Mellanox SN3700-VS2R 200GbE 32-Port QSFP56 Switch Used
Quick answer: NVIDIA Spectrum-2 SN3700 MSN3700-VS2R used, bench-tested. NVIDIA Spectrum-2 SN3700 with 32 QSFP56 ports at 200GbE, 6.4 Tb/s switching capacity (32 × 200GbE, non-blocking), 425 ns latency, 42 MB buffer, 1U and C2P airflow, running Onyx.
In stock: MSN3700-VS2R 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-VS2R) 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 SN3700
The NVIDIA Spectrum-2 SN3700 (VS2R) packs 32 QSFP56 ports of 200GbE into 1U: 6.4 Tb/s switching capacity (32 × 200GbE, non-blocking), 8.33 Bpps, 425 ns latency and a 42 MB shared buffer for lossless RoCEv2. Each port breaks out to 2 × 100GbE or 4 × 50GbE, which makes it a 200G leaf and a 100G server aggregator in the same box. This build ships with Onyx and C2P airflow.
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-VS2R |
| Family | NVIDIA Spectrum-2 SN3700 |
| Switch silicon | NVIDIA Spectrum-2 |
| Ports | 32 × 200GbE QSFP56 |
| Port speed | 200GbE per port (100/50/40/25GbE with breakouts) |
| Connectors | QSFP56 (32 ports) |
| Switching capacity | 6.4 Tb/s switching capacity (32 × 200GbE, non-blocking) |
| Latency | 425 ns |
| Packet buffer | 42 MB shared packet buffer |
| Airflow | C2P — connector-to-power (back-to-front) |
| Form factor | 1U rackmount, standard depth |
| Dimensions | 44 × 428 × 559 mm |
| Power | 2 × hot-swap AC PSU (1+1), 6 × hot-swap fans |
| Management | x86 quad-core control plane, 8 GB RAM, 32 GB SSD |
| Software | NVIDIA Onyx |
Key features
- 32 × 200GbE QSFP56 ports
- 6.4 Tb/s switching capacity (32 × 200GbE, non-blocking), 8.33 Bpps
- 425 ns latency, 42 MB shared buffer
- Breakout to 2 × 100GbE or 4 × 50GbE per port
- RoCEv2 with PFC and ECN for lossless storage and AI traffic
- VXLAN and EVPN support, C2P airflow
Typical deployments
200G leaf/spine in AI and storage fabrics, 100G server aggregation with breakouts, and EVPN-VXLAN overlays in racks wired for reverse airflow.
What is included
- Switch chassis with both power supplies
- Fan units (C2P)
- Rail kit
- Condition report and bench-test notes
Not included
- QSFP56 optics and cables
- Optional NOS licences beyond the shipped image
MSN3700-VS2R in the lineup
The SN3700 is the 200G workhorse of the Spectrum-2 line: same 1U footprint as the SN2700 but double the port speed. Take the SN3700C variant instead when every downlink is 100GbE and you want to avoid paying for 200G ports you cannot fill.
How it compares with models we also stock
| Model | Fabric | Ports | Best for |
|---|---|---|---|
| MSN3700-VS2R | Ethernet 200G | 32 QSFP56 | 200G leaf with reverse airflow |
| MSN3700-VS2F | Ethernet 200G | 32 QSFP56 | Same switch, P2C airflow |
| MSN3700-CS2F | Ethernet 100G | 32 QSFP28 | 100G-only leaf, P2C airflow |
| MSN3800-CS2RO | Ethernet 100G | 64 QSFP28 | Higher port count, 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-VS2R, 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 the SN3700 32 ports of 200G or 36 ports of 100G?
32 ports of 200GbE QSFP56. Port counts of 36 belong to the older SB7700 EDR InfiniBand switch, which is a different platform.
What does VS2R mean?
V for 200GbE, S2 for the standard-depth 1U chassis, R for connector-to-power (back-to-front) airflow.
Which NOS is installed?
Onyx. The Cumulus Linux build is VS2FC and the ONIE-only build is VS2FO if you prefer to install your own image.
Can it run 100G servers?
Yes. Break each 200GbE port into 2 × 100GbE or 4 × 50GbE with the right cables, giving up to 64 × 100GbE downlinks from one switch.
Does it support RoCEv2 lossless traffic?
Yes — PFC, ECN and shared buffer tuning support RoCEv2 for storage and distributed training.
Is this an InfiniBand switch?
No. The SN3700 is Ethernet. Native InfiniBand at 200G is the Quantum QM8700, and 400G is QM9700/QM9790.
What warranty do you provide?
90-day warranty from delivery, on a unit cleaned, re-flashed and bench-tested in-house.
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.