NVIDIA Mellanox MSN3700-CS2R 32-Port 100GbE QSFP28 Spectrum-2 Open Ethernet Switch with Onyx OS: This is a 1U managed Layer 2/3 Ethernet switch built on the NVIDIA Spectrum-2 ASIC, equipped with 32 QSFP28 ports for 100Gb/s Ethernet aggregation. The unit ships with Mellanox Onyx OS and uses C2P (Connector-to-Power) airflow. This is a fixed-port fixed-form-factor switch chassis, not a modular line card. This is a refurbished unit (NVIDIA P/N: 920-9N201-00R7-0X0).
Engineering Context
The MSN3700-CS2R uses the Spectrum-2 ASIC with up to 6.4 Tb/s of switching capacity. The 32 QSFP28 ports each operate natively at 100GbE, with optional breakout to 2x50GbE or 4x25GbE per port using QSFP28 breakout cables. C2P airflow (Connector-to-Power, also called reverse airflow) suits hot-aisle-front data center layouts. Dual hot-swappable AC power supplies provide N+N redundancy. Onyx OS provides a fully managed L2/L3 stack with BGP, OSPF, MLAG, VXLAN/EVPN, telemetry, and a CLI/REST/gNMI management interface.
Deployment & Use Cases
Spine and leaf positions in 100GbE Ethernet fabrics where C2P airflow is required. AI/ML compute cluster east-west networks. Cloud and hyperscaler aggregation. Enterprise core 100GbE deployments. Storage backbones for NVMe-over-Fabrics and distributed file systems. Carrier and service-provider edge.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MSN3700-CS2R (NVIDIA P/N 920-9N201-00R7-0X0)
ASIC: NVIDIA Spectrum-2
Port Configuration: 32 x QSFP28 (100GbE)
Switching Capacity: Up to 6.4 Tb/s
Form Factor: 1U Rackmount
Operating System: Mellanox Onyx
Airflow: C2P (Connector-to-Power, reverse)
Power Supplies: Dual AC, hot-swappable
Management: Out-of-band Ethernet, RJ45 console, USB
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Hard Constraints
Each QSFP28 port supports 100GbE natively or breakout to 4x25GbE / 2x50GbE with appropriate breakout cables. Compatible with standard NVIDIA Mellanox QSFP28 transceivers, DACs, and AOCs. Ethernet-only chassis (not VPI / not InfiniBand). C2P airflow runs opposite to standard P2C; the rack must be configured for hot-aisle-front intake. The CS2R is the C2P/Onyx variant — distinct from CS2F (P2C/Onyx) and CS2FC (P2C/Cumulus). Onyx licensing terms apply.
Why Choose T.E.S IT-SOLUTIONS
Every refurbished switch is bench-tested for port link-up, throughput, PSU redundancy, and thermals before shipment. Visit tes-itsolutions.com for our full Spectrum and Quantum lineup, ConnectX adapters, and DAC/AOC cabling. Handling time 1-3 business days.