NVIDIA Mellanox MSN2700-CS2ROS SN2700 32x 100GbE QSFP28 Spectrum Switch — ONIE, C2P Airflow, Refurbished
Warranty: Lifetime
ONIE build with C2P airflow — bring your own network OS, ports on the cold aisle
NVIDIA Mellanox MSN2700-CS2ROS — Spectrum SN2700, 32x 100GbE QSFP28, 1U
→ Check airflow first. C2P means air enters at the port (connector) side and leaves at the power-supply side. If your rack has the PSU side on the cold aisle, you need a P2C unit such as the MSN2700-CS2F instead.
Part Number: MSN2700-CS2ROS
Platform: NVIDIA Spectrum SN2700
Description: 1U Open Ethernet switch, 32 QSFP28 100GbE ports, ONIE (no pre-installed network OS), 2 hot-swap AC PSUs, C2P airflow
The MSN2700-CS2ROS ships with ONIE (Open Network Install Environment) instead of a pre-installed network OS, so you load the NOS your fabric already runs. It is the right unit when you are standardizing on an open NOS and your racks pull cold air in at the port side.
Every port runs 10 to 100GbE, so one SN2700 can serve as a 100G spine or a 25G top-of-rack switch with breakout cables. The CS2ROS suffix is a C2P ONIE variant that does not appear on NVIDIA's public ordering list; NVIDIA's closest listed part is the MSN2700-CS2RO (ONIE, C2P).
Which One Do I Need?
| Part number | Network OS (as ordered) | Airflow |
|---|---|---|
| MSN2700-CS2F | NVIDIA Onyx | P2C |
| MSN2700-CS2R | NVIDIA Onyx | C2P |
| MSN2700-CS2FC | Cumulus Linux | P2C |
| MSN2700-CS2RC | Cumulus Linux | C2P |
| MSN2700-CS2FO | ONIE (no network OS) | P2C |
| MSN2700-CS2RO | ONIE (no network OS) | C2P |
| MSN2700-CS2ROS — this listing | ONIE (no network OS) | C2P — a CS2RO variant not on NVIDIA's public ordering list |
The suffix is the order, not the hardware. Airflow is set by the fan and PSU modules; the network OS is software. Match airflow to your hot and cold aisles before anything else.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | MSN2700-CS2ROS |
| Platform | NVIDIA Spectrum SN2700, 1U, standard depth, 19" rack mount |
| Ports | 32x QSFP28, 10/25/40/50/56/100GbE per port |
| Max ports by speed | 32x 100GbE · 64x 50GbE · 32x 40GbE · 64x 25GbE · 64x 10GbE (with splitter cables) |
| Throughput | 6.4Tb/s switching capacity (3.2Tb/s one direction) |
| Packet rate | 4.76 Bpps |
| Latency | 300ns, cut-through |
| Packet buffer | 16MB, fully shared |
| CPU / memory | Intel x86 dual-core 1.40GHz · 8GB DDR3 · 16GB or 32GB SSD depending on switch revision |
| Power supplies | 2x hot-swap AC, 1+1 redundant · 130W typical with passive cables (ATIS) |
| Fans | 4x hot-swap, N+1 redundant |
| Network OS (as ordered) | ONIE — install the NOS of your choice |
| Airflow | C2P (connector-to-power): air in at the ports, out at the PSU side |
| Dimensions | 43.8 x 427.83 x 686.8mm (1.72 x 16.84 x 27in) |
| Weight | 11.1kg with 2 PSUs (24.5lb) |
| Operating temperature | 0 to 40°C |
| Lifecycle | NVIDIA lists this switch family as End of Life (EOL) |
| Condition | Refurbished |
| Warranty | Lifetime, backed by Resilient Tec |
Source: NVIDIA Spectrum SN2000 hardware user manual (specifications, ordering information) and the NVIDIA SN2000 series datasheet.
Note on Throughput: 3.2Tb/s or 6.4Tb/s?
NVIDIA's datasheet quotes 3.2Tb/s and its hardware manual quotes 6.4Tb/s for the same switch. Both are right: 32 ports x 100GbE is 3.2Tb/s in one direction and 6.4Tb/s counting both directions. The switch is non-blocking either way.
Good to Know
- Airflow must match the rack. P2C (power-to-connector) pulls air in at the power-supply side and exhausts at the ports; C2P is the reverse. NVIDIA color-codes the PSU and fan modules by airflow direction, so check them against the part number.
