Copper 3850 models hit their Last Day of Support on October 31, 2025. Fiber/SFP models get a reprieve until April 30, 2027. That gap matters if your stack mixes both.
This article breaks down the exact dates by model family, what running unsupported hardware actually risks, how to migrate to the Catalyst 9300, and how to recover cash from switches you're retiring.
Key Takeaways
- Copper 3850s (24P/T/U, 48P/T/U, related SKUs) hit Last Day of Support on October 31, 2025
- Fiber/SFP 3850s (12S, 24XS, 48XS) stay supported through April 30, 2027
- Unsupported switches get no security patches, no TAC help, and no RMA — a real compliance and operational risk
- Cisco’s named successor is the Catalyst 9300; verify shared PSUs/modules before reuse
- Extend 3850 life with third-party maintenance or refurbished spares—or sell units to fund a refresh
Understanding the Catalyst 3850 End-of-Life Timeline
Cisco split its Catalyst 3850 end-of-life notices into two separate bulletins — one for copper/base-port hardware, one for fiber SKUs. The dates differ by 18 months, which trips up teams who assume "3850" means one uniform deadline.
Catalyst 3850 Copper Switches
Per Cisco's end-of-sale and end-of-life bulletin for the Catalyst 3850 switches, the copper/base-port lifecycle runs:
| Milestone | Date |
|---|---|
| End-of-Life announcement | October 31, 2019 |
| End of Sale | October 30, 2020 |
| End of Software Maintenance | October 30, 2021 |
| Last Day of Support | October 31, 2025 |
This group covers 3850-24P/T/U, 3850-24XU, 3850-48P/T/U, C3850-12X48U, and 3850-48F models.
Catalyst 3850 Fiber Switches
The fiber SKU bulletin lays out a separate, later timeline:
| Milestone | Date |
|---|---|
| End-of-Life announcement | April 30, 2021 |
| End of Sale | April 30, 2022 |
| End of Software Maintenance | April 30, 2023 |
| Last Day of Support | April 30, 2027 |
This covers 3850-12S, 12XS, 16XS, 24S, 24XS, 32XS, and 48XS models.
If your stack mixes copper and fiber members, support is only as good as the oldest unit. One copper member puts the whole stack past support, even if every other switch is fiber. Verify the exact model on each unit — don't go by family name alone.
Cisco released the 3850 line on January 10, 2013. At well over a decade old, it lacks multi-gig mGig density, modern UPOE+ budgets, and the fabric-scale features most campus refreshes now expect.
Terminology teams often blur:
- End of Sale — Cisco stops selling new units
- End of Software Maintenance — no more IOS/IOS XE updates or bug fixes
- Last Day of Support — TAC cases closed, no RMAs, no security patches
Risks of Running Unsupported Catalyst 3850 Switches
Once a switch passes its Last Date of Support, three risk categories stack up fast.
Security exposure. CISA's guidance on end-of-support edge devices calls the exploitation threat to unsupported network hardware "substantial and constant." These devices no longer receive CVE patches, hotfixes, or defect fixes.
Switches sit beneath VLANs, VoIP, and Wi-Fi traffic. A compromised access-layer switch can become a pivot point into the rest of the network.
Compliance gaps. Regulated industries face real exposure here:
- HIPAA requires a thorough risk assessment covering hardware capabilities — an unsupported switch handling ePHI traffic becomes a documented risk factor
- PCI DSS v4.0.1 requires patching critical vulnerabilities within 30 days — impossible on hardware that no longer receives patches
- SOX/PCAOB audit frameworks assess IT control environments, including system maintenance — unsupported infrastructure weakens that evidence trail
Operational risk. No TAC support means no RMA path. When a switch fails, you're sourcing replacement hardware or spare parts on the secondary market under time pressure, often at a premium, instead of opening a Cisco case.
