REFURBISHED
Juniper
Juniper QFX5100-48S-3AFO Refurbished 48-Port 10GbE SFP+ Switch
MPN: QFX5100-48S-3AFO
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Lifetime
Warranty
ISO 9001
Certified Testing
R2v3
Responsible Refurb
25+
Years
5K+
Customers
ISO
Certified
✓
Tested
Every WhaleyComm unit is professionally tested, reset to factory defaults, and certified by our in-house engineers — the same standard trusted by 5,000+ organisations across 25 years. Not a refurb marketplace. A certified lifecycle partner.
Professionally tested to factory specification. Backed by 25+ years of enterprise trust.
This refurbished Juniper QFX5100-48S-3AFO is a compact 1U, Layer 2/Layer 3 data center access switch featuring 48 SFP/SFP+ ports for 10GbE server connectivity and 6 QSFP+ ports for 40GbE uplinks, delivered with dual redundant AC power supplies and a 4-post rail kit included. Every unit is professionally tested and reset to factory defaults under WhaleyComm's ISO 9001-certified process before shipment.Built on Juniper's QFX5100 platform running Junos OS, this switch delivers 1.44 Tbps of aggregate switching capacity and up to 1.08 Bpps forwarding performance with front-to-back airflow suited for hot-aisle/cold-aisle data center deployments. The 6 QSFP+ uplink ports each support breakout mode, allowing the switch to scale to up to 72 total 10GbE ports using QSFP+ splitter cables. The control plane is powered by a 1.5 GHz dual-core Intel CPU with 8 GB of memory and 32 GB SSD storage, supporting advanced features including VXLAN, EVPN, Virtual Chassis, Virtual Chassis Fabric, and Topology-Independent In-Service Software Upgrades (TISSU).
Purchasing refurbished from WhaleyComm delivers enterprise-grade Juniper performance at a significant savings over new list price — without sacrificing reliability. With 5,000+ enterprise customers served over 25+ years and certifications including ISO 9001, R2v3, and e-Stewards, WhaleyComm is the trusted choice for organizations that demand quality and accountability in every unit shipped.
Technical Specifications
MPN
QFX5100-48S-3AFO
Form Factor
1U Rack-Mountable
Layer Support
Layer 2 / Layer 3
10GbE SFP/SFP+ Ports
48
40GbE QSFP+ Uplink Ports
6
Max 10GbE Ports (with breakout)
72
Switching Capacity
1.44 Tbps
Forwarding Rate
1.08 Bpps
Switching Mode
Cut-through and Store-and-Forward
MAC Address Table
288,000 entries
Airflow Direction
Front-to-Back (Ports-to-FRUs)
Power Supply
Redundant AC (Dual)
Management Ports
Dual SFP / RJ-45
CPU
1.5 GHz Dual-Core Intel
Memory
8 GB
Storage
32 GB SSD
Operating System
Junos OS
Dimensions (H x W x D)
1.72 x 17.36 x 20.48 in (4.37 x 44.09 x 52.02 cm)
Weight
21.8 lb (9.9 kg)
Ideal Use Cases
Top-of-Rack Server Access
The QFX5100-48S-3AFO's 48 native 10GbE SFP+ ports make it ideal for high-density top-of-rack deployments, delivering direct 10GbE connectivity to servers with very low 2:1 oversubscription to aggregation.
Spine-and-Leaf Data Center Fabric
As a leaf device in a spine-and-leaf architecture, this switch integrates seamlessly into QFX5100 Virtual Chassis Fabric and supports industry-standard Layer 3 fabric topologies for scalable, low-latency data center designs.
Virtualized and Cloud Environments
With VXLAN and EVPN support, the QFX5100-48S-3AFO provides L2 gateway services for bridging virtualized and bare-metal server workloads, making it well suited for cloud and SDN-driven infrastructure.
Data Center Aggregation Uplinks
The 6 QSFP+ ports deliver up to 40GbE uplink bandwidth per port, and each can be broken out into 4x10GbE connections, giving network architects flexible aggregation options without adding hardware.
