Juniper QFX5120‑48TAggregation / Edge Routers (PTX)

High‑Density 10 GbE Access with Scalable 40/100GbE Uplink Performance — Juniper QFX5120‑48T

The Juniper QFX5120‑48T is a versatile, high‑performance managed data center switch designed for enterprise spine‑leaf fabrics, campus distribution, and ToR deployments. It offers 48 dual‑speed 1 GbE/10 GbE RJ‑45 copper ports for server access and 6 flexible 40 GbE/100 GbE QSFP28 uplinks for aggregation and backbone connectivity. Running on Juniper Junos OS, the QFX5120‑48T delivers robust Layer 2/3 networking, Virtual Chassis stacking, EVPN‑VXLAN overlay support, and low‑latency switching up to 2.16 Tbps — making it an ideal choice for modern enterprise and data center networks.

Key Features & Highlights

Ports & Connectivity

• 48 × dual‑speed 1 GbE/10 GbE RJ‑45 copper downlink ports — ideal for server and edge device connectivity without optics.

• 6 × dual‑speed 40 GbE (QSFP+)/100 GbE (QSFP28) uplink ports — scalable uplinks for spine or aggregation layers.

• Channelization/Breakout Support: With breakout cables, QSFP28 ports can be split into 4×25 GbE SFP28 or 4×10 GbE SFP+ ports, increasing flexible connection options.

Performance & Capacity

• Switching Capacity: Up to 2.16 Tbps (bidirectional) — suitable for high‑throughput environments.

• Forwarding Performance: Around 1 Bpps (billion packets per second) at wire speed.

• Latency: As low as ≈550–800 ns — excellent for low‑latency fabric architectures.

• MAC Address Table: ~288,000 entries — supports large Layer 2 domains.

• Jumbo Frame Support: Up to 9,216 bytes.

• VLAN Support: Up to 4,093 VLANs for segmentation and traffic control.

Software & Networking Features

• Runs Juniper Junos® OS — industry‑grade OS with automation, scripting, and security features.

• Supports advanced Layer 2 and basic Layer 3 protocols, including OSPF, BGP, RIP, VRRP, static IPv4/v6 routing, and multicast.

• Compatible with EVPN‑VXLAN overlays for flexible data center fabrics and network virtualization.

• Virtual Chassis Technology: Can be stacked with other QFX5120 models to operate as a single logical switch.

Hardware & Physical Specifications

• Form Factor: 1 RU rack‑mount chassis.

• Dimensions: ~1.72″ × 17.36″ × 20.48″ (H × W × D).

• Weight: ~24.25 lb (11 kg).

• CPU & Memory: 2.2 GHz quad‑core Intel CPU with 16 GB memory and 100 GB SSD storage.

• Flexible Airflow: Supports both front‑to‑back and back‑to‑front airflow options for hot‑aisle/cold‑aisle containment.

• Redundant Power: Supports hot‑swappable AC or DC redundant power supplies.

Typical Use Cases

• Data center Top‑of‑Rack (ToR) aggregation with 10 GbE server connectivity.

• Leaf layer in spine‑leaf fabric architectures.

• Campus distribution/core networks needing high throughput.

• EVPN‑VXLAN fabrics and overlay deployments.