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Delivering reliable IT hardware solutions since 2009.
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Part Number: QFX5120-48Y-AFO2
Description: Juniper QFX5120-48Y-AFO2 , airflow out, redundant AC PSUs and FANs Ships with base S/W features
Category: Juniper QFX5100 Series Switches, Juniper Switches, Switches
and more
15+ Years of Proven Excellence
Delivering reliable IT hardware solutions since 2009.
Same-Day Shipping
On all on-hand orders placed before 2 pm CST.
Limited Lifetime Warranty
You’ll find warranty coverage on the majority of our hardware.*
Terms & Conditions*
The Juniper QFX5120-48Y-AFO2 delivers exceptional performance for data center server access applications with its high-density port configuration and comprehensive feature set. As part of the Juniper QFX5120 series, the QFX5120-48Y-AFO2 provides the throughput and latency characteristics needed for extremely agile data centers, enabling organizations to efficiently utilize network links while maintaining optimal application performance.
The QFX5120-48Y-AFO2 runs on a robust network operating system with process modules running independently in their own protected memory space. This architecture ensures that process restarts on the QFX5120-48Y-AFO2 maintain uninterrupted routing and forwarding operations. The QFX5120-48Y-AFO2 supports advanced routing capabilities including Border Gateway Protocol, Dynamic Internet Protocol routing, and Intra-Domain Routing Protocol.
The QFX5120-48Y-AFO2 excels as a network virtualization overlay solution for dynamic data centers. Organizations can deploy overlay networks with the QFX5120-48Y-AFO2 using either Centrally Routed Bridging Overlay or Edge Routed Bridging Overlay architectures. The QFX5120-48Y-AFO2 supports distributed edge routed gateways and MAC virtual routing, significantly increasing performance in virtualized environments.
Equipped with an intelligent buffer mechanism, the QFX5120-48Y-AFO2 optimizes the handling of both wired and wireless traffic. The QFX5120-48Y-AFO2 incorporates Weighted Random Early Detection and VLAN congestion avoidance capabilities, providing deterministic performance even during peak traffic conditions. This makes the QFX5120-48Y-AFO2 particularly well-suited for environments where wireless traffic carried over wired infrastructure creates bursty traffic patterns.
The QFX5120-48Y-AFO2 supports diverse deployment scenarios, from serving as a campus distribution switch featuring advanced capabilities to functioning as part of a collapsed spine data center architecture. Whether used to connect multiple enterprise buildings or deployed as a campus core switch, the QFX5120-48Y-AFO2 delivers the performance and reliability needed for critical network infrastructure blocks.
The Juniper QFX5120-48Y-AFO2 features a compact form factor designed for efficient deployment in various network environments. With its air-out (AFO2) cooling design, the QFX5120-48Y-AFO2 is optimized for back-to-front airflow configurations.
| Specification | Details |
| Form Factor | 1U rack-mountable |
| Dimensions (H × W × D) | 1.72″ × 17.36″ × 20.48″ |
| Weight | 24.5 lbs (11.1 kg) |
| Airflow | Back-to-front (AFO2 designation) |
| Fan Modules | Dual redundant, hot-swappable |
The QFX5120-48Y-AFO2 offers comprehensive network capabilities that can be applied across various deployment scenarios. Network administrators can leverage the QFX5120-48Y-AFO2 in Ethernet-based WAN networks, campus deployments, and data center environments.
| Port Configuration | Specifications |
| 48 × 25GbE SFP28 ports | Support for 1/10/25GbE |
| 8 × 100GbE QSFP28 ports | Support for 40/100GbE |
| Management Ports | 1 × RJ-45 console, 1 × USB, 1 × management Ethernet |
The QFX5120-48Y-AFO2 supports an extensive range of protocols essential for modern networking applications. These capabilities enable the QFX5120-48Y-AFO2 to adapt to diverse networking requirements.
| Protocol Category | Supported Protocols |
| Spanning Tree | Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), Multiple Spanning Tree Protocol (MSTP), Bridge Protocol Data Unit (BPDU) |
| Routing | Border Gateway Protocol (BGP), Dynamic Internet Protocol, Intra-Domain Routing Protocol |
| High Availability | Virtual Router Redundancy Protocol, Link Aggregation Control Protocol, Link Aggregation Groups |
| Multicast | Internet Group Management Protocol |
| Management | Internet Standard Management Framework for describing SNMP management frameworks, Simple Network Time Protocol |
| Transport | Transmission Control Protocol (TCP), User Datagram Protocol (UDP), Session Initiation Protocol (SIP) |
The QFX5120-48Y-AFO2 delivers exceptional performance metrics suitable for demanding network environments. With its flexible forwarding table and unified forwarding table architecture, the QFX5120-48Y-AFO2 enables administrators to assign forwarding class priorities according to application requirements.
