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Silver 1U rack-mount network switch with front-to-back airflow, 48 SFP28 and 8 QSFP28 ports

HPE Juniper Networking

HPE Juniper Networking QFX5120-48Y-AFO2 network switch 48x25G 8x100G front-to-back airflow

SKU CH-HXZ6-52VN4

A managed 48-port switch with 25GbE SFP28 downlinks and eight 100GbE QSFP28 uplinks, front-to-back airflow for rack mounting

  • Key features• 48 25GbE (SFP28)/10GbE (SFP+)/1GbE (SFP) downlink ports •
  • 48 SFP28 ports handle 1, 10 and 25 GbE server links
  • Eight QSFP28 uplinks provide 40 or 100 GbE spine connectivity
  • Front-to-back airflow matches standard cold-aisle rack layouts
  • Up to 4 Tbps bidirectional throughput with 800 ns latency
  • Managed Layer 3 switching supports EVPN-VXLAN data-center fabrics

High-density 25G/100G switch

The Juniper QFX5120-48Y-AFO2 is a managed Layer 3 switch built for data centre top-of-rack and campus distribution roles. It provides 48 ports supporting 1, 10 or 25 Gigabit SFP28 connections plus eight 40 or 100 Gigabit QSFP28 uplinks. Front-to-back airflow matches standard rack cooling layouts.

Suited for spine-leaf and overlay fabrics

Teams deploying EVPN-VXLAN overlays or high-scale spine-and-leaf architectures will use the low-latency switching fabric and L3 gateway features. Buyers needing copper downlinks or higher 100G port density should evaluate other models. The 2.2 GHz quad-core processor and 800 nanosecond latency support demanding virtualised workloads.

48 SFP28 downlinks with 8 QSFP28 uplinks

The decisive specification is the 48-port 25G SFP28 downlink count combined with eight 100G QSFP28 uplinks. This exact port mix determines whether the switch fits a given leaf or aggregation layer design.

How it compares

Measured against everything we stock in Ethernet & PoE Switches, at today’s prices. Recalculated every night.

Price $4,885.99
Pricier than about 90% of the 2,759 comparable items (median $482.99).

Specifications

Product
Brand nameJuniper
Product lineQFX5120-48Y
Model nameQFX5120-48Y-AFO2

Questions about this item

Which SFP28 or SFP+ transceivers do I need to populate the 48 downlink ports?

The 48 downlink ports accept 25 Gigabit SFP28, 10 Gigabit SFP+, or 1 Gigabit SFP modules, so you must supply the matching transceivers and cables for each link.

Can the eight 100 Gigabit QSFP28 uplink ports also run at 40 Gigabit with my existing QSFP+ optics?

Yes, each of the eight uplink ports supports both 100 Gigabit QSFP28 and 40 Gigabit QSFP+ modules, allowing reuse of older 40 Gigabit optics.

How can I verify the switch is delivering the advertised sub-microsecond latency after installation?

Use the built-in telemetry and latency-monitoring commands in Junos OS to measure port-to-port delay; values around 800 nanoseconds confirm the hardware is operating as specified.

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