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