Catalyst 3750 & 3850 EOL: Upgrade Path to Catalyst 9000

Aug 10 , 2026 6

TL;DR: Catalyst 3750, 3750-X and 3850 switches are all end-of-life. The designated upgrade path is the Catalyst 9300 series. Because the 3850 already runs IOS-XE, the migration is a low-risk hardware swap — and pre-owned 9300 units make the refresh budget-friendly.

EOL Status of the 3750 and 3850

The Catalyst 3750/3750-E reached EOL in 2016, the 3750-X in 2019, and the 3850 in 2021. All three families are now past their last day of support. If you run them in production, you are running unsupported hardware — a compliance and security exposure that grows every quarter.

Why the 9300 Is the Natural Successor

The Catalyst 9300 keeps everything your team already knows: IOS-XE CLI, StackWise stacking, UADP ASICs, PoE+/PoE++ options. On top of that you get multi-gig ports (9300M), 25G uplinks, and years of software support ahead. For most campus access networks, the 9300 is a drop-in replacement.

The Cost-Optimized Migration Path

Enterprises often refresh by buying pre-owned Catalyst 9300 switches rather than new, which typically cuts the hardware bill dramatically while still delivering a supported platform. A phased plan:

1. Prioritize IDFs carrying sensitive traffic or compliance scope.
2. Lab-test the 9300 with the translated 3850 config for one week.
3. Cut over at night, one stack at a time, keeping the old stack as rollback.
4. Sell or trade in the 3750/3850 fleet — many dealers offer credit toward the pre-owned 9300 purchase.

Where the 3750/3850 Still Fits

If you need extra access capacity and the segment is not compliance-scoped, a used 3850 with documented port-level testing is one of the best value buys in networking. The same applies to spare stacks for parts and rapid replacement.

Looking for reliable used network equipment at a fair price? Send us the model list and we will reply with availability and pricing within 24 hours.

FAQ

Q: Are the Catalyst 3750 and 3850 end-of-life?

A: Yes. The 3750/3750-E entered EOL in 2016 and the 3750-X in 2019; the Catalyst 3850 entered EOL in 2021. The Catalyst 9300 is the designated successor for all of them.

Q: Can I replace a 3850 with a 9300 in the same rack?

A: Yes. The 9300 is the same 1RU form factor with the same stacking model (now StackWise-480/960) and IOS-XE, so the physical swap and config migration are straightforward.

Q: What is the difference between Catalyst 3850 and 9300?

A: The 9300 brings newer UADP 2.0 ASICs, higher stacking bandwidth, multi-gig and 25G uplink options, and longer software support. The 3850 remains a capable switch, which is why used 3850 units are still popular for budget access.

Q: Is buying a used 3850 in 2026 a bad idea?

A: Not at all, if the price reflects the EOL status. A used 3850 with a testing record and warranty is an excellent value for non-critical access or lab roles. For compliance-bound segments, prefer the 9300.

Q: How do I migrate the configuration from 3850 to 9300?

A: Export the running config, map ports and stack members, load the config on the 9300 in the lab, fix interface-specific differences, then cut over with a documented rollback.

Q: What about the Catalyst 3750-X PoE models?

A: The 3750-X PoE+ models are succeeded by the 9300 with PoE+ or the 9300M for multi-gig PoE. Used 9300 units with 24/48 PoE+ ports cover the same access workloads.

Need help deciding which pre-owned model fits your network? Contact our engineers or message us directly on WhatsApp — we answer technical questions for free.