NVIDIA Mellanox MSN3420-CB2RO Spectrum-2 1U Open Ethernet Switch: This is a 48-port SFP28 plus 12-port QSFP28 top-of-rack Ethernet switch built on the NVIDIA Mellanox Spectrum-2 ASIC. The MSN3420-CB2RO is a managed Layer 2/Layer 3 leaf switch with ONIE bootloader only, no NOS pre-installed. This is NOT an InfiniBand switch and NOT a fixed 100GbE-only switch. NVIDIA factory part reference: 920-9N213-00R7-0N0. This is a refurbished unit, tested.
Engineering Context: The MSN3420 platform is built on a single Spectrum-2 ASIC providing 4.8 Tbps non-blocking switching capacity. The 48 SFP28 access ports each operate at 10 or 25 GbE; the 12 QSFP28 uplink ports each operate at 40 or 100 GbE and support 4x10/4x25 breakout. The Spectrum-2 ASIC delivers fully shared packet buffers, hardware VXLAN routing, IPv6 ACLs at line rate, and streaming telemetry. The MSN3420-CB2RO ships with C2P (connector-to-port, back-to-front) airflow.
Deployment & Use Cases: Designed as a top-of-rack leaf in modern 25/100GbE data center fabrics, as a converged access switch for AI/ML training clusters using RoCEv2, as an NVMe-oF and Ceph storage backbone, and as a leaf in VXLAN/EVPN multi-tenant environments. Suitable for VMware NSX, Kubernetes overlay networks, and OpenStack Neutron integrations.
Technical Specifications:
Switch ASIC: NVIDIA Mellanox Spectrum-2 (single chip)
Access ports: 48x SFP28 (10/25 GbE)
Uplink ports: 12x QSFP28 (40/100 GbE, 4x25 / 4x10 breakout supported)
Switching capacity: 4.8 Tbps non-blocking
Form factor: 1U, standard depth
CPU: x86 control plane
Operating system: ONIE only (ONIE bootloader only, no NOS pre-installed)
Power supplies: 2x hot-swappable redundant AC
Airflow: C2P (connector-to-port, back-to-front)
Management: 1x RJ-45 management, 1x console, 1x USB
NVIDIA factory part reference: 920-9N213-00R7-0N0
Condition: Refurbished, fully tested
Compatibility & Constraints: Compatible with NVIDIA Mellanox SFP28 and QSFP28 transceivers, DACs, and AOCs, and tested third-party optics. Pairs with NVIDIA ConnectX-4/5/6 adapters and Bluefield DPUs at 25/100 GbE. The C2P airflow direction must match the rest of the cold-aisle row to avoid hot-aisle recirculation. This SKU ships with ONIE only and requires the operator to install Onyx, Cumulus Linux, SONiC, or another ONIE-compatible network OS before production use. This switch is Ethernet-only.
Why TES: T.E.S IT-Solutions sources, tests, and supplies refurbished NVIDIA Mellanox networking hardware to integrators and end users worldwide. Each unit ships fully tested with handling time of 1 to 3 business days. Visit tes-itsolutions.com for the full inventory and to request a quote.