This video provide step by step on how to replace a c9800 faulty unit in an HA-SSO pair without downtime.
Learn more: https://techzone.cisco.com/t5/Unified-Controller-Based-WLC/Replace-c9800-Unit-in-an-Online-HA-SSO-with-no-Downtime/ta-p/10081819
Duration: 00:04:08
Publisher: Cisco
You can watch this video also at the source.