| Performance Metric | Capability |
| Switching Capacity | 2 Tbps |
| Forwarding Rate | Up to 1.5 Bpps |
| Latency | Ultra-low (microseconds) |
| Buffer | 32MB shared intelligent buffer management |
| Unified Forwarding Table | User-configurable allocation |
The QFX5120-48Y-AFO2 incorporates comprehensive security measures to protect network infrastructure. From filters for secure interface login to data origin authentication, the QFX5120-48Y-AFO2 helps safeguard critical network assets.
| Security Feature | Capability |
| Access Control | Filters secure interface login, role-based authentication |
| Encryption | Link layer data confidentiality |
| Authentication | Data origin authentication, multi-factor options |
| Monitoring | Key performance indicator collection, visualization anomaly detection root cause analysis |
The QFX5120-48Y-AFO2 stands out with its combination of high-density 25GbE ports and 100GbE uplinks in a compact form factor. Unlike the QFX5120-32C, the QFX5120-48Y-AFO2 provides 48 SFP28 ports optimized for data center server access and campus distribution deployments. The “AFO2” designation specifically indicates the back-to-front airflow configuration of this model, making the QFX5120-48Y-AFO2 ideal for certain rack configurations where this airflow pattern is required.
The QFX5120-48Y-AFO2 features comprehensive support for network automation through Juniper Networks’ automation framework. Network administrators can leverage programmable APIs and integration with automation tools to streamline the deployment and management of the QFX5120-48Y-AFO2, reducing operational complexity while improving reliability and consistency of network operations.
Yes, the QFX5120-48Y-AFO2 is an excellent choice for campus fabric core distribution deployments. With its robust routing capabilities and support for campus network protocols, the QFX5120-48Y-AFO2 provides the performance and reliability needed for demanding campus environments. The QFX5120-48Y-AFO2 can efficiently connect multiple enterprise buildings while supporting the protocol operations required for campus networks.
The QFX5120-48Y-AFO2 supports multiple overlay technologies including VXLAN-EVPN for both centrally routed overlay deployments and edge routed bridging overlay architectures. This flexibility allows organizations to implement their own custom overlay network designs with the QFX5120-48Y-AFO2, adapting to specific requirements for virtual networks while maintaining performance.
The QFX5120-48Y-AFO2 includes sophisticated tools for network capacity planning, including telemetry and analytics capabilities that provide visibility into traffic patterns and resource utilization. These insights allow network administrators to optimize QFX5120-48Y-AFO2 deployments and proactively address potential bottlenecks before they impact service delivery.
The QFX5120-48Y-AFO2 incorporates intelligent buffer management technologies including shared buffer architecture, dynamic buffer allocation, and support for Weighted Random Early Detection (WRED). These features enable the QFX5120-48Y-AFO2 to efficiently handle mixed traffic types and prevent congestion, particularly important for environments with varying traffic patterns.
As a carrier-grade switch, the QFX5120-48Y-AFO2 meets stringent telecommunication network equipment standards for reliability, performance, and feature support. The QFX5120-48Y-AFO2 includes redundant components, high-availability features, and protocol support essential in service provider environments, making it suitable for mission-critical infrastructure deployments.
The QFX5120-48Y-AFO2 addresses the needs of modern data centers through its combination of high port density, low latency, and advanced feature set. With support for network virtualization overlay solutions and the ability to efficiently handle dynamic data centers, the QFX5120-48Y-AFO2 enables organizations to build flexible, scalable, and high-performance data center networks that can adapt to evolving requirements.
At Network Republic, our end-user accounts are covered by a 1-Year Warranty on all hardware—whether New, New Open Box, New Pull, Refurbished, or Refurbished by Manufacturer —from the date of delivery. This warranty covers hardware defects under normal use and allows for repair, replacement, or in-house credit at our discretion.
For resellers and wholesale purchases, we offer a 30-Day Warranty limited strictly to functional issues or defects upon arrival, including dead-on-arrival (DOA) items; it does not apply to problems arising after prolonged use. Resellers are responsible for inspecting and testing products within the 30-day window. This warranty excludes accidental damage, misuse, cosmetic wear, third-party modifications, and software-related issues unrelated to hardware failure. Check out our full warranty policy here.
Software licenses are not covered under the standard return and warranty policies and need to be activated on the hardware within 7 days of receipt. Any issues need to be reported immediately, within 10 days, so we can issue an exchange. Under no circumstances will refunds be issued for software licenses.
Our team of professionals are experts in networking hardware configurations and can assist you at any time during your purchasing process. We always recommend great price-performance alternatives based on current market price and availability. In need of assistance or looking for a specific part number? Request a quote today or chat with one of our IT specialists.
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