Catalyst 3850 vs 9300: Should You Upgrade? (2026)

Aug 11 , 2026 5

TL;DR: The Catalyst 3850 was Cisco's flagship stackable access switch from 2013; the Catalyst 9300 is its modern successor. Both are 1G/10G access platforms, but the 9300 adds UADP 2.0, modular uplinks, higher PoE (UPOE+), and modern IOS-XE security. If you own a 3850 fleet, the 9300 is the natural upgrade — and tested pre-owned makes it affordable.

Catalyst 3850 vs 9300: At a Glance

What You Gain Moving 3850 to 9300

For most teams the 3850 is "good enough" — and it is. But three things push a migration: the 3850's end-of-life clock, UADP 2.0 features (better mGig support, newer feature sets), and UPOE+ for power-hungry endpoints like Cisco phones and APs. The 9300's modular uplink slots are the biggest practical difference — you can add 25G or mGig uplinks later instead of replacing the whole unit.

Stacking is identical (StackWise-480), so a mixed 3850/9300 stack during migration is possible in some designs — but Cisco recommends testing inter-generation stacking carefully, and most teams prefer to migrate stack-by-stack.

Price Reality: Pre-Owned Changes the Math

New 9300s are significantly more expensive than 3850s were. Tested pre-owned 9300s close much of that gap — often landing near or below what a used 3850 costs, while delivering the modern platform. If you are already buying pre-owned 3850s for expansion, compare against pre-owned 9300s; the delta is often small enough that the newer platform wins on lifecycle alone.

How to Choose

3850 fleet in production, budget limited? → Start migrating access stacks to tested pre-owned 9300s, site by site. Keep 3850s in non-critical roles until the migration completes.

Need UPOE+, mGig, or 25G uplinks? → 9300 is the only choice in this pair. The 3850 cannot do UPOE+ or mGig at scale.

Expanding an existing 3850 network? → Buying used 3850s extends a platform approaching EOL. Unless the price is dramatically lower, prefer the 9300 to avoid buying into a sunset.

FAQ

Q: Is the Catalyst 3850 end-of-life?

A: Yes — Cisco has announced end-of-life for the 3850 series. Check the specific model's EOL bulletin for last-support dates and plan accordingly.

Q: Can 3850 and 9300 stack together?

A: Mixed-stack support exists in some IOS-XE versions but is not recommended for production without testing. Most teams migrate entire stacks rather than mixing generations.

Q>Is the 9300 worth it over a used 3850?

A: For production, usually yes: the 9300 buys lifecycle runway, UPOE+, modular uplinks, and modern security. Tested pre-owned pricing makes the delta smaller than most expect.

Quote Your 3850-to-9300 Migration

LinkNewNet stocks tested pre-owned Catalyst 9300 access switches and the modules to match your uplink needs. Tell us your 3850 stack sizes and PoE requirements for a phased migration quote.