A customer has a pair of Cisco 5520 WLCs set up in an SSO cluster to manage all APs. Guest traffic is anchored to a Cisco 3504 WLC located in a DMZ. Which action is needed to ensure that the EoIP tunnel remains in an UP state in the event of failover on the SSO cluster?
In a setup where Cisco Wireless LAN Controllers (WLCs) are in a High Availability (HA) configuration with Stateful Switch Over (SSO), the mobility traffic, including EoIP (Ethernet over IP) tunnels, relies on a consistent mobility peer relationship. Using the mobility MAC when the mobility peer is configured ensures that both WLCs in the failover pair share a unique MAC address for mobility, which keeps the EoIP tunnel active even in case of a failover. This consistent identity across failovers maintains the tunnel's integrity and continuity.
https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/7-5/High_Availability_DG.html#:~:text=The%20Primary%20units,cannot%20be%20changed.
Answer D : https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/7-5/High_Availability_DG.html
Mobility MAC Unique MAC address shared between peers in HA setup. This mac address should be used to form a mobility pair between HA setup and another WLCs in HA setup or with independent controllers.
D is correct