In passive fallback mode for RADIUS, when the primary RADIUS server fails, the controller will start using the secondary RADIUS server. The default timer settings include an inactive timer, which, upon expiration, prompts the controller to attempt to send RADIUS requests back to the primary server. If the primary server is responsive, the controller will resume sending requests to it. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide
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