A new Catalyst 9800 pair never shows the standby ready. The redundancy link between the two controllers is down, and the WLANs are already configured. What has to be repaired first?
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Short Explanation
The two controllers cannot compare notes if the link between them is down. Your WLANs can be perfect and the standby still will not become ready. Fix that redundancy link before you rename a guest network.
Full Explanation
Stateful switchover depends on a working redundancy link so the standby controller can synchronize state and reach a ready condition. If that link is down, the pair never becomes a real pair, no matter how complete the WLANs are. Repairing the redundancy link is the first fix. The guest SSID name is a client-facing label. The standby does not read it as a prerequisite for synchronization, and renaming it leaves the link down. The mandatory data rate is a radio setting for clients. It does not have to be zero for SSO, and zeroing it would only shrink or break client service. The beacon interval is an over-the-air timer on access points. It is not the heartbeat on the redundancy link between controllers. Exam caveat: a link that is up at layer 1 can still fail if the addresses or the VLAN on that link are wrong. Up on the switch is not the same as the pair showing standby ready. Operational check: restore the redundancy link, confirm it passes traffic, and wait until the pair reports the standby ready before you test a failover.