In a Cisco Connected Mobile Experiences (CMX) high-availability (HA) deployment, a "split-brain" condition occurs when both servers assume the primary role, typically due to a network partition. To recover from this state, the administrator must manually intervene on the server that is intended to be the backup. The correct command to run on this server is cmxha backup convert. This command reverts the node's status from an erroneous primary state back to its designated backup role, allowing it to re-establish communication and synchronization with the legitimate primary server.

A. cmxha convert backup: This is incorrect syntax. The command structure requires the object (backup) to precede the action (convert).

C. cmxha secondary convert: This is incorrect syntax. The command uses the keyword backup, not secondary, and the word order is reversed.

D. cmxha convert secondary: This is incorrect syntax. The command uses the keyword backup, not secondary, for specifying the role conversion.

1. Cisco CMX Configuration Guide

Release 10.6

"Configuring High Availability" chapter

"Recovering from a Split Brain Scenario" section. The guide explicitly states: "To convert the secondary CMX server back to its original state

run the cmxha backup convert command on the secondary CMX server." This confirms the exact command and its purpose in resolving a split-brain issue.