Mellanox SN3700-CS2F 100GbE 32-Port QSFP28 Switch Used
Quick answer: NVIDIA Spectrum-2 SN3700C MSN3700-CS2F used, bench-tested. NVIDIA Spectrum-2 SN3700C with 32 QSFP28 ports at 100GbE, 3.2 Tb/s switching capacity (32 × 100GbE, non-blocking), 425 ns latency, 42 MB buffer, 1U and P2C airflow, running Onyx.
In stock: MSN3700-CS2F is in stock — availability is confirmed per part number, so send the exact model you need and we check the shelf before quoting.
Need a quote? Message WhatsApp +86 13068616914 with the part number (for example MSN3700-CS2F) and the quantity — we reply with price, condition notes and photos of the actual unit. No price is listed here because every order is quoted per part number.
NVIDIA Spectrum-2 SN3700C
The NVIDIA Spectrum-2 SN3700C (CS2F) is the 100GbE build of the SN3700 chassis: 32 QSFP28 ports, 3.2 Tb/s switching capacity (32 × 100GbE, non-blocking), 4.76 Bpps, 425 ns latency and a 42 MB shared buffer. It keeps the deeper buffer and newer ASIC of Spectrum-2 while pricing every port at 100G — the sensible fit when your servers are 25G or 100G and nothing on the rack needs 200G.
Condition: Used — cleaned, re-flashed and bench-tested on our own test line before it is listed. 90-day warranty from delivery.
| Specification | Details |
|---|---|
| Part number | MSN3700-CS2F |
| Family | NVIDIA Spectrum-2 SN3700C |
| Switch silicon | NVIDIA Spectrum-2 |
| Ports | 32 × 100GbE QSFP28 |
| Port speed | 100GbE per port (50/40/25GbE with breakouts) |
| Connectors | QSFP28 (32 ports) |
| Switching capacity | 3.2 Tb/s switching capacity (32 × 100GbE, non-blocking) |
| Latency | 425 ns |
| Packet buffer | 42 MB shared packet buffer |
| Airflow | P2C — power-to-connector (front-to-back) |
| Form factor | 1U rackmount, standard depth |
| Dimensions | 44 × 428 × 559 mm |
| Power | 2 × hot-swap AC PSU (1+1), 4 × hot-swap fans |
| Management | x86 dual-core control plane, 8 GB RAM, 32 GB SSD |
| Software | NVIDIA Onyx |
Key features
- 32 × 100GbE QSFP28 ports
- 3.2 Tb/s switching capacity (32 × 100GbE, non-blocking), 4.76 Bpps
- 425 ns latency, 42 MB shared buffer
- Breakout to 4 × 25GbE or 2 × 50GbE per port
- RoCEv2 with PFC/ECN
- VXLAN, EVPN, MLAG support
Typical deployments
100G leaf and spine layers, 25G server aggregation, storage fabrics, and EVPN-VXLAN overlays in standard front-to-back racks.
What is included
- Switch chassis with both power supplies
- Fan units (P2C)
- Rail kit
- Condition report and bench-test notes
Not included
- QSFP28 optics and cables
- Additional NOS licences
MSN3700-CS2F in the lineup
The C in CS2F is the 100GbE port class, not a different chassis: SN3700C and SN3700 share the 1U body and 42 MB buffer, so the choice is port speed against cost per port. If any part of the rack is moving to 200G, buy VS2F/VS2R instead and run 100G through breakouts.
How it compares with models we also stock
| Model | Fabric | Ports | Best for |
|---|---|---|---|
| MSN3700-CS2F | Ethernet 100G | 32 QSFP28 | 100G leaf, P2C airflow |
| MSN3700-VS2F | Ethernet 200G | 32 QSFP56 | 200G leaf, 100G via breakout |
| MSN2700-CS2ROS | Ethernet 100G | 32 QSFP28 | Lower-cost 100G with ONIE |
| MSN3800-CS2RO | Ethernet 100G | 64 QSFP28 | Double the ports, 2U |
Why buy this switch from Zhongxin Data
- Bench-tested on our own in-house test line — ports, fans and power supplies are checked before the unit leaves.
- We quote only what we can physically confirm: the exact part number, airflow direction and condition notes come from the unit in front of us.
- Used enterprise switches at secondary-market pricing, with a 90-day warranty from delivery.
- Worldwide shipping from Hong Kong, China; consolidation with servers, NICs and optics from the same rack is routine.
Request a quote
Send the part number MSN3700-CS2F, the quantity you need and your destination to WhatsApp +86 13068616914 (or reply to any thread on zhongxindata.hk). We confirm availability against the exact model before quoting, and we can quote alternative airflow builds or port-count variants from the same family if they fit your rack better.
Frequently asked questions
Is SN3700-CS2F the same as SN3700C?
Yes. SN3700C is the model name for the 100GbE ports of the SN3700 chassis; MSN3700-CS2F is the ordering part number.
How many ports and at what speed?
32 QSFP28 ports at 100GbE, and each port breaks out to 4 × 25GbE or 2 × 50GbE.
What does CS2F mean?
C for 100GbE ports, S2 for the standard-depth 1U chassis, F for power-to-connector airflow.
Which NOS ships with it?
Onyx. The Cumulus Linux build is CS2FC and the ONIE build is CS2FO.
Is 200G possible on this unit?
No. 200G needs the VS2F/VS2R build with QSFP56 ports. Here the ceiling is 100GbE per port.
Does it do RoCEv2?
Yes, with PFC and ECN enabled, and the 42 MB buffer absorbs bursts better than the older 12 MB design.
What is the warranty?
90-day warranty from delivery.
Available at Zhongxin Data — enterprise network hardware specialists. Worldwide shipping from Hong Kong, China.
Product image is a reference image for the form factor — revision, label and airflow sticker vary by batch. Ask us for photos of the actual unit before you commit.