Enterprise Wi-Fi on Cisco Catalyst 9800, the WLC platform that replaced the AireOS generation. Articles tagged Wireless cover the configuration model, AP join, WPA3, FlexConnect, RRM, fast roaming, SSO HA, and IOS XE troubleshooting.
The 9800-CL in CML will never show a joined AP, and it is not your config. Real IOS XE 17.18.2 output shows exactly what a virtual wireless controller can and cannot do, so you spend study time on the parts that actually work.
A wireless LAN controller turns a pile of access points into a managed network: the APs become radios and the WLC becomes the brain. Covers the problem it solves, the controller-and-AP split, and WLC form factors.
Every Cisco AP mode explained: Local, FlexConnect, Monitor, Sniffer, Rogue Detector, SE-Connect, Bridge and Mesh. What each does and when to use it.
Part 2 of the 9800 Wireless Labs: bring up the wired underlay, then walk the 9800-CL through Day 0 line by line: wireless management interface, country code, admin access, and the self-signed certificate every AP join depends on. Captured live.
Part 1 of the PingLabz 9800 Wireless Labs: build a Catalyst 9800-CL topology in Cisco Modeling Labs from an empty canvas, with a small wired campus underneath and a bridge to a physical network.
Wi-Fi 7 is shipping and Cisco has a full 802.11be AP lineup, but the real question is whether your environment, wiring, and refresh timing justify the spend now. A practical upgrade decision guide for wireless architects.
Backup, restore, and upgrade on the Cisco C9800 look simple until they are not. A full lifecycle walkthrough with Install mode, ISSU, SMU, N+1 rolling upgrades, and the gotchas that never fit on a GUI tooltip.
In an SD-Access fabric, the Cisco C9800 stops being the wireless data-plane anchor. Client traffic rides the VXLAN overlay from fabric-enabled AP to edge switch. Here is how fabric-mode wireless actually works and why you would adopt it.
Local mode and FlexConnect are the two fundamental ways a C9800 hands off client traffic, and the wrong choice shapes WAN use, failure behavior, VLANs, ACLs, and AAA. A per-site decision framework for wireless designers.
RF punishes shortcuts. Bad AP count, wrong channel plan, or a misjudged power envelope will haunt a wireless design for years. A practical Cisco C9800 RF design guide covering site survey, channel planning, and 2.4, 5, and 6 GHz power tuning.
A working Cisco Catalyst 9800 deployment and a good one are very different things. This guide pulls together the design decisions that matter most, platform, HA, tags, RF, security, and upgrades, with the CLI to validate each.