The Juniper QFX5120‑32C is a high‑performance data center leaf‑and‑spine switch designed for modern networking architectures such as spine‑leaf fabrics and campus distribution. It belongs to the Juniper QFX5120 Series — a family of low‑latency, high‑throughput switches running Juniper Junos OS, with advanced Layer 2 and Layer 3 features.
Key Features
Ports & Connectivity
32 × QSFP28 ports (100 GbE) or 32 × QSFP+ ports (40 GbE) — high‑density uplinks for data center spine or leaf layers.
2 × 10 GbE SFP+ ports — additional connectivity for management or network edge interfaces.
Breakout Flexibility
Using breakout cables, the QSFP28 ports can be channelized into:
4 × 25 GbE (SFP28) interfaces per QSFP28, and
4 × 10 GbE (SFP+) interfaces per QSFP+ port — allowing flexible top‑of‑rack (ToR) connectivity options.
Performance & Scaling
Switching Capacity: Up to 6.4 Tbps (bidirectional) — ensures high wire‑speed performance.
Latency as low as ~550–800 ns — suitable for latency‑sensitive applications.
Large MAC address table (~288,000 entries) and high routing scale (IPv4/IPv6 prefixes) supported on variants.
Layer 2 / Layer 3 & Software Support
Runs Juniper Junos OS with advanced capabilities including EVPN‑VXLAN, MPLS, BGP, OSPF, L3 VPNs, automation, telemetry & intent‑based management.
Supports zero‑touch provisioning (ZTP), Ansible, Python, and comprehensive automation frameworks.
Enterprise & Data Center Features
Flexible airflow options (front‑to‑back or back‑to‑front) and redundant, hot‑swappable power supplies and fans for reliable data center operation.
Can be deployed as spine or leaf in large scale spine‑leaf fabrics.
Typical Use Cases
100 GbE / 40 GbE data center leaf and spine fabrics
Top of Rack (ToR) aggregation for high‑speed server connectivity
Campus distribution/core switching
Virtualized and cloud networking with EVPN‑VXLAN overlays
Automated Day 0‑Day 2 network deployment
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