Cisco Catalyst 9400 Switches

How to choose a Cisco Catalyst 9400 switch

The Catalyst 9400 is Cisco’s modular supervisor-and-line-card family on IOS XE—not a fixed Catalyst 9500 core/aggregation switch and not a stackable Catalyst 9300/9200 access platform. Buy it when you need dual-supervisor high availability, field-replaceable copper/fiber/mGig PoE cards, and closet-friendly ~16-inch depth with side-to-side airflow. Start with chassis slot count and rack units, then lock the supervisor bandwidth, line-card media, PoE budget, and Cisco Networking Subscription tier (Switching Essentials or Switching Advantage) before you submit the RFQ.

1. Match chassis size to port scale and rack space

Cisco documents three chassis. C9404R is the compact four-slot unit: two line-card slots, two dedicated supervisor slots, up to 96 front-panel ports, four power-supply bays, and 6 RU. Use it for small MDFs, branch distribution, or any site that still wants modular HA without a 10 RU footprint. The seven-slot C9407R= (new spare) and C9407R-RF (refurbished) remain the workhorse mid-density choices: five line-card slots, up to 240 ports, eight PSU bays, and 10 RU. For the largest modular access or distribution nodes, quote C9410R-RF—eight line-card slots, up to 384 ports, eight PSU bays, and 13 RU. Supervisor slot numbers are fixed (9404: 2–3; 9407: 3–4; 9410: 5–6); never install line cards in supervisor slots. Prefer Cisco datasheet RU and port ceilings over marketplace shorthand.

2. Add the right line cards and correct marketplace titles

C9400-LC-24S is a 24-port 1 Gigabit Ethernet SFP line card (IOS XE 16.8.1 or later). Site titles that say “10G SFP+” are incorrect—the 10G SFP+ card is C9400-LC-24XS, Cisco’s 24-port 10 Gigabit Ethernet SFP+ line card (IOS XE 16.6.2 or later), which we list separately. Use LC-24S for fiber-to-the-desktop, 1G fiber aggregation, or non-blocking 1G SFP density as you fill a 9404/9407/9410 chassis. C9400-LC-48HN delivers 48 RJ-45 ports at 5G/2.5G multigigabit (with 1G/100M fallback) and Cisco UPOE+ up to 90W per port for Wi-Fi 6/6E access points, PTZ cameras, and other high-power endpoints. It is not a wireless AP SKU and not the 10G mGig UPOE+ card (C9400-LC-48HX). For a 96-port 1G UPOE starting point on a 9407 chassis, review C9407R-96U-BNDL-A (commonly chassis + supervisor + two C9400-LC-48U cards + Switching Advantage–tier licensing) and confirm the exact supervisor revision, subscription term, and power-supply count on the RFQ—do not assume “Layer 2 only” marketplace wording describes the full Catalyst 9400 feature set.

3. Plan supervisors, power, licensing, and high availability

Chassis-only PIDs do not forward packets by themselves. You still need at least one supervisor (SUP-1, SUP-1XL, SUP-1XL-Y, or SUP-2/2XL), the matching fan tray, and enough 2100W or 3200W AC (or DC) supplies for N+1 or N+N operation under your PoE load. Cisco rates bandwidth per line-card slot from 80 Gbps with SUP-1 up to 480 Gbps/slot with C9400X-SUP-2XL on all three chassis; marketplace claims of “480 Gbps” without a SUP PID are incomplete. Dual supervisors enable SSO/NSF and ISSU-style upgrades. StackWise Virtual can pair two chassis into one logical system—plan identical software trains, SVL optics, and Advantage-tier entitlements. License through the Cisco Networking Subscription (Switching Essentials or Switching Advantage); legacy units may carry perpetual Network Essentials/Advantage with a matching Cisco DNA term. On every refurbished (-RF) unit confirm Smart Account transfer before cutover.

4. Finish the BOM and related series

Complete optics from Transceivers, fiber or copper assemblies from Network Cables, and redundant modules from Cisco Power Supplies.

Stay modular with this 9400 category; move to fixed high-speed core/aggregation on Catalyst 9500; deploy stackable access and UPOE with Catalyst 9300 or cost-optimized Catalyst 9200.

Cross-check series selection in the Cisco Switch Buying Guide.

Cisco Catalyst 9400 Switch FAQs