What is the port configuration and throughput of QFX5120-48Y-AFI2?

Features 48x 1/10/25GbE SFP28 downlink ports and 8x 40/100GbE QSFP28 uplinks, delivering 4 Tbps bidirectional Layer 2/3 performance at 2 Bpps forwarding rate. Breakout cables enable up to 80x 25GbE ports, ideal for dense server access in non-blocking fabrics.

What airflow and power options does it support?

AFI2 model has front-to-back airflow for hot aisle deployments, with redundant AC power supplies (max 283W draw, typical 155W). Includes five redundant fan modules labeled AIR IN, ensuring reliability in 24/7 data center operations.

What management and security features are included?

Runs Junos OS with Zero Touch Provisioning, role-based CLI, SNMPv3, sFlow, and EASE tools. Security via MACsec, hardware IPsec, Layer 2-4 filtering, supporting secure high-speed data center interconnects.

Is it suitable for spine-leaf architectures?

Yes, low 800ns latency and 4Tbps capacity make it perfect for leaf/spine topologies. Broadcom Trident3 chip enables wire-speed L2/L3 with EVPN-VXLAN, scaling to thousands of 25GbE endpoints in cloud data centers.

What are the environmental operating specs?

Operates 0-40°C, 10-90% humidity non-condensing. Storage -40-70°C. 1U rack form factor with front-to-back cooling optimizes for standard data center environments with high port density.

Does it support multicast and virtualization?

Supports IPv4/IPv6 unicast/multicast up to 52K routes, MSTP (64 instances), and VXLAN for overlays. Virtual Chassis enables stacking for simplified management in large-scale deployments.

QFX5120-48Y-AFI2 - Juniper QFX5120-48Y-AFI2 4Tbps 48x25G+8x100G Switch

Name: Juniper QFX5120-48Y-AFI2 4Tbps 48x25G+8x100G Switch
Brand: Juniper
SKU: QFX5120-48Y-AFI2
Price: 16112 USD
Availability: InStock

QFX5120-48Y-AFI2 - Juniper QFX5120-48Y-AFI2 4Tbps 48x25G+8x100G Switch | US IT Hardware

Product overview

The Juniper QFX5120-48Y-AFI2 is a versatile, high-density 1U Ethernet switch optimized for data center leaf and spine, campus distribution, and enterprise edge deployments. It features 48 dual-rate 1/10/25GbE SFP28 downlink ports and 8 40/100GbE QSFP28 uplink ports, delivering up to 4 Tbps bidirectional Layer 2/Layer 3 performance with forwarding rates of 2 Bpps and latency as low as 800 nanoseconds. Powered by Broadcom Trident3 switch chip, it supports breakout cabling to expand to 80x 25GbE ports. Equipped with a 2.2 GHz quad-core Intel CPU, 16 GB DRAM, and 64 GB SSD, it runs Junos OS with advanced automation, Zero Touch Provisioning, and EVPN-VXLAN for cloud-scale networking. Redundant AC power supplies and fan modules ensure high availability, with front-to-back airflow (AFI2 variant) for hot aisle cooling. Security includes MACsec and Layer 2-4 filtering. Ideal for high-performance computing, AI/ML fabrics, and 5G backhaul requiring ultra-low latency and wire-speed multicast routing.

4 Tbps bidirectional switching capacity with 2 Bpps forwarding.
48x 25GbE SFP28 ports plus 8x 100GbE QSFP28 uplinks.
Latency as low as 800 nanoseconds across all ports.
Breakout support expands to 80x 25GbE ports total.
Redundant power supplies and fans for high availability.
Junos OS with EVPN-VXLAN and Zero Touch Provisioning.

Expedited and overnight shipping options are available at checkout, priced by destination and service.
Purchase orders accepted from qualified institutions.
Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

Manufacturer part #	QFX5120-48Y-AFI2
Brand	Juniper
Condition	Refurbished
OS	Junos OS Base (Upgradeable)
Model	QFX5120-48Y-AFI2
Switch Chip	Broadcom Trident3
Product Line	QFX Series
Product Type	Networking Switch
Virtual Chassis	Yes

Storage

Storage

Compatible systems

Optimized for Juniper QFX ecosystems with broad transceiver support and Junos interoperability.

Juniper QFX Series
Model: QFX5120
Form factor: 1U Rack
Generation: Current
Native integration within QFX fabrics.

Best for

Data Center Leaf
Top-of-rack access for 25GbE server connectivity with 100GbE uplinks to spine.
Data Center Spine
High-density aggregation using breakout to 80x25GbE for east-west traffic.
Campus Distribution
10/25GbE downlinks to access switches with 100GbE to core routers.
HPC Clusters
Low-latency 800ns fabric for high-performance computing and AI training.
Cloud Networking
EVPN-VXLAN overlays for multi-tenant virtualized environments.
Enterprise Edge
Secure aggregation with MACsec for branch-to-DC connectivity.

Details

Shipping, warranty & returns

Customer reviews

No reviews yet — be the first to review this part.

Latency	<800 ns
Jumbo Frames	9216 bytes
Forwarding Rate	2 Bpps
Switching Capacity	4 Tbps bidirectional / 2 Tbps unidirectional

Fans	5x Redundant Fan Modules
Airflow	Front-to-Back (Airflow In)
Operating Temp	0° to 40°C

Ports Uplink	8 x 40/100GbE QSFP28
Ports Downlink	48 x 1/10/25GbE SFP28
Management Ports	2x RJ-45, Console, USB

Juniper QFX5120-48Y-AFI2 4Tbps 48x25G+8x100G Switch

Product overview

Featuring

Storage

Compatible systems

Best for

Details

Shipping, warranty & returns

Customer reviews

Processor

Network & Communication

Security

Power Consumption

Physical Characteristics

Environmental

Interface/Ports

Frequently asked questions