Juniper QFX5130 vs QFX5120: Choosing the Right Data Center Switch
The Juniper QFX5130 and QFX5120 are both fixed 1U data center switches built for EVPN-VXLAN spine-and-leaf fabrics, but they target different tiers. The QFX5130 is a 400G, Trident 4-based platform aimed at spine roles and high-bandwidth leaf duty, while the QFX5120 is a proven 100G, Trident 3-based switch optimized for cost-effective 10/25/100GbE leaf and access aggregation. This comparison breaks down throughput, port density, scalability, and procurement so you buy the right tier instead of overspending on ports you will not light.
The short answer
Choose the QFX5130 when you are building or expanding a 400G spine, need 25.6 Tbps of capacity, or want headroom for AI/ML back-end and high-density 100G leaf designs. Choose the QFX5120 when 10/25/100GbE leaf or access aggregation is the job, you want the lowest cost-per-port for a non-blocking fabric, and 400G uplinks are not yet on the roadmap. Most fabrics actually deploy both: QFX5130 spines over QFX5120 (or QFX5130-48C) leaves. Both run Junos with full EVPN-VXLAN and integrate with Apstra and Mist Wired Assurance.
Juniper QFX5130 vs Juniper QFX5120, head to head
Specifications side by side
- Primary role
- 400G spine / high-density 100G leaf
- 10/25/100G leaf / access aggregation
- ASIC
- Broadcom Trident 4
- Broadcom Trident 3
- Form factor
- 1U fixed
- 1U fixed
- Flagship model
- QFX5130-32CD (32x 400GbE QSFP-DD)
- QFX5120-48Y (48x 25GbE + 8x 100GbE)
- Switching capacity
- Up to 25.6 Tbps (32CD); 16 Tbps (48C)
- Up to 6.4 Tbps (32C); 2.56 Tbps (48Y)
- Max 100G density
- 128x 100/25/10G via breakout (32CD)
- 32x 100G (32C) or 8x 100G uplinks (48Y)
- Highest port speed
- 400GbE
- 100GbE
- Operating system
- Junos OS / Junos OS Evolved
- Junos OS
- Fabric / overlay
- EVPN-VXLAN, IP fabric, Apstra-managed
- EVPN-VXLAN, IP fabric, Apstra-managed
- Latency
- Low-latency cut-through (sub-microsecond class)
- As low as ~550 ns (series)
- Power / cooling
- Redundant PSUs, AFO/AFI airflow options
- Redundant PSUs, AFO/AFI airflow options
- MACsec
- Supported on select ports/SKUs
- Supported on select ports/SKUs
Where Juniper QFX5130 wins
- Native 400GbE with 25.6 Tbps capacity for spine roles and AI/ML back-end fabrics
- Trident 4 silicon delivers deeper tables and headroom for large EVPN-VXLAN deployments
- Up to 128x 100/25/10G via breakout for very high leaf density in 1U
- Junos OS Evolved option and Apstra intent-based automation for fabric scale
- Future-proofs the design as 100G servers and 400G uplinks become standard
Where Juniper QFX5120 wins
- Lower acquisition cost and best $/port for 10/25/100G leaf and access
- Field-proven, long-shipping platform with broad deployment history
- Sub-microsecond latency and rich Junos L2/L3 + EVPN-VXLAN feature set
- Right-sized 48x25G + 8x100G layout matches typical server racks
- Mature optics ecosystem keeps cabling and transceiver costs predictable
Which one should you buy?
Building a new 400G spine for a growing EVPN-VXLAN fabric
Pick Juniper QFX5130. The QFX5130-32CD provides 32 native 400GbE ports and 25.6 Tbps, the right tier to aggregate many leaves without becoming a bottleneck.
Top-of-rack leaf for racks of 10/25GbE servers with 100G uplinks
Pick Juniper QFX5120. The QFX5120-48Y's 48x25G plus 8x100G layout matches standard server racks at the lowest cost-per-port for non-AI workloads.
AI/ML or HPC back-end cluster needing high-bandwidth, low-latency switching
Pick Juniper QFX5130. 400G ports and Trident 4 capacity support the east-west bandwidth and lossless designs these clusters demand.
Refreshing access aggregation where 400G is not on the near-term roadmap
Pick Juniper QFX5120. It delivers proven EVPN-VXLAN leaf capability without paying for 400G ports you will not use for several refresh cycles.
Standardizing a two-tier fabric with mixed spine and leaf tiers
Pick Juniper QFX5130. Deploy QFX5130 as spine and pair with QFX5120 (or QFX5130-48C) leaves for a clean, scalable spine-and-leaf topology.
Frequently asked
What is the main difference between the Juniper QFX5130 and QFX5120?
The QFX5130 is a 400G, Trident 4-based switch built for spine roles and high-density 100G leaf duty, with up to 25.6 Tbps of capacity. The QFX5120 is a 100G, Trident 3-based switch optimized for cost-effective 10/25/100GbE leaf and access aggregation. The QFX5130 offers more bandwidth and higher port speeds; the QFX5120 offers a lower cost-per-port for non-400G fabrics.
Is the QFX5130 a spine or a leaf switch?
The QFX5130-32CD is primarily positioned as a 400G spine and can also serve as a high-density 100G leaf using breakout cables. The QFX5130-48C variant, with 48x 100GbE in SFP56-DD, is well suited to top-of-rack leaf roles. Both can be deployed in either position depending on the fabric design.
Do both switches support EVPN-VXLAN?
Yes. Both the QFX5130 and QFX5120 run Junos and support standards-based EVPN-VXLAN for IP fabrics, micro/macro-segmentation, and overlay networking. Both also integrate with Juniper Apstra for intent-based fabric automation and with Mist Wired Assurance for AIOps-driven operations.
How do the QFX5130 and QFX5120 differ in switching capacity?
The QFX5130-32CD delivers up to 25.6 Tbps and the QFX5130-48C delivers 16 Tbps. The QFX5120-32C reaches 6.4 Tbps and the QFX5120-48Y is 2.56 Tbps non-blocking. If your fabric needs to aggregate large amounts of 100G or move to 400G, the QFX5130 has the headroom; for 25/100G leaf duty the QFX5120 is sufficient and more economical.
Which switch is better for an AI or HPC back-end network?
The QFX5130 is the better fit because its 400GbE ports and Trident 4 silicon support the high east-west bandwidth and low-latency, lossless designs that GPU clusters and HPC fabrics require. The QFX5120 remains a strong choice for general-purpose data center leaf and campus aggregation rather than AI back-end.
Can I mix the QFX5130 and QFX5120 in the same fabric?
Yes, and many designs do. A common topology uses QFX5130 switches as 400G spines with QFX5120 (or QFX5130-48C) switches as leaves. Because both run Junos with the same EVPN-VXLAN feature set and Apstra automation, mixing tiers is straightforward and lets you right-size cost at each layer.
Are the QFX5130 and QFX5120 TAA compliant and available on GSA or SAP/FAR channels?
As an authorized HPE Juniper Networking reseller, we can source both the QFX5130 and QFX5120 with the appropriate contract vehicles in mind, including GSA MAS (application in progress) and SAP/FAR channels, and confirm TAA considerations for your specific configuration. Tell us your agency or program and we will quote the compliant SKUs and optics.
Should I buy the QFX5120 now or move straight to the QFX5130?
If your servers are 10/25GbE and your uplinks top out at 100G, the QFX5120 delivers the lowest cost-per-port and is field-proven. If you are deploying 100G servers, planning 400G uplinks, or building an AI/ML or large EVPN-VXLAN fabric, the QFX5130 future-proofs the design and avoids a near-term re-spine.
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