Hot-Aisle/Cold-Aisle Cooling Environments
Front-to-back airflow is optimized for hot-aisle/cold-aisle data center cooling configurations, ensuring compatibility with industry-standard physical plant layouts.
Enterprise Network Refresh on a Budget
Organizations upgrading from older switching platforms can gain proven Juniper QFX5100 performance and Junos OS feature depth at a fraction of new hardware cost, backed by WhaleyComm's Lifetime Warranty.
What's Included
Juniper QFX5100-48S-3AFO 48-Port 10GbE Switch
Dual AC Power Supplies (installed)
4-Post Rack Rail Kit
Certificate of Testing
Lifetime Warranty — No Time Limits. No Questions.
Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it. We have stood behind our hardware for 25 years and 5,000+ customers — that is not a marketing line, it is our operating standard.
Compatibility Details
Review supported optics, cables, software, management protocols, and environment-specific compatibility guidance.
COMPATIBLE PLATFORMS
The Juniper QFX5100-48S-3AFO is compatible with the following Juniper platforms and architectures
✓
Virtual Chassis: Interoperable with QFX3500, QFX3600, and other QFX5100 series switches in a Virtual Chassis ring topology (up to 10 members).
✓
EX Series: Compatible with Juniper EX4300 Ethernet Switches in integrated fabric solutions.
SOFTWARE COMPATIBILITY
✓
Virtual Chassis Fabric: Supported as a spine or leaf device in a QFX5100 VCF, and as a leaf device in a QFX5110 VCF (Junos OS 17.3R1 or later required).
✓
Junos Fusion: Supported as a satellite device (Junos OS 14.2.3 or later required).
ADDITIONAL COMPATIBILITY
✓
QFabric System: Compatible as a Node device in QFX3000-G and QFX3000-M QFabric systems.
For compatibility verification specific to your environment, contact our engineering team: +1 214 607-4800 or sales@whaleycomm.com
Shipping & Returns
Clear fulfilment, tracking, return, warranty, and support information for enterprise hardware orders.
Shipping
Orders typically ship within 1-2 business days after payment confirmation. Tracking details are shared once the order has been dispatched.
Returns
Eligible products can be returned according to WhaleyComm's return policy. For DOA, warranty, or product-related issues, contact the support team for replacement or resolution.
Frequently Asked Questions
Product-specific answers about compatibility, testing, warranty, fulfilment, and purchase confidence.
This unit uses front-to-back airflow, meaning air enters at the port side and exits at the power supply and fan side. This configuration is designed for standard hot-aisle/cold-aisle data center deployments where cold air is delivered to the front of the rack.
Yes. Each of the 6 QSFP+ ports can be configured as 4 independent 10GbE interfaces using QSFP+ to SFP+ breakout cables, allowing the switch to support up to 72 total 10GbE ports. This provides significant flexibility when scaling server connectivity without adding switching hardware.
The QFX5100-48S-3AFO ships with Junos OS and a base license. However, certain advanced feature sets — such as MPLS or specific automation capabilities — may require additional software licenses. Contact our engineering team at +1 214 607-4800 or sales@whaleycomm.com to discuss your specific software requirements before purchase.
Yes. Every WhaleyComm unit ships with a Lifetime Warranty. If it fails under normal operating conditions at any point, we replace it at no cost — no time limits, no questions asked.
Every unit goes through our ISO 9001-certified testing process: full power-on diagnostics, port-by-port functionality testing, firmware verification, factory reset, and final inspection. A Certificate of Testing ships with every unit.
Juniper QFX5100-48S-3AFO Refurbished 48-Port 10GbE SFP+ Switch
$549.00
Juniper
Juniper QFX5100-48S-3AFO Refurbished 48-Port 10GbE SFP+ Switch
MPN: QFX5100-48S-3AFO
$549.00
In Stock — Ships Same Day
