Refer to the exhibit. An engineer is troubleshooting operational performance in the network. Which action should be taken to restore high availability in this subcluster?

Question

Exhibit

Options

• AGo to "Presence Redundancy Group Configuration" on the Cisco UCM Administration page and
• BGo to "Presence User Assignment" on the Cisco UCM Administration page and select "rebalance
• CStart all critical services on the second node, and select the Fallback button in the "Presence
• DStart all critical services on both nodes and select "rebalance users" in the "Presence User

• A
  3% (1)
• B
  16% (6)
• C
  74% (28)
• D
  8% (3)

Explanation

When an IM and Presence subcluster has failed over to the backup node (the secondary node is 'running in backup mode'), the correct recovery procedure is: (1) ensure all critical IM and Presence services are running on the second (backup) node, then (2) click the Fallback button in the Presence Redundancy Group configuration page on Cisco UCM Administration. The Fallback button triggers a controlled return of users to the primary node. Simply rebalancing users (choice B or D) does not restore the primary node's operational state, and modifying the Presence Redundancy Group configuration alone (choice A) without first ensuring services are running and clicking Fallback will not complete the HA restoration.

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