NVIDIA Spectrum SN3420 MSN3420-CB2FC – 48-Port 25GbE & 12-Port 100GbE Top-of-Rack Switch with Cumulus Linux

The NVIDIA Spectrum® SN3420 (model MSN3420-CB2FC) is a high-performance 1U top-of-rack switch engineered for data centers evolving from 10G to 25G server access while maintaining 100GbE uplink readiness. Built on the second-generation Spectrum-2 ASIC, it offers 48 x SFP28 ports supporting 10/25GbE and 12 x QSFP28 ports supporting 40/100GbE. With cut-through switching, advanced telemetry (What Just Happened®), and a fully shared packet buffer, the SN3420 ensures predictable low latency and no head-of-line blocking. The switch comes factory-preloaded with NVIDIA Cumulus Linux, enabling web-scale automation, Linux-native tooling, and robust Layer-2/Layer-3 routing. Whether you are building a leaf/spine fabric, hyperconverged infrastructure, or high-frequency trading environment, the MSN3420-CB2FC delivers performance, flexibility, and open programmability.

The SN3420 is powered by the Spectrum-2 ASIC (6.4Tb/s switching capacity), providing groundbreaking programmability and visibility. The fully shared packet buffer architecture eliminates artificial per-port buffering limits, ensuring fairness under incast traffic. Spectrum-2 also supports deep packet inspection up to 512 bytes, programmable pipeline, and advanced RoCE transport for RDMA over Converged Ethernet — essential for AI, ML, and NVMe over Fabrics. Open Ethernet breaks vendor lock-in, allowing choice of operating systems. The MSN3420-CB2FC comes with Cumulus Linux, but the platform also supports SONiC, DENT (Linux Switchdev), or ONIE for bare-metal installations. This ensures long-term flexibility and alignment with open networking principles.

The MSN3420-CB2FC interoperates seamlessly with NVIDIA ConnectX® network adapters (25GbE/100GbE), LinkX® copper/fiber cables, and any standards-based Ethernet equipment. It supports a wide range of transceivers: 25GbE SFP28 SR/LR/AOC/DAC, 100GbE QSFP28 SR4/LR4/ER/CWDM4, and breakout cables (100GbE to 4x25GbE). Cumulus Linux ensures compatibility with major automation frameworks, routing stacks (FRR, Bird), and orchestration tools (Kubernetes CNI, OpenStack). For a fully supported solution, combine with NVIDIA Cumulus NetQ for real-time network operations, visibility, and lifecycle management.

Hong Kong Starsurge offers a complete customer lifecycle: pre-sales consulting, configuration assistance, and post-sales technical support. The NVIDIA SN3000 series comes with a 1-year limited hardware warranty (return-and-repair, 14 business day turnaround). Upgraded support plans — including next-business-day on-site replacement and 4-hour technician dispatch — are available upon request. Starsurge also provides remote or on-site installation, configuration, and network monitoring services tailored to your data center needs.

Hong Kong Starsurge Group Co., Limited is a technology-driven provider of network hardware, IT services, and system integration since 2008. Serving government, healthcare, manufacturing, finance, education, and enterprise clients worldwide. We deliver switches, NICs, wireless solutions, IoT systems, and custom software with multilingual support and global delivery. With a customer-first approach, Starsurge ensures reliable quality, responsive service, and tailored network infrastructure solutions.

• Airflow direction (P2C for MSN3420-CB2FC) matches your data center aisle layout.
• Power supply type (AC or DC) — standard AC included. Please confirm voltage.
• Transceiver types and cable lengths for server/spine connectivity.
• Warranty upgrade options (Next Business Day or 4-hour onsite).
• Software feature license requirements (Cumulus Linux full L3 features included).