How to evaluate a used 100GbE switch supplier
- Exact SKU, not just port count. A quote should name the model and revision (for example SN3700-CS2FC), because port config, airflow and PSU loadout differ inside one family.
- Airflow direction. Power-to-connector and connector-to-power units are not interchangeable in a live rack; confirm the direction before ordering.
- Test scope. Ask what was actually checked: port link state, fan and PSU health, management interface access, and on what test setup.
- Optics and cabling plan. 100G transceivers and DACs are usually quoted separately; a supplier should confirm port compatibility against your list, not just sell the box.
- Included accessories. Rack rails, fan trays and power supplies are the usual small-print gaps in used switch purchases.
Used Mellanox 100GbE switches listed on zhongxindata.hk
Availability is confirmed per part number.
| Model | Key spec | Listing |
|---|---|---|
| Mellanox Spectrum SN2700-CS2FC | 32 x 100GbE QSFP28, 1U | Mellanox Spectrum SN2700-CS2FC |
| Mellanox Spectrum SN3700-CS2FC | 36 x 100GbE QSFP28, 1U | Mellanox Spectrum SN3700-CS2FC |
| Mellanox Spectrum SN3700-VS2FC | 36 x 100GbE QSFP28, 1U | Mellanox Spectrum SN3700-VS2FC |
| Mellanox Spectrum SN3800-CS2F | 64 x 100GbE QSFP28, 2U | Mellanox Spectrum SN3800-CS2F |
| Mellanox Spectrum SN4600-VS2F | 36 x 100GbE QSFP28, 1U managed | Mellanox Spectrum SN4600-VS2F |
What to check before you buy a used 100GbE switch
- Port breakout. QSFP28 ports can run 100G or break out to 4 x 25G; confirm the breakout mode and cable type your design needs.
- Switch software. Spectrum SN2000 and SN3000 series units run ONYX or Cumulus Linux; confirm the installed version matches what your automation expects.
- Power and cooling. 1U 100G switches are power dense; check PSU count, PSU rating and airflow direction against your rack.
- Layer 3 features. Confirm whether the unit is licensed and configured for the routing features your fabric needs; licensing state is stated per unit in the quote.
- Redundancy. Dual PSUs and redundant fan trays matter more in a spine role than in a lab; confirm both are present.
How ordering works
- Send the part number, quantity and your optics or cabling list on WhatsApp +86 13068616914.
- You receive a quote per part number, with the exact unit configuration stated.
- We confirm airflow direction, PSU and included accessories with you before the order is finalised.
- The switch is dispatched from Hong Kong, China with export documents included.
Related catalog
Get a wholesale quote
Message our B2B team on WhatsApp +86 13068616914 with the part numbers and quantities you need. Quotes are issued per part number and are valid the day they are issued.
Request a Quote on WhatsApp +86 13068616914
Switches we supply
- SN2700 is the 32-port 100GbE entry point for storage networking and aggregation
- SN3700 is the mainstream platform, available at 100GbE and 200GbE depending on the variant
- SN3800 and SN4600 are the 2U 64-port options for spine tiers and denser leaf rows
Choosing the variant before you order
- Airflow direction is a chassis property — P2C and C2P units are not interchangeable in a rack row
- Confirm whether the unit ships as ONIE or with a network OS installed, because that changes the operations runbook
- Check the port cage type against your optic choice, since QSFP28 and QSFP56 are not cross-compatible
How we test every switch before it is listed
- Cleaned, re-flashed and bench-tested on our own test line
- Port count, port speed, airflow direction, fan configuration and firmware level recorded per unit
- Ask for photos of the actual unit and the firmware level before you commit
Why a used switch makes sense for a fabric build
- A switch is a component with a defined specification, so the fitment question is straightforward once the model is right
- Secondary market pricing is strongest on the previous generation, which is where most fabric refreshes land
- We state the firmware level and the OS state per unit, so there is no ambiguity at install time
Related reading
- SN2700 100GbE switch — the entry-tier model
- SN3700 100GbE switch — the mainstream model
- Spectrum switch selection guide — the model-selection detail
- Network switches — category hub
Frequently Asked Questions
Which Mellanox 100GbE switches do you supply?
The SN2700, SN3700, SN3800 and SN4600 families are the ones we stock, and other models are quoted per part number. Send the model and the quantity and we will confirm what we can allocate, with the condition of each unit stated in the quote.
Does a used Mellanox switch come with a network OS installed?
It depends on the unit. Some ship as ONIE so you install the OS you standardise on, while others carry an installed network OS. We state exactly which of the two you are receiving, along with the firmware level, so there is no ambiguity at install time.
How do I know the airflow direction before I buy?
Airflow is fixed by the chassis rather than configurable, so it comes down to the exact part number. P2C suits a cold-aisle front-to-back layout and C2P a hot-aisle row. Send us the part number or the current switch model and we will confirm which you need.
How do you verify a used Mellanox switch?
We clean, re-flash and bench-test on our own test line, then confirm port count, port speed, airflow direction, fan configuration and firmware level against the part number. We test the fans under load, so a worn fan is disclosed rather than discovered later.
Can I mix used Mellanox switches in one fabric?
Yes, provided the port speed and the network OS match across the fabric. A mixed-speed fabric is normal — the SN3700 negotiates down to slower link rates — but the OS and configuration model should be consistent so you are not managing two control planes. Send your planned fabric and we will confirm the combination.
What warranty applies to a used switch?
90-day warranty from delivery, on a unit cleaned, re-flashed and bench-tested on our own test line. The condition of each unit is stated in the quote, and batch pricing applies to volume orders.