NVIDIA Mellanox MSN2700-CS2R 1U Open Ethernet Switch: This is a 1U fixed-configuration Spectrum-based Ethernet switch with 32 QSFP28 ports for 100GbE connectivity. The CS2R suffix denotes the dual AC PSU configuration with C2P (Connector-to-Power, reverse) airflow. This is a fully managed switch, not an unmanaged commodity device. This is a refurbished unit.
Engineering Context
The MSN2700-CS2R is built around the Mellanox Spectrum ASIC, providing wire-speed L2/L3 forwarding across all 32 ports of 100GbE. Each QSFP28 port can be split into 4×25GbE or 2×50GbE breakout configurations, yielding up to 64 × 50GbE or 128 × 25GbE logical ports for high-density leaf deployments. The switch supports ONIE for installation of Mellanox Onyx, Cumulus Linux, or SONiC. C2P airflow draws cool air from the port side and exhausts toward the PSU side — required when racks are reverse-oriented. Forwarding is non-blocking with cut-through latency.
Deployment & Use Cases
Spine-layer aggregation in 100GbE leaf-spine fabrics. Top-of-Rack switching for GPU and HPC compute clusters using ConnectX-4/5/6 adapters. NVMe-oF storage backbone connecting all-flash arrays. Hyperscale cloud deployments running SONiC. Reverse-airflow rack environments where standard front-to-back switches would create hotspots.
Technical Specifications
OEM: NVIDIA Mellanox
Part Number: MSN2700-CS2R
ASIC: Mellanox Spectrum
Port Configuration: 32 × QSFP28
Port Speed: 100GbE per port (with breakout to 25GbE/50GbE)
Form Factor: 1U rackmount
CPU: x86 control processor
Power Supplies: Dual AC, hot-swappable
Airflow: C2P (Connector-to-Power, reverse)
OS Support: Mellanox Onyx, Cumulus Linux, SONiC (ONIE-bootable)
Condition: Refurbished — Tested by T.E.S IT-SOLUTIONS
Compatibility & Constraints
Compatible with NVIDIA Mellanox QSFP28 DACs, AOCs, and SR4/LR4 transceivers. Pairs with ConnectX-4, ConnectX-5, ConnectX-6 Dx, and ConnectX-7 Ethernet adapters. Not an InfiniBand switch — for IB workloads, use a Quantum or SwitchIB-2 platform instead. Not compatible with front-to-back airflow rack designs without modification — verify rack airflow direction before ordering. Rail kit is not included and must be ordered separately.
Why TES
T.E.S IT-SOLUTIONS tests every switch under power, validates all 32 ports under traffic load, verifies PSU redundancy, and confirms fan and thermal operation prior to shipment. T.E.S IT-SOLUTIONS ships globally with 1–3 day handling and provides expert deployment consultation.