REFURBISHED
Juniper
Juniper QFX5100-48S-AFO/AFI Refurbished — 48x10GbE SFP+ 6x40GbE Switch
MPN: QFX5100‑48S‑AFO
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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. Lifetime guaranteed. Enterprise-grade switching at a fraction of new cost.
This refurbished Juniper QFX5100-48S is professionally tested and reset to factory defaults, delivering the same performance as new hardware at a significantly lower cost. Available in both AFO (Front-to-Back) and AFI (Back-to-Front) airflow variants, this 1U data center switch provides 48 x 1/10GbE SFP+ access ports and 6 x 40GbE QSFP+ uplink ports, making it one of the most versatile top-of-rack platforms in the QFX5100 series.The QFX5100-48S is engineered for demanding enterprise and cloud data center environments. The six QSFP+ uplinks support native 40GbE connections or breakout into 4x10GbE per port, enabling flexible spine-leaf fabric designs. Running Junos OS, the platform supports a full suite of routing and overlay protocols including OSPF, BGP, IS-IS, EVPN-VXLAN, and MPLS, alongside MACsec encryption for secure interconnects. Automation and programmability are built in through NETCONF, RESTCONF, gRPC, and streaming telemetry.
WhaleyComm has served 5,000+ enterprise customers over 25+ years and holds ISO 9001, R2v3, e-Stewards, and UNEDA certifications. Every unit ships with a Lifetime Warranty. At $599, this is an exceptional value for a proven data center switching platform that lists well above this price point when purchased new.
Technical Specifications
Access Ports
48 x 1/10GbE SFP+
Uplink Ports
6 x 40GbE QSFP+
QSFP+ Breakout
4x10GbE per port
Airflow (AFO)
Front-to-Back (hot aisle)
Airflow (AFI)
Back-to-Front (cold aisle)
Operating System
Junos OS
Layer 2 Protocols
EVPN, VXLAN
Layer 3 Protocols
OSPF, BGP, IS-IS, MPLS
Security
MACsec encryption
Management
NETCONF, RESTCONF, gRPC, streaming telemetry
Form Factor
1U rack-mount
Ideal Use Cases
Top-of-Rack Server Access
With 48 x 10GbE SFP+ ports, the QFX5100-48S connects high-density server and storage populations at the rack level with low latency and wire-speed performance.
Spine-Leaf Fabric Aggregation
The six 40GbE QSFP+ uplinks with 4x10GbE breakout capability make this switch an ideal leaf node in modern spine-leaf architectures, scaling fabric bandwidth efficiently.
EVPN-VXLAN Overlay Deployments
Native support for EVPN-VXLAN overlays enables cloud-style network virtualization, making this switch well-suited for private cloud and multi-tenant data center environments.
Mixed Hot/Cold Aisle Raised-Floor Data Centers
The availability of both AFO and AFI airflow variants allows precise thermal alignment with existing rack cooling infrastructure, eliminating airflow conflicts.
Enterprise Campus Core or Distribution
Full Layer 3 support including BGP, OSPF, IS-IS, and MPLS enables deployment as a high-performance campus core or distribution switch for fiber-connected environments.
Network Automation and Telemetry Initiatives
Built-in support for NETCONF, RESTCONF, gRPC, and streaming telemetry makes the QFX5100-48S a strong fit for teams modernizing operations with infrastructure-as-code tooling.
What's Included
Juniper QFX5100-48S 48-Port 10GbE SFP+ Data Center Switch (AFI or AFO as selected)
Rack-mount kit and mounting hardware
Hot-swappable fan modules (model dependent)
Redundant hot-swappable power supplies
Console cable (RJ-45 to USB/DB-9)
Power cord
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 OPTICS & CABLES
✓
The QFX5100-48S is compatible with standard SFP+ transceivers for 1GbE and 10GbE connections and standard QSFP+ transceivers for 40GbE or 4x10GbE breakout configurations.
SOFTWARE COMPATIBILITY
✓
The switch runs Junos OS and is compatible with Juniper's spine-leaf fabric architectures alongside other QFX-series platforms.
ADDITIONAL COMPATIBILITY
✓
It integrates with Juniper QFX5100-series accessories including compatible hot-swappable fan modules and redundant power supplies.
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.
The AFO (Airflow Out) model moves air from Front-to-Back, exhausting out the rear of the chassis — designed for hot-aisle containment. The AFI (Airflow In) model moves air from Back-to-Front, exhausting out the front — designed for cold-aisle containment. Both models are otherwise identical in port configuration and performance.
Yes. Each of the six QSFP+ ports supports breakout into 4x10GbE, providing up to 24 additional 10GbE connections. This flexibility allows the switch to serve both as a high-density access layer device and as a fabric interconnect node.
Yes. The QFX5100-48S runs Junos OS and supports EVPN-VXLAN overlays natively, making it compatible with modern cloud and multi-tenant data center fabric designs. It also supports MPLS, BGP, OSPF, and IS-IS for full Layer 2 and Layer 3 flexibility.
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-AFO/AFI Refurbished — 48x10GbE SFP+ 6x40GbE Switch
$799.00
Juniper
Juniper QFX5100-48S-AFO/AFI Refurbished — 48x10GbE SFP+ 6x40GbE Switch
MPN: QFX5100‑48S‑AFO
$799.00
In Stock — Ships Same Day
