Enable Console Access to Standby 9800 WLC
Once HA is enabled and one of the boxes is assigned as active and the other one as standby hot, by default it is not allowed to reach exec mode (enable) on the standby box.
To enable it, login by SSH/console to the active 9800 WLC and enter these commands:
# config t
# redundancy
# main-cpu
# standby console enable
# end
https://www.cisco.com/c/en/us/support/docs/wireless/catalyst-9800-series-wireless-controllers/213915-configure-catalyst-9800-wireless-control.html
And you can connect to the standby controller through SSH using the RMI IP of the standby controller. The user credentials must have been configured already. Both local authentication and RADIUS authentication are supported.
https://www.cisco.com/c/en/us/td/docs/wireless/controller/9800/17-9/config-guide/b_wl_17_9_cg/m_vewlc_high_availability.html
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