NVIDIA Mellanox MSN3700-CS2RO Spectrum-2 100GbE 32x QSFP28 Switch ONIE 1U: The NVIDIA Mellanox MSN3700-CS2RO is a 1U Open Ethernet switch with 32 QSFP28 ports running 100GbE line rate per port, built on the NVIDIA Spectrum-2 ASIC. It ships with ONIE only (no NOS pre-installed), giving the operator full control to install Cumulus Linux, SONiC, NVIDIA Onyx, or DENT. Airflow on the -CS2RO SKU is C2P (Connector-to-Power, port-side intake). This is the 32× QSFP28 configuration of the SN3700 family — not the 48× SFP28 + 6× QSFP28 SN3420 variant. This is a refurbished unit.
Engineering Context
Spectrum-2 provides 6.4 Tb/s switching capacity with line-rate L2/L3 forwarding on every port, including IPv4/IPv6 routing, BGP-EVPN VXLAN, and full ECMP. Each QSFP28 port supports breakout to 4× 25GbE or 2× 50GbE, taking the maximum effective port count to 128 × 25GbE. Hardware-accelerated What-Just-Happened (WJH) telemetry exposes per-flow drop reasons. Power is 1+1 redundant hot-swappable AC. The switch ships with a rail kit per the vendor's standard SN3700 packaging.
Deployment & Use Cases
Open networking deployments where the operator wants to run SONiC or Cumulus Linux on Spectrum-2 silicon. 100GbE leaf in a Spectrum-2/Spectrum-3 spine-leaf fabric. AI training clusters using 100GbE per node and RoCEv2. NVMe-oF storage backbone with deterministic latency and zero packet loss. Service-provider and enterprise core/aggregation needing high-radix 100GbE.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number / MPN: MSN3700-CS2RO (PN 920-9N201-00R7-0N0)
Switch Silicon: NVIDIA Spectrum-2
Ports: 32 × QSFP28 (100GbE, 4×25 / 2×50 breakout capable)
Switching Capacity: 6.4 Tb/s
Operating System: ONIE only — install SONiC / Cumulus / Onyx / DENT
Form Factor: 1U rackmount
Airflow: C2P (port-side intake)
Power Supplies: 2 × hot-swappable AC, 1+1 redundant
Telemetry: What-Just-Happened (WJH), sFlow
Rail Kit: Included per SN3700 standard
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with QSFP28 100G DAC/AOC/transceivers and ConnectX-4/5/6 100GbE adapters. Spectrum-2 supports SONiC, Cumulus Linux 4.x+, NVIDIA Onyx, and DENT via ONIE. Not pre-loaded with a NOS — buyer must provide and install one. Not the SN3420 SKU — this is the 32× QSFP28 variant, not the 48× SFP28 mixed-port platform. C2P airflow only — for the reverse airflow variant choose -CS2FO. Does not support 200GbE QSFP56 optics natively (port speed is 100GbE max).
Why TES
T.E.S IT-SOLUTIONS tests every Spectrum-2 switch for full port link training, PSU redundancy under load, fan health, and ONIE boot integrity before shipment. Visit tes-itsolutions.com for NOS guidance, optic compatibility, and global shipping. Standard handling time is 1–3 business days.