Juniper QFX5120‑48YUncategorized

High‑Density 25/100GbE Leaf & Fabric Switch — Juniper QFX5120‑48Y.

The Juniper QFX5120‑48Y delivers powerful, scalable performance for modern data centers and campus networks. It supports 48 flexible SFP/SFP+/SFP28 ports capable of 1 GbE, 10 GbE, and 25 GbE speeds, along with 8 QSFP+/QSFP28 uplinks configurable at 40 GbE or 100 GbE. Powered by Juniper Junos OS, this switch offers advanced Layer 2/Layer 3 routing, EVPN‑VXLAN overlays, low latency, and high throughput up to 4 Tbps — ideal for top‑of‑rack and spine‑leaf architectures. Redundant power and airflow options ensure reliable operation in demanding environments.

Key Features & Specs

Port & Connectivity

• 48 × SFP/SFP+/SFP28 Ports — support 1 GbE, 10 GbE, or 25 GbE speeds depending on connected optics.

• 8 × QSFP+/QSFP28 Uplink Ports — each can be used as 40 GbE or 100 GbE (via breakout and transceivers).

• Management Ports: Dual RJ‑45 management.

• Breakout Support: With breakout cables, QSFP28 uplinks can be channelized into multiple lower‑speed ports for flexible connectivity.

Performance

• Switching Capacity: ~4 Tbps bidirectional, enabling high throughput for leaf & aggregation layers.

• Forwarding Rate: ~2 Bpps (billion packets per second).

• MAC Address Table: ~288,000 entries.

• VLANs Supported: Up to 4,093 VLANs.

• Jumbo Frames: Up to 9,216 bytes.

• Low Latency: ~800 ns typical at wire speed.

Software & Networking Features

• Runs Juniper Junos OS — enterprise‑grade software with rich Layer 2 and Layer 3 support.

• Supports routing protocols such as OSPF, BGP, RIP, VRRP and multicast.

• Compatible with EVPN‑VXLAN, enabling modern overlay/underlay fabric architectures.

• Automation tools and orchestration support including APIs, scripting, and ZTP (zero‑touch provisioning).

Hardware & Physical

• Form Factor: 1 U rack‑mount switch.

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

• Weight: ~23.7 lb (10.75 kg).

• Power Consumption: ~272 W max, ~247 W typical.

• Airflow: Front‑to‑back or back‑to‑front (deployment flexibility).

• Redundant Fans & PSUs: Supports hot‑swappable modules for high availability.

Use Cases

• Data Center Leaf & Spine Fabrics with 25 GbE downlinks and 40/100 GbE uplinks.

• Top of Rack (ToR) Aggregation for high‑throughput server racks.

• Campus Core & Distribution for enterprise networks needing scalable fabrics.

• EVPN‑VXLAN Overlay Networks and scalable multi‑tenant clouds.