- 4x25G breakouts cost a port. Per NVIDIA's manual, splitting a QSFP28 port into four 25GbE links disables (unmaps) the port directly below it. 2x50G splits do not. Plan cabling before you count ports.
- 40GbE look-alikes. Part numbers with B in place of C (for example MSN2700-BS2F) are the 40GbE version, not this 100GbE switch.
- Same hardware, different OS as ordered. Every 100GbE SN2700 in the table above is the same Spectrum hardware; the suffix records the OS it shipped with and the airflow.
- EOL platform. NVIDIA no longer sells new SN2000 systems. That is why refurbished units are the practical way to expand or spare an existing SN2700 fabric.
- ONIE means no OS out of the box. Plan to install your NOS image before the switch passes traffic. Tell us which NOS you run and we will confirm it lists the SN2700 before you order.
Quick Checklist — Is This the Right Switch?
You need 32 ports of 100GbE QSFP28 in 1U. Your rack draws cold air in at the port side (C2P). You plan to install your own network OS through ONIE. You want dual hot-swap power supplies and hot-swap fans.
Availability
Refurbished and shipped from Resilient Tec in Knoxville, TN · Free standard shipping on US orders.
Need more than one, or a P2C unit for the other side of the row? Tell us how many ports you are building and we will quote switches and cabling together. Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. On switches that means advance replacement when we have one in stock, otherwise repair or replacement with an equivalent unit, from a named seller in the US.
You Might Also Need
- MCP1600-C001 100G QSFP28 passive DAC, 1 m — switch-to-server or switch-to-switch inside the rack
- MCP1600-C003 100G QSFP28 passive DAC, 3 m — the next rack over
- NVIDIA MCP7F00-A002R30N 100G to 4x25G breakout DAC, 2 m — one QSFP28 port to four 25GbE server links
- MMA1B00-C100D 100G QSFP28 SR4 transceiver and MFA1A00-C003 100G AOC — for runs past passive copper
- Product guides — structured cabling, switches and the rest of the rack
Related Guides
QSFP28 Breakout Cables: 100G to 4x25G vs 4x10G Guide
DAC Cable No Link? Fix 25G/100G FEC Mismatches (2026 Guide)
100G QSFP28 DAC Cables for AI Homelab Clusters: The ConnectX Cable Guide (2026)
ONIE build with C2P airflow — bring your own network OS, ports on the cold aisle
NVIDIA Mellanox MSN2700-CS2ROS — Spectrum SN2700, 32x 100GbE QSFP28, 1U
→ Check airflow first. C2P means air enters at the port (connector) side and leaves at the power-supply side. If your rack has the PSU side on the cold aisle, you need a P2C unit such as the MSN2700-CS2F instead.
Part Number: MSN2700-CS2ROS
Platform: NVIDIA Spectrum SN2700
Description: 1U Open Ethernet switch, 32 QSFP28 100GbE ports, ONIE (no pre-installed network OS), 2 hot-swap AC PSUs, C2P airflow
The MSN2700-CS2ROS ships with ONIE (Open Network Install Environment) instead of a pre-installed network OS, so you load the NOS your fabric already runs. It is the right unit when you are standardizing on an open NOS and your racks pull cold air in at the port side.
Every port runs 10 to 100GbE, so one SN2700 can serve as a 100G spine or a 25G top-of-rack switch with breakout cables. The CS2ROS suffix is a C2P ONIE variant that does not appear on NVIDIA's public ordering list; NVIDIA's closest listed part is the MSN2700-CS2RO (ONIE, C2P).
Which One Do I Need?
