Juniper QFX5120-48Y - 48 × 25GbE SFP28 + 8 × 100GbE QSFP28, 1U, High-Performance Data Centre Switch

Juniper QFX5120-48Y is a high-performance, fixed 1U top-of-rack (ToR) data centre switch designed for next-generation enterprise and cloud environments. Featuring 48 × 25GbE SFP28 downlink ports and 8 × 100GbE QSFP28 uplinks, the switch delivers a flexible, scalable, and ultra-low-latency solution for modern applications, including cloud infrastructure, high-performance computing (HPC), storage networking, and enterprise data centres.

Powered by Junos OS, the QFX5120-48Y supports EVPN-VXLAN, automation frameworks, real-time telemetry, and advanced Layer 2/Layer 3 features, ensuring seamless integration into existing and evolving architectures. With its robust hardware design, high port density, and versatile connectivity options, it provides the scalability and operational efficiency required for AI/ML workloads, multi-cloud deployments, and edge computing.

KEY FEATURES:

• Total Ports: 48 × 25GbE SFP28 ports and 8 × 100GbE QSFP28 uplink ports
• Port Flexibility: QSFP28 uplinks support breakout into 4 × 25GbE or 4 × 10GbE lanes
• Switching Capacity: 2/4 Tbps (uni/bidirectional)/2 Bpps
• Forwarding Rate: Up to 2.4 Bpps line-rate forwarding
• CPU: 2.2 GHz quad-core Intel
• System Memory: 16 GB
• Onboard Storage: 50 GB SSD 
• Packet Buffer: 32 MB shared packet buffer
• MAC Address Table: Up to 288,000 MAC addresses
• VLAN Support: Up to 4,094 VLANs
• Jumbo Frames: Supports up to 9,216 bytes maximum frame size
• Latency: As low as 800 ns, ideal for latency-sensitive applications
• Resiliency: Dual hot-swappable AC or DC power supplies, redundant variable-speed fans, nonstop routing and software upgrades
• Airflow Options: Front-to-back (AFO) or back-to-front (AFI) airflow choices
• Form Factor: 1U compact rack-mountable chassis with efficient cooling design
• Advanced Features: EVPN-VXLAN, MACsec AES-256 encryption, Junos OS automation, Zero-Touch Provisioning (ZTP), streaming telemetry

TECHNICAL SPECIFICATION:

HARDWARE:

PERFORMANCE:

SECURITY:

MANAGEMENT:

PHYSICAL AND ENVIRONMENTAL:

ADVANCED FEATURES:

EVPN-VXLAN:

The QFX5120-48Y delivers robust support for Ethernet VPN (EVPN) combined with Virtual Extensible LAN (VXLAN), enabling the creation of flexible, multi-tenant, and highly scalable data centre networks. EVPN-VXLAN allows seamless workload mobility across distributed environments while maintaining consistent Layer 2 connectivity over a Layer 3 fabric. This capability is crucial for enterprises and cloud operators that need to extend services across multiple data centres, provide network segmentation for tenants, and simplify operational management using standards-based interoperability.

MACsec Security:

Security is integrated at the hardware level with IEEE 802.1AE MACsec AES-256 encryption, providing wire-speed, hop-by-hop protection for traffic traversing the switch. This ensures data confidentiality and integrity by preventing man-in-the-middle attacks, eavesdropping, and data tampering. Combined with advanced security measures such as role-based access control (RBAC), fine-grained access control lists (ACLs), and strong authentication protocols like RADIUS and TACACS+, the QFX5120-48Y offers an enterprise-grade security posture suitable for industries with strict compliance requirements.

Automation and Programmability:

The switch is designed to simplify operations through automation. With Zero-Touch Provisioning (ZTP), administrators can deploy new devices rapidly without manual intervention. Open APIs, Python scripting, and Junos automation tools enable integration into CI/CD pipelines, supporting intent-based networking and reducing configuration errors. Compatibility with modern orchestration platforms, including OpenStack, Ansible, and Kubernetes, ensures the QFX5120-48Y can serve as the foundation of automated and cloud-native data centre environments. This makes it future-ready for DevOps-driven network operations.

Real-Time Telemetry and Analytics:

The QFX5120-48Y continuously streams high-frequency telemetry data, providing granular visibility into traffic flows, interface utilisation, and system health metrics. Unlike traditional polling methods, this push-based telemetry model enables near real-time monitoring and predictive analytics. When integrated with analytics platforms, it allows operators to detect anomalies quickly, forecast capacity requirements, and proactively address issues before they affect user experience or application performance. This transforms network management from reactive troubleshooting to proactive optimisation.

High Availability and Resiliency:

Built for environments where uptime is non-negotiable, the QFX5120-48Y incorporates redundant, hot-swappable AC or DC power supplies and fan trays. Hardware redundancy is complemented by software resiliency features such as Nonstop Routing (NSR), Graceful Routing Engine Switchover (GRES), and hitless software upgrades, which allow network maintenance and upgrades to occur without downtime. This level of resiliency is especially critical for financial trading, healthcare, telecommunications, and large-scale enterprise operations that demand continuous service availability.

Performance Optimisation:

Offering up to 4.0 Tbps of switching capacity and up to 2.4 Bpps of forwarding performance, the QFX5120-48Y is engineered for high-performance workloads. It features ultra-low latency of ~550 ns, ensuring consistent performance for applications such as high-frequency trading, artificial intelligence/machine learning clusters, and HPC workloads. With support for 48 × 25GbE SFP28 ports and 8 × 100GbE QSFP28 uplinks, including breakout options for 10GbE and 50GbE, the switch provides maximum flexibility in connectivity and future scaling.

Junos OS Reliability:

Powered by Junos OS, the QFX5120-48Y inherits decades of stability, security, and operational excellence. Junos provides a unified feature set across switching, routing, and security platforms, reducing the learning curve and simplifying operations. It supports programmability and automation through native APIs, event-driven scripts, and integrations with orchestration tools. Its proven reliability and modular architecture help ensure that updates and new features can be deployed with minimal disruption, giving IT teams confidence in long-term support.

Cloud-Ready Infrastructure:

As enterprises and service providers move toward hybrid-cloud and multi-cloud models, the QFX5120-48Y is positioned as a strategic enabler of this transition. Its support for EVPN-VXLAN overlays, automation-driven deployment models, real-time telemetry, and high-density port configurations make it ideal for cloud-scale architectures. It can serve as a high-performance leaf switch in a spine-leaf data centre fabric or as a top-of-rack (ToR) switch for server connectivity. Its scalability, combined with operational simplicity, ensures it can meet evolving workloads at the edge, in private data centres, or across multi-cloud ecosystems.

ORDERING INFORMATION:

WARRANTY & SUPPORT:

Manufacturers are responsible for warranties, which are based on the purchase date and validity. We make sure the products we sell are delivered on time and in their original condition at Grabnpay. Whether it's physical damage or operational issues, our team will help you find a solution. We help you install, configure, and manage your devices. We'll help you file a warranty claim and guide you every step of the way.

All listed prices reflect standard market rates. Final commercial terms, including volume-based discounts, will be provided based on purchase volume, MOQ, and other applicable criteria. For more information about switches & other accessories, contact our technical support team.