NVIDIA Mellanox MSN3800-CS2F Spectrum-2 100GbE Open Ethernet Switch — MPN MSN3800-CS2F (NVIDIA P/N 920-9N210-00F7-0X1): This is a 2U fixed-configuration Open Ethernet switch built on the NVIDIA Spectrum-2 ASIC, providing 64 QSFP28 ports each capable of 100GbE. The MSN3800-CS2F is a P2C (Power-to-Connector) airflow variant intended for racks where cold air enters from the PSU side. This is the Onyx-managed SKU — it ships with Mellanox Onyx OS pre-installed and supports L2/L3 routing, EVPN/VXLAN, automation, and streaming telemetry out of the box. This is NOT a 200GbE QSFP56 switch and IS NOT a 400GbE QSFP-DD switch. This is a refurbished unit.
Engineering Context
The MSN3800-CS2F is built around the NVIDIA Spectrum-2 silicon, which provides line-rate L2/L3 forwarding, deep packet buffers, programmable telemetry, and hardware support for RoCEv2 and adaptive routing at 100GbE. Each of the 64 QSFP28 ports runs at 100GbE (4x25G NRZ) for an aggregate switch capacity of 6.4 Tb/s. The 2U chassis houses dual hot-swappable redundant AC PSUs, multiple hot-swappable fan modules, and an x86 management CPU running Onyx. P2C airflow draws cold air from the PSU/fan rear face and exhausts hot air at the port-side front face, which is suited to racks designed for reverse airflow.
Deployment & Use Cases
Spine and aggregation layers in 100GbE leaf-spine fabrics. Top-of-rack switching for dense compute racks with ConnectX-5 and ConnectX-6 100GbE NICs. RoCEv2 storage backbones for NVMe-oF over Ethernet. East-west cloud traffic aggregation in enterprise and service provider data centers. EVPN/VXLAN overlay fabrics with Onyx control plane. Hyperscale racks designed for reverse airflow. Storage networks combining 100GbE uplinks and 25GbE downlinks via breakout cables.
Technical Specifications
OEM: NVIDIA Mellanox
Model: MSN3800-CS2F
NVIDIA P/N: 920-9N210-00F7-0X1
Switch ASIC: NVIDIA Spectrum-2
Port Configuration: 64 x QSFP28
Per-Port Speed: 100GbE (4x25G NRZ)
Aggregate Throughput: 6.4 Tb/s
Form Factor: 2U rackmount
Airflow Direction: P2C (Power-to-Connector, reverse airflow)
Operating System: Mellanox Onyx OS pre-installed
Management: Fully managed (L2/L3, EVPN/VXLAN, automation, telemetry)
Power Supplies: Dual hot-swap redundant AC
Cooling: Hot-swap fan modules
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Compatible with QSFP28 100GbE optics and DACs (NVIDIA MMA1B00-C100, MFA1A00-C-series AOCs, MCP1600 series passive copper) and QSFP+ 40GbE modules at backward-compatible rates with proper port configuration. Supports 4x25GbE breakout to SFP28 endpoints with breakout cables. NOT a QSFP56 200GbE switch — cannot accept native 200GbE optics; for 200GbE the equivalent platform is the MSN4600 series. NOT an InfiniBand switch — for HDR InfiniBand fabrics the QM8700 is the equivalent SKU. NOT a C2P airflow unit; for standard front-to-back cooling racks the equivalent SKU is MSN3800-CS2R (or CS2RC for HV PSU). The Spectrum-2 ASIC predates Spectrum-3 SN4000 features and Spectrum-4 SN5000 features; advanced features tied to newer silicon are not available.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS bench-tests every MSN3800-CS2F for full port link training, PSU redundancy, fan module RPM, and Onyx OS boot integrity prior to dispatch. We provide global shipping, technical procurement consultation for 100GbE Spectrum-2 fabric design, and a 1–3 business day handling time. Visit tes-itsolutions.com for current stock across the NVIDIA Spectrum-2 platform.