Smart Licensing, DNA Advantage, and Network Advantage pool-based licensing on the Cisco Catalyst 9800 simplifies tracking but confuses newcomers. A plain-English guide to C9800 licensing, tiers, and SLUP.
Cisco C9800 APs discover, authenticate, and join controllers through a structured multi-phase process. A step-by-step breakdown of the AP join process, DTLS establishment, and operational state transitions for troubleshooting.
CAPWAP is the backbone of every Cisco wireless deployment and most engineers treat it as a black box. Understand how CAPWAP works under the hood on the C9800 so you can troubleshoot faster and design smarter.
The Cisco Catalyst 9800 deploys as physical, virtual, cloud, or embedded, and the choice shapes your operations for years. A plain comparison of C9800 deployment models with the tradeoffs that actually matter.
AireOS ran enterprise wireless for 15 years. The Cisco Catalyst 9800 rebuilds the controller on IOS-XE with a modular architecture and a new configuration model. A side-by-side look at what actually changed and why it matters.
The Cisco C9800 configuration model uses tags, profiles, and policies instead of flat global settings. A clear guide to the five core profiles and how they fit together to drive every AP and WLAN on the controller.
The Cisco Catalyst 9800 is a multiprocess, data-model-driven WLC built on IOS-XE. A deep dive into the hardware and software architecture including processes, dataplane, and fault domains for troubleshooting intelligence.
The Cisco Catalyst 9800 replaces AireOS-based WLCs with a modular IOS-XE platform. A platform overview covering every model, from C9800-L to C9800-CL and embedded, so you can pick the right controller for your deployment.
The Cisco Catalyst 9800 is the current generation of enterprise wireless controllers, built on IOS-XE and designed for Wi-Fi 6, 6E, and 7. A complete reference guide covering models, architecture, config model, and every core feature.
A good VLAN design scales cleanly, keeps STP domains small, and makes troubleshooting obvious. Here is how to plan VLANs for a multi-building campus network.
VLANs provide segmentation, not security. Without explicit hardening — disabling DTP, fixing the native VLAN, enabling DHCP snooping and DAI — your Layer 2 network is wide open to attack.
Inter-VLAN routing failures are usually caused by SVIs in down state, missing routes, DHCP misconfiguration, or ARP timeouts. Learn to diagnose and fix them systematically.