🔀 Cisco Catalyst 9300 vs 9400 vs 9500

These three Catalysts are not really competitors — they are three layers of the same campus reference architecture, and the right choice depends on where the switch sits, not which is "best". The 9300-48T is a fixed 1U access switch with 48 gigabit RJ45 ports and 10G SFP+ uplinks, designed to live in a wiring closet and stack with StackWise-480 at 480 Gbps. The 9400 is a modular chassis with redundant supervisors and up to 25.6 Tbps of capacity, built for distribution or collapsed core in large campuses where you cannot tolerate a planned outage. The 9500-32C is a fixed 1U core with 32 × 100G QSFP28 ports and 6.4 Tbps non-blocking — the densest 100G of the three and the one that bridges campus into data-centre aggregation.

Where they differ in substance: the 9500-32C uses the newer UADP 3.0 ASIC and is the only one that delivers true 100G line-rate at this density, making it the natural SD-Access border or fabric control-plane node. The 9400 wins on resilience and PoE — dual supervisors, hot-swap line cards, and up to 2,880W of UPOE+ per slot for powering APs, cameras and desk phones at scale; nothing in the 9300 or 9500 line matches that physical redundancy. The 9300-48T is the cheapest per port and the most flexible to deploy, but the -T variant specifically has no PoE, which rules it out for any closet that also feeds wireless or telephony — buyers in that situation should be looking at the -48P, -48U or -48UXM SKUs instead.

For UK buyers the licensing model is the same across all three (DNA / Catalyst Center Essentials or Advantage subscription), so the TCO conversation is really about chassis cost, PoE budget, and how many years of subscription you commit to. NCSC-aligned campuses running SD-Access and TrustSec will get equivalent security posture from any of the three — MACsec is on all ports of the 9300-48T and 9500-32C, and on capable line cards in the 9400.

Recommendation framework: if you are refreshing wiring closets and don't need PoE on this particular run, the 9300-48T is the right answer; if you need PoE, pick a different 9300 SKU. If you are replacing an ageing 6500/6800 distribution layer in a large campus — university, hospital trust, council HQ — and you need supervisor redundancy and high PoE density, the 9400 is the only one of the three that fits. If you are building a new SD-Access fabric border, collapsing core and aggregation into 1U, or terminating 100G uplinks from a data centre, the 9500-32C is the cleaner choice.

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