QFX5100-48S-3AFI Juniper Networks 48-Port SFP+ Ethernet Switch.

Juniper QFX5100-48S-3AFI Overview

The Juniper QFX5100-48S-3AFI is a high-performance Ethernet switch designed for enterprise and data center networks. With robust hardware, flexible connectivity, and efficient airflow, it delivers exceptional network reliability and scalability.

Key Features of QFX5100-48S-3AFI

• Manufacturer: Juniper Networks
• Part Number: QFX5100-48S-3AFI
• Product Type: Ethernet Switch
• Port Density: 48 x 10GbE SFP+ and 6 x 40GbE QSFP+
• Management Options: RJ-45 console, dual SFP/RJ-45, and USB interfaces
• Switching Capacity: 1.44 Tbps
• Forwarding Rate: 1.08 Bpps
• MAC Address Table: 288,000 entries

Network Connectivity and Port Layout

Data Ports

• 48 x 10 Gigabit Ethernet SFP+ ports for high-speed server and device connections

Uplink and Expansion

• 6 x 40 Gigabit Ethernet QSFP+ uplink ports for core and aggregation connectivity

Management Interfaces

• 1 x RJ-45 serial console port
• 2 x dual-purpose SFP/RJ-45 management ports
• 1 x USB port for configuration and firmware updates

Hardware and Power Features

Cooling and Airflow

• Back-to-front airflow ensures optimal cooling in data center racks
• Equipped with 5 x QFX5100-FAN-AFI fan modules

Power Supply

• Dual 650W AC JPSU power supplies for redundancy and reliability

Performance Specifications

• Switching Capacity: 1.44 Tbps, supporting high-bandwidth applications
• Forwarding Rate: 1.08 billion packets per second (Bpps)
• MAC Address Table Size: 288,000 entries, enabling large-scale device connectivity

Ideal Use Cases

• Enterprise data center core and aggregation layers
• High-performance server access deployments
• Scalable and resilient network environments requiring high throughput

Juniper Networks QFX5100-48S-3AFI 48-Port Ethernet Switch

The Juniper Networks QFX5100-48S-3AFI 48-Port SFP+ and 6-Port QSFP+ with 2x JPSU Ethernet Switch B2F is a high-performance, low-latency, and highly scalable data center switching solution engineered for modern enterprise and cloud environments. Designed to meet the evolving demands of high-density virtualization, software-defined networking, and large-scale data center fabrics, this 10GbE and 40GbE switch delivers exceptional throughput, advanced Layer 2 and Layer 3 capabilities, and seamless integration into spine-leaf architectures. As part of the renowned QFX Series, the QFX5100-48S-3AFI provides a powerful foundation for organizations seeking resilient, agile, and automated network infrastructure.

High-Density 10GbE and 40GbE Connectivity

Equipped with 48 SFP+ ports supporting 10 Gigabit Ethernet and 6 QSFP+ uplink ports supporting 40 Gigabit Ethernet, the QFX5100-48S-3AFI ensures flexible connectivity options for access and aggregation layers. The SFP+ interfaces allow high-speed connections to servers, storage arrays, and other switches, while the QSFP+ ports enable high-bandwidth uplinks or breakout configurations for additional 10GbE connections. This combination ensures optimal traffic distribution, reduced bottlenecks, and consistent performance across demanding workloads such as virtualization clusters, big data platforms, and mission-critical enterprise applications.

Optimized for Spine-Leaf Architectures

The QFX5100-48S-3AFI is purpose-built for spine-leaf topologies, a preferred architecture for modern data centers due to its predictable latency and horizontal scalability. In a leaf role, the switch connects directly to servers and storage devices, delivering ultra-low latency and non-blocking throughput. When deployed as part of a larger fabric with spine switches, it ensures east-west traffic flows efficiently, supporting high-performance computing, containerized environments, and cloud-native applications.

Scalable Fabric Design for Growing Data Centers

As organizations expand their digital infrastructure, scalability becomes critical. The QFX5100-48S-3AFI offers advanced features such as Virtual Chassis technology, enabling multiple switches to operate as a single logical device. This simplifies management, enhances redundancy, and allows seamless expansion without significant architectural changes. Data centers can add capacity while maintaining operational consistency and minimizing configuration complexity.

Advanced Switching Performance and Low Latency

The QFX5100-48S-3AFI delivers wire-speed Layer 2 and Layer 3 performance with ultra-low latency, making it suitable for latency-sensitive applications including financial trading platforms, real-time analytics, and high-frequency transaction systems. Its robust hardware architecture supports high packet forwarding rates, deep buffering, and deterministic performance even under heavy traffic loads. This ensures minimal packet loss and consistent application responsiveness across the network fabric.

High Throughput for Data-Intensive Workloads

With multi-terabit switching capacity, the QFX5100-48S-3AFI efficiently handles large volumes of data traversing enterprise and cloud networks. Whether supporting converged storage traffic, virtual machine migrations, or distributed application architectures, the switch maintains optimal throughput. The ability to handle high-density connections and sustained traffic patterns makes it an ideal choice for enterprises embracing digital transformation and large-scale virtualization initiatives.

