 100GbE.
In colocation and enterprise data centres, rack designs often centre on many 10/25GbE servers with a smaller number of uplinks. This switch supports that balance, reducing oversubscription pressure while keeping spine connectivity simple.
Platform and engineering teams running build, test and virtualisation clusters need fast server-to-server movement without wasting ports on oversized host links. The QFX5120-48Y gives dense 25GbE access for lab-to-production fabrics.
Finance environments with reporting, risk and back-office workloads usually need low-latency access across many servers, not a full 100GbE port per host. This model supports that scale with practical 25GbE density.
Media teams handling large files, shared storage and render nodes need sustained throughput between many production systems. The QFX5120-48Y provides 25GbE server links and 100GbE uplinks for efficient rack-level traffic flow.
Telecoms and service providers often deploy dense service racks where host ports, latency and fabric cleanliness all matter. This switch fits NFV and edge-cloud layouts that need 25GbE access into a wider 100GbE fabric.
Our team can help design and deploy Juniper QFX5120-48Y switching for data centres, engineering platforms, finance, media production and telecoms racks, with the right uplink plan, resilience model and operating approach for your environment.
Many of our vendor partners offer their own flexible finance programs, available for orders over a certain threshold.
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Below you’ll find alternative models, suitable software and services that pair with this solution – helping you to avoid compatibility issues, reduce support overhead and deploy with confidence.
Not all deployments fit standard configurations. If you’re weighing up options or want a second opinion on your setup, our team is here to help with honest, straightforward advice backed by decades of vendor knowledge.
