NVIDIA Mellanox MSN3800-CS2FC Spectrum-2 64-Port QSFP28 100GbE Open Ethernet Switch with Cumulus Linux - MSN3800-CS2FC
This open Ethernet switch is the NVIDIA Mellanox MSN3800-CS2FC (NVIDIA P/N: 920-9N210-00F7-0C0), a Spectrum-2 based 2U switch with 64 QSFP28 ports operating at up to 100 Gb/s per port, running Cumulus Linux, with P2C (Power-to-Connector) airflow and dual redundant AC power supplies. This is a refurbished, tested unit from T.E.S IT-SOLUTIONS. It is NOT an InfiniBand switch. This is the Cumulus Linux variant — for Onyx OS, the MSN3800-CS2R is the corresponding model.
Engineering Context
The MSN3800-CS2FC is built on the NVIDIA Spectrum-2 switching ASIC, delivering deterministic low latency, zero packet loss, deep buffers, and advanced telemetry across all 64 QSFP28 ports. Each port supports up to 100GbE (also configurable as 4x25GbE or 2x50GbE via breakout cables). The switch provides up to 12.8 Tb/s aggregate switching capacity. The x86 control processor runs Cumulus Linux, enabling fully open networking with FRR routing (BGP, OSPF), EVPN/VXLAN, automation via Ansible/Salt/Puppet, and Linux-native monitoring and management tools.
Deployment and Use Cases
The MSN3800-CS2FC is deployed as a spine or aggregation switch in open networking leaf-spine fabrics for hyperscale cloud, AI/ML GPU clusters, HPC environments, and enterprise data center cores. Common deployments include spine layer in BGP/EVPN-VXLAN Clos fabrics managed through automation frameworks, 100GbE aggregation for RoCEv2 NVMe-oF storage networks, east-west traffic switching for AI training clusters with GPUDirect RDMA, and multi-tenant cloud infrastructure with VXLAN overlay isolation.
Technical Specifications
Model: MSN3800-CS2FC
NVIDIA P/N: 920-9N210-00F7-0C0
ASIC: NVIDIA Spectrum-2
Ports: 64x QSFP28 (100GbE per port)
Aggregate Bandwidth: Up to 12.8 Tb/s
Operating System: Cumulus Linux
CPU: x86 Control Processor
Airflow: P2C (Power-to-Connector)
Power Supply: Dual Redundant AC, Hot-Swappable
Form Factor: 2U Standard Rackmount
Condition: Refurbished
Compatibility and Hard Constraints
The MSN3800-CS2FC uses QSFP28 ports compatible with QSFP28 DAC, AOC, and transceiver modules at 100GbE, 50GbE (2x breakout), and 25GbE (4x breakout). It is NOT compatible with QSFP56 or QSFP-DD optics — for 200GbE or 400GbE, Spectrum-3 or Spectrum-4 platforms are required. This model runs Cumulus Linux; for Onyx OS, the MSN3800-CS2R is available. The P2C airflow direction must match the rack cooling layout — for C2P airflow, a different SKU variant is required. Cumulus Linux licensing terms should be verified with NVIDIA for ongoing support and updates.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS provides this MSN3800-CS2FC as a refurbished unit, lab-tested with verified PSU redundancy, thermal stability, and 100GbE port performance across all 64 ports. Technical consultation is available for fabric architecture, Cumulus Linux configuration guidance, and optics compatibility. Global shipping with 1-3 business day handling time.