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Cisco Catalyst 9800-40 Wireless Controller (C9800-40-K9) Product Overview
The controller manages up to 2,000 access points and 32,000 concurrent clients while delivering 40 Gbps of sustained forwarding throughput, enabled by a Quantum Flow Processor (QFP) complex that provides hardware-accelerated data plane forwarding and up to 30 Gbps of dedicated security/crypto processing from a modular crypto coprocessor. Four built-in 10G SFP+ ports support Link Aggregation (LAG) for high-density backbone integration, alongside a dedicated 1G management port, RJ-45 and mini-USB console ports, two USB 3.0 ports, and a 240 GB SATA hard drive. Field-replaceable DRAM is upgradable to 32 GB with ECC protection, complemented by a 32 GB internal bootflash module.
IOS XE delivers modular open APIs, model-driven streaming telemetry, and DNA Center integration for policy-based automation at scale, enabling centralised management, seamless roaming, granular application visibility, and comprehensive policy enforcement across both Wi-Fi 6 (802.11ax) and legacy 802.11ac clients. Embedded high availability technologies include Stateful Switchover (SSO), N+1 redundancy, hot-patching, and hitless ISSU software upgrades for maintenance without service disruption. Advanced wireless security features include WPA3, encrypted traffic analytics, integrated threat detection with Cisco Trustworthy Systems, and SD-Access readiness for macro and micro-segmentation.
The C9800-40-K9 series is ideal for midsize enterprise campuses, regional wireless aggregation hubs, and converged SD-Access fabric wireless networks requiring centralised policy enforcement and 40 Gbps of sustained throughput. For large-scale regional hubs and service providers, the 2RU Catalyst 9800-80 provides 80 Gbps throughput with 6,000 AP capacity; for smaller branch sites, the 9800-L offers a compact 5 Gbps alternative.
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