A company has an existing Cisco 5520 HA cluster using SSO. An engineer deploys a new single Cisco Catalyst 9800 WLC to test new features. The engineer successfully configures a mobility tunnel between the 5520 cluster and 9800 WLC. Clients connected to the corporate WLAN roam seamlessly between access points on the 5520 and 9800 WLC. After a failure on the primary 5520 WLC, all WLAN services remain functional; however clients cannot roam between the 5520 and 9800 controllers without dropping their connection. Which feature must be configured to remedy the issue?

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B. mobility MAC on the 9800 WLC When the primary 5520 WLC fails and the secondary takes over, the 9800 WLC must be configured with the mobility MAC address of the secondary 5520 WLC to correctly establish a mobility tunnel to the new active controller, enabling seamless roaming post-failover.

Answer

A. mobility MAC on the 5520 cluster Configuring the mobility MAC on the 5520 cluster itself is not the corrective action from the perspective of the 9800 WLC needing to recognize the failover target.

Answer

C. new mobility on the 5520 cluster New mobility is the feature that allows communication, and the question states it was successfully configured, meaning the fundamental feature is in place but a specific configuration for HA is missing.

Answer

D. new mobility on the 9800 WLC New mobility is configured on the 9800 WLC, but the specific problem after failover points to a missing peer entry for the secondary WLC's MAC, not a complete lack of new mobility on the 9800.

A company has an existing Cisco 5520 HA cluster using SSO. An engineer deploys a new single Cisco Catalyst 9800 WLC to test new features. The engineer successfully configures a mobility tunnel between

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