Due to organizational readdressing requirements, we need to move all of our APs out of the current WLC management vlan. Unfortunately, I cannot simple edit the interface because of redundancy SSO mode enabled. Is there a way to have more than one management interface defined or any other option?
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You are correct, as management or redundancy management interface related details cannot be easily changed on-the-fly once HA-SSO is formed. You will want to scheduled a maintenance window as you will need to disabled HA-SSO, let both WLCs reboot, change the management and redundancy management details, re-enable SSO, then let the WLCs reboot once more as they will then re-form SSO upon powering up.
You can find some additional details here:
Hope that helps!