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Juniper

Juniper QFX5120-48Y-D-AFI2 | QFX5120 48-Port 25G Switch, 8x 100G, DC Back-to-Front

QFX5120-48Y-D-AFI2

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Description

The Juniper QFX5120-48Y-D-AFI2 is a high-performance 1U data center switch designed for 25GbE server access and 100GbE uplinks in leaf-spine architectures. With 48 SFP28 ports supporting 1G/10G/25G speeds and 8 QSFP28 uplinks for 40G/100G connectivity, it delivers 4 Tbps switching capacity and sub-microsecond latency. The DC-powered AFI2 variant features back-to-front airflow with redundant power supplies and fans, ideal for structured data center deployments requiring precise thermal management.

Features

Broadcom Trident 3 chipset for hardware-accelerated packet forwarding
- Full Layer 2/Layer 3 switching and routing capabilities
- EVPN-VXLAN overlay support for modern data center fabrics
- Virtual Chassis technology (up to 4 switches)
- Advanced routing protocols: BGP, OSPF, IS-IS, RIP
- MPLS and Layer 3 VPN support
- IPv6 Provider Edge (6PE) capabilities
- Hardware-based QoS and ACL processing
- Zero Touch Provisioning (ZTP) for automated deployment
- Juniper Telemetry Interface (JTI) for real-time monitoring
- gRPC, OpenConfig, and sFlow telemetry streaming
- Automation support: Ansible, Python, REST APIs
- Redundant hot-swappable DC power supplies and fans
- Low-latency design optimized for east-west data center traffic

Warranty

All products sold by XS Network Tech include a 12-month warranty on both new and used items. Our in-house technical team thoroughly tests used hardware prior to sale to ensure enterprise-grade reliability.

All technical data should be verified on the manufacturer data sheets.

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Technical Specifications

FAQs

Technical Specifications

48x 25GbE SFP28 ports (1G/10G/25G capable)
- 8x 100GbE QSFP28 uplink ports (40G/100G capable)
- Switching capacity: 4 Tbps
- Forwarding rate: 2 Bpps
- MAC address table: 288,000 entries
- Latency: 550 nanoseconds
- Form factor: 1U rack-mountable
- Airflow: Back-to-front (AFI2)
- Power: Redundant DC power supplies
- Memory: 16GB
- Routing table: 128,000 IPv4/IPv6 routes
- Management: CLI, NETCONF, REST API, SNMP

FAQs

Q: What port speeds does the QFX5120-48Y-D-AFI2 support?
A: The 48 SFP28 downlink ports support 1GbE, 10GbE, and 25GbE speeds. The 8 QSFP28 uplink ports support 40GbE and 100GbE. Using breakout cables, each 100GbE QSFP28 port can be broken into four 25GbE SFP28 ports, expanding total 25GbE capacity to 80 ports.

Q: What is the airflow direction on this model?
A: The AFI2 suffix indicates back-to-front airflow (also called port-side intake), meaning air is drawn in from the port side and exhausted at the rear. This is designed for cold-aisle containment where cool air enters from the front and hot air exhausts to the back.

Q: What are typical deployment scenarios for the QFX5120-48Y?
A: The QFX5120-48Y is ideal for leaf-spine data center fabrics, campus distribution layer, or top-of-rack deployments. It supports EVPN-VXLAN overlays for modern virtualized data centers and collapsed spine architectures for medium-scale environments.

Q: Does this switch support Layer 3 routing?
A: Yes, the QFX5120-48Y offers full Layer 3 capabilities including OSPF, BGP, MPLS, and IPv6. It can function as an edge-routed gateway and supports advanced features like EVPN, BGP Additional Paths, and Layer 3 VPN.

Q: Can the QFX5120-48Y be used in a Virtual Chassis configuration?
A: Yes, the QFX5120 supports Juniper Virtual Chassis technology, allowing up to four interconnected switches to operate as a single logical device with one IP address, eliminating the need for Spanning Tree Protocol.

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