Cisco Catalyst 3850 vs 9300: Which Should You Buy

Aug 10 , 2026 4

TL;DR: The Catalyst 9300 is the current generation: newer IOS-XE, higher PoE, better stack throughput and an active lifecycle. The Catalyst 3850 is the previous generation: still a workhorse, much cheaper on the used market, but EOL has been announced. Choose 9300 for permanent builds; 3850 for budget access or lab duty.

The Two Generations at a Glance

Both families support 24 and 48-port models with 1G SFP/SFP+ uplinks and modular uplink options, so migration between them is behaviorally painless — the CLI and management model carry over.

Performance and Stacking

Stack throughput tells the story of the platform generation. The 3850 uses StackWise-480, which was excellent in its day; the 9300 pushes similar or better fabric bandwidth with faster per-switch ASICs. For access closets running heavy east-west traffic (voice, video, backups between stacks), the 9300 stacks sustain more load without drops.

PoE and Device Power

This is the line that decides many purchases. The 3850 delivers PoE+ at 30W per port; the 9300 family adds PoE++ options at up to 60W, which powers Wi-Fi 6 access points, high-end cameras and thin clients without per-port budgeting. If your next refresh includes modern APs, the 9300's power headroom removes the upgrade problem before it starts.

Software and Security Features

The 9300 runs the current IOS-XE releases and inherits features like encrypted traffic analytics, TrustSec enhancements and the latest switch security fixes. The 3850 sits on an older train: still functional, but it will not receive the newest feature and security updates as its EOL milestones pass. On segmented networks this is a planning factor; on flat networks it is mostly theoretical.

Modules and Uplinks

Each family uses its own network modules. On the used market you will see C3850-NM-4-10G and C3850-NM-2-10G uplink modules for the 3850, and C9300-NM-* modules for the 9300 — they are not interchangeable. When buying used, check that the module generation matches the chassis.

Buying Advice for Both

• Choose the 9300 when the switch has a multi-year role: access stacks, distribution, anything carrying security-sensitive traffic. A used C9300-24U-E or 48U delivers current-generation hardware at a fraction of list price.
• Choose the 3850 when price dominates and the role is defined: lab, DR, guest segments, short-term expansion of an existing 3850 fleet. A used WS-C3850-24P-E is one of the best price-performance access switches on the secondary market.
• Never mix the families in one stack — plan migration as stack-by-stack replacement.

For the wider 3850 lifecycle context, see our Catalyst 3750 and 3850 upgrade guide, and compare the 9300 against its smaller sibling in the Catalyst 9200 vs 9300 comparison. Full availability of both families is in our pre-owned Catalyst switch catalog.

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: Which is better, Catalyst 3850 or 9300?

A: For new purchases, the 9300. It runs the current IOS-XE releases with full security features, has higher PoE budgets and better stack throughput. The 3850 is the older generation: capable, cheaper used, but moving toward end of life.

Q: Is the Catalyst 3850 end of life?

A: Yes, the 3850 family has been announced end of life, with end-of-sale already passed and end-of-support approaching. Used 3850s remain excellent value for labs and transitional roles.

Q: Can I stack 3850 and 9300 switches together?

A: No. The two families use different stack architectures and cannot form a single stack. Plan migration as whole-stack replacements rather than mixing units.

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

A: The 9300 delivers higher PoE budgets per switch and supports more power-hungry devices per port, which matters for Wi-Fi 6 APs and cameras. The 3850-24P/48P models deliver PoE+ at lower budgets.

Q: Are Catalyst 9300 modules compatible with 3850?

A: No. The 9300 uses its own network modules (C9300-NM-*); 3850 modules such as C3850-NM-4-10G are specific to the 3850 chassis.

Q: What should I buy used: 3850 or 9300?

A: For permanent roles, 9300. For budgets that will not stretch, a tested 3850 with a warranty is still a strong access switch — just plan the eventual migration to 9300.

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