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Implementing and Operating Cisco Enterprise Network Core Technologies (ENCOR) · Cisco
Select one answer.
Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.
In this scenario: A Cisco 5520 HA cluster (SSO) is deployed A Cisco Catalyst 9800 WLC is added and mobility tunnel established Roaming works normally at first After failover of the 5520 (SSO event): WLAN services continue ✅ Inter-controller roaming breaks With SSO (Stateful Switchover) clusters like the 5520: During failover, the active WLC changes If mobility peers (like the 9800) do not recognize the new active unit consistently, roaming fails This is where mobility MAC comes in. You must configure mobility MAC on the 5520 cluster, because: The problem occurs when the 5520 fails over The 5520 HA pair must appear as a single logical mobility entity
Here's why option A is incorrect: The 5520 HA cluster already uses SSO, which means, It operates as a single logical WLC. It automatically shares its mobility MAC between the active and standby units.
The mobility MAC on the 9800 WLC needs to match the 5520 HA cluster to maintain consistent mobility identity for seamless client roaming, especially during failover scenarios where the standby controller becomes active. This ensures uninterrupted mobility sessions as the controllers in the mobility group are recognized by a consistent MAC address.