| Part number | Network OS (as ordered) | Airflow |
|---|---|---|
| MSN2700-CS2F | NVIDIA Onyx | P2C |
| MSN2700-CS2R | NVIDIA Onyx | C2P |
| MSN2700-CS2FC | Cumulus Linux | P2C |
| MSN2700-CS2RC | Cumulus Linux | C2P |
| MSN2700-CS2FO | ONIE (no network OS) | P2C |
| MSN2700-CS2RO | ONIE (no network OS) | C2P |
| MSN2700-CS2ROS — this listing | ONIE (no network OS) | C2P — a CS2RO variant not on NVIDIA's public ordering list |
The suffix is the order, not the hardware. Airflow is set by the fan and PSU modules; the network OS is software. Match airflow to your hot and cold aisles before anything else.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | MSN2700-CS2ROS |
| Platform | NVIDIA Spectrum SN2700, 1U, standard depth, 19" rack mount |
| Ports | 32x QSFP28, 10/25/40/50/56/100GbE per port |
| Max ports by speed | 32x 100GbE · 64x 50GbE · 32x 40GbE · 64x 25GbE · 64x 10GbE (with splitter cables) |
| Throughput | 6.4Tb/s switching capacity (3.2Tb/s one direction) |
| Packet rate | 4.76 Bpps |
| Latency | 300ns, cut-through |
| Packet buffer | 16MB, fully shared |
| CPU / memory | Intel x86 dual-core 1.40GHz · 8GB DDR3 · 16GB or 32GB SSD depending on switch revision |
| Power supplies | 2x hot-swap AC, 1+1 redundant · 130W typical with passive cables (ATIS) |
| Fans | 4x hot-swap, N+1 redundant |
| Network OS (as ordered) | ONIE — install the NOS of your choice |
| Airflow | C2P (connector-to-power): air in at the ports, out at the PSU side |
| Dimensions | 43.8 x 427.83 x 686.8mm (1.72 x 16.84 x 27in) |
| Weight | 11.1kg with 2 PSUs (24.5lb) |
| Operating temperature | 0 to 40°C |
| Lifecycle | NVIDIA lists this switch family as End of Life (EOL) |
| Condition | Refurbished |
| Warranty | Lifetime, backed by Resilient Tec |
Source: NVIDIA Spectrum SN2000 hardware user manual (specifications, ordering information) and the NVIDIA SN2000 series datasheet.
Note on Throughput: 3.2Tb/s or 6.4Tb/s?
NVIDIA's datasheet quotes 3.2Tb/s and its hardware manual quotes 6.4Tb/s for the same switch. Both are right: 32 ports x 100GbE is 3.2Tb/s in one direction and 6.4Tb/s counting both directions. The switch is non-blocking either way.
Good to Know
- Airflow must match the rack. P2C (power-to-connector) pulls air in at the power-supply side and exhausts at the ports; C2P is the reverse. NVIDIA color-codes the PSU and fan modules by airflow direction, so check them against the part number.
- 4x25G breakouts cost a port. Per NVIDIA's manual, splitting a QSFP28 port into four 25GbE links disables (unmaps) the port directly below it. 2x50G splits do not. Plan cabling before you count ports.
- 40GbE look-alikes. Part numbers with B in place of C (for example MSN2700-BS2F) are the 40GbE version, not this 100GbE switch.
- Same hardware, different OS as ordered. Every 100GbE SN2700 in the table above is the same Spectrum hardware; the suffix records the OS it shipped with and the airflow.
- EOL platform. NVIDIA no longer sells new SN2000 systems. That is why refurbished units are the practical way to expand or spare an existing SN2700 fabric.
- ONIE means no OS out of the box. Plan to install your NOS image before the switch passes traffic. Tell us which NOS you run and we will confirm it lists the SN2700 before you order.
Quick Checklist — Is This the Right Switch?
You need 32 ports of 100GbE QSFP28 in 1U. Your rack draws cold air in at the port side (C2P). You plan to install your own network OS through ONIE. You want dual hot-swap power supplies and hot-swap fans.
Availability
Refurbished and shipped from Resilient Tec in Knoxville, TN · Free standard shipping on US orders.
Need more than one, or a P2C unit for the other side of the row? Tell us how many ports you are building and we will quote switches and cabling together. Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. On switches that means advance replacement when we have one in stock, otherwise repair or replacement with an equivalent unit, from a named seller in the US.
You Might Also Need
- MCP1600-C001 100G QSFP28 passive DAC, 1 m — switch-to-server or switch-to-switch inside the rack
- MCP1600-C003 100G QSFP28 passive DAC, 3 m — the next rack over
- NVIDIA MCP7F00-A002R30N 100G to 4x25G breakout DAC, 2 m — one QSFP28 port to four 25GbE server links
- MMA1B00-C100D 100G QSFP28 SR4 transceiver and MFA1A00-C003 100G AOC — for runs past passive copper
- Product guides — structured cabling, switches and the rest of the rack
Related Guides
QSFP28 Breakout Cables: 100G to 4x25G vs 4x10G Guide
DAC Cable No Link? Fix 25G/100G FEC Mismatches (2026 Guide)
100G QSFP28 DAC Cables for AI Homelab Clusters: The ConnectX Cable Guide (2026)