Cisco Catalyst 9800-40-K9 Wireless Controller

The Cisco Catalyst 9800-40 (C9800-40-K9) is a 1RU wireless LAN controller for intent-based networking, running Cisco IOS XE. Designed for medium to large enterprises, it delivers 40 Gbps throughput, supports up to 2,000 access points and 32,000 clients, and features 4 x 10G SFP+ ports with redundant power.

Key Capabilities

Performance: 40 Gbps sustained forwarding, 32 GB DDR3 ECC memory, 240 GB storage.

High Availability: Stateful Switchover (SSO), N+1 redundancy, hot/cold patching for seamless updates.

Security: WPA3, Encrypted Traffic Analytics (ETA), SD-Access Fabric Mode, Secure Boot, and Trustworthy Solutions.

Hardware Specifications

Deployment & Management

• Modes: Centralized, FlexConnect, Fabric (SD-Access), Mesh

• Management: Cisco DNA Center, Prime Infrastructure, NETCONF/RESTCONF, YANG, streaming telemetry, CLI, web UI

• Standards: 802.11ax (Wi-Fi 6), backward compatible

Use Cases

• Enterprise campuses with up to 2,000 APs / 32,000 clients

• High-availability environments requiring SSO

• SD-Access policy-based segmentation

• Branch offices with FlexConnect local switching

Ordering Information

• Base SKU: C9800-40-K9 (ships with one AC power supply)

• Optional License: LIC-C9800-DTLS-K9

• Smart Licensing: Capacity-based

Migration Path

Replace with CW9800M Series – same 1RU form factor, IOS XE software (no retraining), lower power consumption, enhanced performance.