Deterministic Network Behavior

Predictable performance is essential for mission-critical workloads. The QFX5100-48S-3AFI incorporates advanced queuing, congestion management, and quality of service mechanisms to ensure fair traffic handling and prioritization. Organizations can implement granular policies that allocate bandwidth according to application requirements, ensuring that latency-sensitive traffic receives priority over less critical data flows.

Comprehensive Layer 2 and Layer 3 Capabilities

The switch supports a rich set of Layer 2 and Layer 3 protocols, enabling flexible network design and segmentation. From VLAN and VXLAN support to dynamic routing protocols such as OSPF and BGP, the QFX5100-48S-3AFI provides the tools necessary to build secure, scalable, and interoperable network infrastructures. These capabilities enable seamless integration into multi-vendor environments and hybrid cloud deployments.

VXLAN and EVPN for Network Virtualization

Modern data centers rely heavily on network virtualization to isolate tenants, applications, and services. The QFX5100-48S-3AFI supports VXLAN and EVPN technologies, enabling scalable Layer 2 overlays over Layer 3 networks. This facilitates seamless workload mobility across racks and data center pods while maintaining consistent network policies and segmentation. Organizations benefit from improved resource utilization and simplified multi-tenant environments.

Dynamic Routing and Policy Control

Support for dynamic routing protocols ensures efficient path selection and rapid convergence in the event of link or device failures. The switch’s advanced policy framework allows administrators to define granular access controls and traffic engineering strategies. These features are essential for maintaining security, compliance, and operational stability in complex enterprise networks.

Robust Redundancy and High Availability

High availability is a cornerstone of data center design, and the QFX5100-48S-3AFI addresses this requirement through redundant power supplies, hot-swappable components, and resilient architecture. The inclusion of dual JPSU power supplies enhances reliability and minimizes downtime, ensuring continuous operation even during maintenance or unexpected hardware issues.

Dual Power Supplies for Operational Continuity

The integrated 2x JPSU configuration provides power redundancy, allowing the switch to continue functioning if one power supply fails. This design reduces the risk of single points of failure and supports maintenance without service disruption. For mission-critical environments, this level of redundancy is essential to meet service-level agreements and maintain business continuity.

Hot-Swappable Components and Maintenance Efficiency

Hot-swappable fans and power supplies simplify maintenance operations and reduce mean time to repair. Network administrators can replace faulty components without powering down the switch, maintaining uptime and minimizing operational impact. This feature is particularly valuable in large data centers where even brief outages can have significant financial implications.

Flexible Deployment Options and Airflow Configuration

The B2F airflow design ensures efficient cooling and compatibility with various rack layouts. Proper airflow management is crucial in high-density data centers to prevent overheating and maintain optimal performance. The QFX5100-48S-3AFI’s airflow configuration aligns with best practices for hot aisle and cold aisle containment strategies, contributing to energy efficiency and equipment longevity.

Data Center Environmental Optimization

Effective thermal management reduces operational costs and extends hardware lifespan. The switch’s engineered airflow design supports stable performance under heavy workloads and high ambient temperatures. By aligning airflow direction with rack design, organizations can achieve efficient cooling without additional infrastructure modifications.

Automation and Simplified Management

Automation is central to modern network operations, and the QFX5100-48S-3AFI integrates seamlessly with orchestration platforms and automation frameworks. Its operating system supports programmability and open APIs, enabling rapid deployment, configuration management, and policy enforcement across large-scale environments.

Zero-Touch Provisioning and Rapid Deployment

Zero-touch provisioning capabilities allow the switch to be automatically configured upon connection to the network. This accelerates deployment in distributed data centers and remote sites, reducing manual intervention and configuration errors. Organizations can scale their infrastructure quickly while maintaining consistency and compliance with standardized templates.

Centralized Monitoring and Analytics

Comprehensive monitoring tools provide real-time visibility into network health, traffic patterns, and performance metrics. Administrators can proactively identify anomalies, optimize resource allocation, and plan capacity expansions based on actionable insights. Integrated telemetry features enhance operational intelligence and reduce troubleshooting time.

Enterprise Security and Segmentation

Security is integral to data center networking, and the QFX5100-48S-3AFI incorporates advanced mechanisms to protect against threats and unauthorized access. Access control lists, secure management interfaces, and robust authentication protocols ensure that only authorized users and devices can interact with the network infrastructure.

Granular Access Control Policies

Administrators can define detailed access policies based on user roles, device types, and application requirements. This granular control supports regulatory compliance and data protection mandates while maintaining operational flexibility. Secure segmentation prevents lateral movement of threats within the network.

Energy Efficiency and Cost Optimization

The QFX5100-48S-3AFI is engineered to balance performance with energy efficiency. Intelligent power management and optimized hardware components reduce power consumption without compromising throughput. For enterprises aiming to lower operational expenditures and meet sustainability goals, this switch offers a compelling combination of performance and efficiency.

Reduced Total Cost of Ownership

By consolidating high-density connectivity, advanced routing capabilities, and automation features into a single platform, the QFX5100-48S-3AFI lowers infrastructure complexity and management overhead. The result is a reduced total cost of ownership over the lifecycle of the network deployment, making it a strategic investment for forward-thinking organizations.