In this Cisco Tech Talk, we walk through the essential pre-upgrade readiness checklist for performing an In-Service Software Upgrade (ISSU) on the Cisco Catalyst 9800 Series Wireless LAN Controller (WLC). Preparing your WLC properly before initiating an ISSU is critical to avoiding unexpected downtime, errors, and failed upgrades. This video outlines all the key checks and validations you should complete beforehand to ensure a successful and seamless ISSU. Related links: Cisco Catalyst 9800 WLC Overview → ISSU Configuration Guide for C9800 → What you’ll learn in this video: – Which pre-checks to complete before starting an ISSU on a C9800 WLC – How to validate system compatibility, redundancy, and licenses – How to reduce upgrade risk and ensure controller uptime A well-prepared ISSU process starts long before the upgrade begins. Use this checklist to ensure your controller is fully ready, supported, and protected. Learn more: Cisco Official Site → Cisco Products & Services → Cisco Solutions → Contact Us → Follow Us on Social Media: Cisco LinkedIn → Cisco Twitter → Cisco Instagram → Cisco Facebook → Got questions or insights? Drop them in the comments—we'd love to hear from you! Don’t forget to like, subscribe, and hit the bell icon to stay updated on the latest with Cisco. #Cisco #Catalyst9800 #WLC #ISSU #WirelessController #CiscoTechTalk #PreUpgradeChecklist #WirelessNetworking"