Cisco 9800 Wireless 2025 – High Availability Upgrade to 17.12.04 – GUI In-Service Software Upgrade (ISSU)

The Cisco Catalyst 9800 wireless controller can be upgraded using a variety of methods, including:

  • Software Maintenance Upgrade (SMU): Installs a software package to fix bugs or provide security updates 
  • Hitless Upgrade: Upgrades APs in stages while they remain connected to the controller. 
  • Software Maintenance Upgrade (SMU): This method is used to fix bugs or provide security updates. 
  • Hitless Upgrade: This method allows APs to be upgraded in stages while they remain connected to the controller. 
  • In-Service Software Upgrade (ISSU): Upgrades a wireless controller image to a newer release while the network continues to function.This method is ideal for 24/7 environments because it minimizes downtime. It can also be used to apply cold patches without impacting the active network. 

Verify the that the devices are in HA/SSO mode

Log into the GUI of the primary 9800

The device will reboot and reinitialize HA

Verify that both devices were successfully upgraded

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.