Problem Description
Onsite dual-link backup networking AP frequently goes offline and quickly comes back online
Process Analysis
dis wlan ap statistics tunnel-down-record check offline reason
insufficient authorization found on site
Solution
From the logs, the general process is that the primary AC has insufficient licenses, causing APs to fail to go online on the primary AC. After going online on the secondary AC, a backup tunnel is established with the primary AC. Due to preemption being configured, after some time, the AP will switchover the primary link to the primary AC. Subsequently, because the number of APs online on the primary AC exceeds the license limit, the AP is forced offline. This process repeats. It is recommended to configure sufficient licenses onsite.8