Mellanox SN2700-CS2ROS 100GbE 32-Port QSFP28 Switch Used
Quick answer: NVIDIA Spectrum SN2700 MSN2700-CS2ROS used, bench-tested. Mellanox Spectrum SN2700 with 32 QSFP28 ports at 100GbE, 6.4 Tb/s, 1U, C2P airflow, shipping as an ONIE build so you install the network OS you standardise on.
In stock: MSN2700-CS2ROS 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 MSN2700-CS2ROS) 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 SN2700
The NVIDIA Spectrum SN2700 (CS2ROS) is the 100GbE workhorse that most 25G/100G racks were built around: 32 QSFP28 ports, 6.4 Tb/s, roughly 300 ns cut-through latency and a 12 MB shared buffer, in 1U. This is the ONIE build with C2P airflow, so it suits teams that image their own NOS and racks wired from the cabling side.
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 | MSN2700-CS2ROS |
| Family | NVIDIA Spectrum SN2700 |
| Switch silicon | NVIDIA Spectrum |
| Ports | 32 × 100GbE QSFP28 |
| Port speed | 100GbE per port (50/40/25GbE with breakouts) |
| Connectors | QSFP28 (32 ports) |
| Switching capacity | 6.4 Tb/s |
| Latency | ≈300 ns cut-through |
| Packet buffer | 12 MB shared packet buffer |
| Airflow | C2P — connector-to-power (back-to-front) |
| Form factor | 1U rackmount, standard depth |
| Power | 2 × hot-swap AC PSU (1+1), hot-swap fans |
| Management | x86 control plane, RJ45 management and console |
| Software | ONIE — install Onyx, Cumulus Linux or SONiC |
Key features
- 32 × 100GbE QSFP28 ports
- 6.4 Tb/s switching capacity
- ≈300 ns cut-through latency, 12 MB buffer
- Breakout to 4 × 25GbE per port (up to 128 × 25GbE)
- ONIE build for Onyx, Cumulus Linux or SONiC
- C2P airflow, dual hot-swap PSU
Typical deployments
100G leaf and ToR layers, 25G server aggregation, storage fabrics, and lab or CI fabrics where the team installs its own network OS.
What is included
- Switch chassis with both power supplies
- Fan units (C2P)
- Rail kit
- Condition report and bench-test notes
Not included
- Network OS image and licence (ONIE build)
- QSFP28 optics and cables
MSN2700-CS2ROS in the lineup
The SN2700 is the cheapest way into 32 × 100G in 1U, at the cost of an older ASIC with a 12 MB buffer and no 200G option. If the fabric is heading to 200G or needs a deeper buffer for RoCEv2, the SN3700/SN3700C is the better buy even at a higher price.
How it compares with models we also stock
| Model | Fabric | Ports | Best for |
|---|---|---|---|
| MSN2700-CS2ROS | Ethernet 100G | 32 QSFP28 | ONIE build, C2P airflow |
| MSN2700-CS2F | Ethernet 100G | 32 QSFP28 | Onyx build, P2C airflow |
| MSN2700-CS2R | Ethernet 100G | 32 QSFP28 | Onyx build, C2P airflow |
| MSN3700-CS2F | Ethernet 100G | 32 QSFP28 | Newer ASIC, 42 MB buffer, 425 ns |
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 MSN2700-CS2ROS, 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
Does it ship with a network operating system?
No. CS2ROS is the ONIE build — the switch boots to ONIE and you install Onyx, Cumulus Linux or SONiC.
What does CS2ROS mean?
C for 100GbE, S2 for the standard-depth 1U chassis, R for connector-to-power airflow, O for ONIE, NVIDIA's public ordering tables list this build as ONIE with C2P airflow; the trailing S is an ordering-code variant that NVIDIA does not decode publicly.
How many ports and at what speed?
32 QSFP28 ports at 100GbE, breakable to 4 × 25GbE each.
Is this an InfiniBand switch?
No. It is Ethernet. For 100G InfiniBand, the matching platform is the SB7700 EDR switch.
What is the buffer size and why does it matter?
12 MB shared. That is fine for ToR and mixed traffic, but RoCEv2 storage and AI fabrics benefit from the 42 MB buffer on the SN3700/SN3800.
Can I use 40G optics in it?
Yes, QSFP28 ports run 40GbE as well as 100/50/25GbE, so mixed-speed links are fine per port.
What warranty do you provide?
90-day warranty from delivery, on a unit bench-tested on our own line.
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.