NVIDIA Mellanox MSN2100-CB2RO Spectrum-Based 100GbE Open Ethernet Switch with Mellanox Onyx OS: This is a 1U short-depth top-of-rack Ethernet switch with 16 QSFP28 ports, factory pre-loaded with Mellanox Onyx (formerly MLNX-OS). NVIDIA part number 920-9N100-00R7-0N0. This is an Onyx-loaded SKU, not the ONIE-only MSN2100-CB2R or the Cumulus-loaded MSN2100-CB2RC. This is a refurbished unit, fully tested.
Engineering Context
The MSN2100-CB2RO is built on the Mellanox Spectrum ASIC and provides 3.2 Tb/s of non-blocking switching capacity across 16 QSFP28 ports operating at 100GbE per port. Each QSFP28 port can be split into 2x50GbE or 4x25GbE/4x10GbE breakouts, giving up to 64 SFP-equivalent ports of 25GbE on a single 1U chassis. The switch ships with a C2P (Connector-to-Power) airflow direction, dual hot-swappable AC PSUs, and an Intel Atom (Rangeley) control-plane CPU.
Deployment & Use Cases
Targeted at top-of-rack and short-depth edge cabinets, micro-data-centers, leaf positions in 100GbE spine-leaf fabrics, telco / MEC enclosures, and HPC and AI cluster aggregation. Onyx provides a CLI familiar to operators from Cisco and Arista environments, with Layer-2 / Layer-3 features, MLAG, BGP, OSPF, VXLAN EVPN, and What Just Happened (WJH) telemetry.
Technical Specifications
Switching ASIC: Mellanox Spectrum (SN2000 family)
Throughput: 3.2 Tb/s non-blocking
Port-to-port latency: ~300 ns (cut-through)
Ports: 16x QSFP28 at 100GbE per port
Breakout: 2x50GbE or 4x25GbE / 4x10GbE per port (up to 64 SFP-equivalent)
Form factor: 1U, short depth
Airflow: C2P (Connector-to-Power, front-to-back from connector side)
Power supplies: 2x hot-swappable AC, redundant
Control CPU: Intel Atom (Rangeley)
Pre-loaded OS: Mellanox Onyx (formerly MLNX-OS)
NVIDIA P/N: 920-9N100-00R7-0N0
Compatibility & Constraints
Pairs with NVIDIA Mellanox QSFP28 100GbE optics, DACs (MCP1600 series), AOCs (MFA1A00 series), and 4x25GbE breakout cables (MCP7H00 series). Operates with ConnectX-4 / -5 / -6 adapters end-host. The 'RO' suffix denotes Onyx OS pre-loaded; if Cumulus Linux is required pick MSN2100-CB2RC, and for ONIE-only / bring-your-own-OS pick MSN2100-CB2R. Rail kit is sold separately. Power redundancy requires both PSUs populated and connected to independent feeds.
Frequently Asked Questions (FAQ)
Q. What is the Data Rate of the MSN2100-CB2RO?
The data rate of the MSN2100-CB2RO is 100GbE.
Q. Is the MSN2100-CB2RO supplied new or refurbished, and who supplies it?
The MSN2100-CB2RO is supplied refurbished by T.E.S IT-SOLUTIONS, lab-tested before dispatch and shipped from EU stock with 1-3 business day handling. Full listing and current pricing at tes-itsolutions.com.

Why TES
T.E.S IT-SOLUTIONS ships this switch professionally refurbished and tested, with port diagnostics and firmware verified. Handling time is 1–3 business days; worldwide shipping is available. For multi-unit pricing, integration support, or compatibility questions, contact us before ordering.