Refer to the exhibit. An enterprise is using wireless as the main network connectivity for clients. To ensure service continuity, a pair of controllers will be installed in a datacenter. An engineer is designing SSO on the pair of controllers. What needs to be included in the design to avoid having the secondary controller go into maintenance mode?
A. The redundancy port must be the same subnet as the redundancy mgmt.
B. The keep alive timer is too low, which causes synchronization problems.
C. The connection between the redundancy ports is missing.
D. The Global Configuration of SSO is set to Disabled on the controller.
The answer is C.
‘There are few scenarios where the Standby WLC may go into Maintenance Mode and not be able to communicate with the network and peer:
• Non reachability to Gateway via Redundant Management Interface
• WLC with HA SKU which had never discovered peer
• Redundant Port is down
• Software version mismatch (WLC which boots up first goes into active mode and the other WLC in Maintenance Mode)’
High Availability (SSO) Deployment Guide – Cisco