Replacement and Migration Options for the Catalyst 3850
The Catalyst 9300 Is the Named Successor
Cisco's own support documentation points to the Catalyst 9300 series as the platform's forward path, citing improved speed, performance, and security. The swap is not plug-and-play. Validate port counts, PoE budget, uplink types, and stacking behavior against your specific 3850 configuration before ordering.
Power supplies and modules: Both platforms list PWR-C1-1100WAC in their hardware guides, and Cisco documents C3850-NM-4-1G for the 3850 alongside C9300-NM-4G for the 9300. Neither guide confirms these parts transfer between platforms. Treat cross-platform reuse as unverified until you confirm it against your exact PID in writing.
The Licensing Shift You Need to Budget For
Buying new 9300 hardware isn't a one-time purchase anymore. Cisco's ordering guide requires:
- A perpetual Network Stack license (included with hardware)
- A term-based Catalyst or DNA subscription (Essentials or Advantage tier)
- Subscription terms of 3, 5, or 7 years
- A mandatory Smart Account for Smart Licensing
That moves you from the 3850's one-time capital cost to a recurring subscription line item in every refresh budget.
Refurbished Hardware as a Bridge
For teams that need spares, phased migrations, or immediate replacements without new-hardware lead times and licensing overhead, refurbished 3850 or 9300 units are worth considering.
Terabit Systems sells tested, warrantied refurbished Cisco networking hardware. Each unit goes through a five-step QA process:
- Physical inspection
- Functional testing
- Factory reset
- Cosmetic refurbishment
- Final kitting
Coverage includes a one-year replacement-or-refund guarantee. Reach out to confirm current 3850 or 9300 stock and part numbers.
Third-party maintenance is another option if you're not ready to refresh at all — it extends support coverage on your existing 3850s without an immediate hardware swap.
Recovering Value: What to Do With Decommissioned 3850 Switches
Here's the part IT teams often overlook: EOL doesn't mean worthless. The Catalyst 3850 was deployed at massive scale across US campus networks, which keeps secondary-market demand healthy for tested, working units and spare parts.
Instead of letting decommissioned 3850s sit in a closet or pay for e-waste disposal, consider:
- Selling outright for fair-market value on units still in working condition
- Trading in toward a Catalyst 9300 or other refresh purchase
- Recycling responsibly anything with no remaining resale value
Terabit Systems runs a free audit of surplus gear for IT teams weighing this decision. The audit sorts what's still sellable from what should be recycled, and qualifying equipment can convert to a fair-market buy-back or trade-in credit toward replacement hardware—so refresh spend drops instead of retired switches writing off as a total loss.
Frequently Asked Questions
Is the Cisco 3850 end of life?
Copper 3850 models passed their Last Day of Support on October 31, 2025. Fiber/SFP models remain supported until April 30, 2027, so check your exact model number to confirm which timeline applies.
How old are Cisco 3850 switches?
Cisco lists a series release date of January 10, 2013. Given the end-of-sale dates stretching to 2022, the platform is well over a decade old across most deployed units.
What replaced the Cisco Catalyst 3850?
Cisco's documented successor is the Catalyst 9300 series. Some power-supply and module part numbers overlap between platforms, but cross-compatibility isn't officially confirmed, so verify before assuming reuse.
Can I still use a Catalyst 3850 after its end-of-support date?
Yes, it will keep running, but with no security patches, no TAC cases, and no RMA. Third-party maintenance or refurbished spares can bridge the gap while you plan a refresh.
Does EOL Cisco hardware still have resale value?
Yes. Widely deployed models like the 3850 retain solid secondary-market demand, and working units can typically be sold or traded in rather than scrapped. Terabit Systems buys used Cisco gear for fair-market value or trade-in credit through its ITAD buy-back program.
Should I buy new or refurbished when replacing my 3850s?
Refurbished, tested Catalyst hardware costs significantly less and avoids new-equipment lead times and mandatory subscription licensing. Terabit Systems stocks tested units with warranty coverage, which suits phased migrations and budget-constrained refreshes.
