In-depth tutorials on OSPF, BGP, 802.1X, and more- for engineers who want to understand the why, not just the how.
Open Shortest Path First tutorials covering LSA types, area design, neighbor states, route summarization, authentication, and OSPF tuning for enterprise and service provider networks.
31 posts
Border Gateway Protocol tutorials covering eBGP, iBGP, path selection, route filtering, communities, and BGP design for enterprise and service provider networks.
30 posts
802.1X port-based network access control tutorials covering EAP methods, RADIUS integration, MAB, dynamic VLAN assignment, and Cisco ISE deployment for wired and wireless environments.
31 posts
The Catalyst 9800 makes backup, restore, and upgrade look simpler than it actually is. The commands are short, the GUI has wizards, and most of the time the process works. The trouble starts on the 2 percent of upgrades that
SD-Access wireless on the Cisco Catalyst 9800 is one of those topics that looks complicated from the outside and becomes straightforward once you understand the mental model. The short version is: in a Software-Defined Access (SD-Access) fabric, the C9800 stops
Local mode and FlexConnect are the two fundamental ways a Cisco Catalyst 9800 can hand off client traffic, and the choice shapes almost everything else in your design — WAN utilisation, failure behaviour during a controller outage, the identity of the
RF is the part of a wireless deployment that punishes shortcuts. You can mis-tag APs and fix it in an hour. You can pick the wrong HA model and swap it in a maintenance window. But an RF design built
A working Catalyst 9800 deployment and a good Catalyst 9800 deployment are two very different things. The platform is forgiving — you can mis-tag APs, leave RRM on defaults, skip SSO, and the WLAN will still serve clients. The problem shows
C9800 NETCONF and RESTCONF: Automation and Programmability The Catalyst 9800 wireless LAN controller represents a shift toward model-driven programmability, moving beyond traditional CLI-based management. This article explores how you can leverage NETCONF and RESTCONF protocols to automate configuration, retrieve operational
C9800 Model-Driven Telemetry: Streaming Wireless Data with YANG and gRPC You're managing a large Cisco Catalyst 9800 wireless deployment. Everything runs smoothly, but you need deeper operational insights. You want to monitor client join times, track access point
Why CleanAir and Spectrum Intelligence Matter When you operate a wireless network—especially one covering challenging environments—you're working in unlicensed spectrum. Wi-Fi is fundamentally a free-for-all medium where every device must follow the same basic rules: listen
C9800 Rogue AP Detection, WIPS, and Client Exclusion Your wireless network is under constant threat. Every day, attackers deploy rogue access points in range of your corporate APs, capturing credentials, launching man-in-the-middle attacks, and exfiltrating sensitive data. The Cisco Catalyst
C9800 Wireless Security Deep Dive: WPA3, iPSK, and Enhanced Open You're deploying wireless networks in enterprises where security breaches cost millions in downtime and compliance violations. The Cisco Catalyst 9800 Series Wireless Controller gives you the tools to
Wi-Fi 6 and Wi-Fi 6E on the Cisco Catalyst 9800 Wi-Fi 6 (802.11ax) represents a fundamental shift in wireless technology, delivering significant performance improvements over previous generations. When you deploy the Cisco Catalyst 9800, you gain access to enterprise-grade
C9800 Radio Resource Management (RRM) Deep Dive C9800 Radio Resource Management (RRM) Deep Dive Why RRM Matters: The Foundation of Enterprise Wireless You're managing a Cisco Catalyst 9800 wireless network, and you've deployed access points across