350-801 · Question #317
Which configuration concept allows for high-availability on IM and Presence services in a UC environment?
The correct answer is D. Presence Redundancy Groups (configured on Cisco UCM). Presence Redundancy Groups (PRGs) are the HA mechanism for Cisco Unified IM and Presence Service, but critically, they are configured from within Cisco Unified Communications Manager (UCM) administration - not from the IM and Presence admin interface itself. Each PRG pairs two…
Question
Which configuration concept allows for high-availability on IM and Presence services in a UC environment?
Options
- AIM and Presence subclusters (configured on Cisco UCM)
- BPresence Redundancy Groups (configured on Cisco Unified IM and Presence)
- CIM and Presence subclusters (configured on Cisco Unified IM and Presence)
- DPresence Redundancy Groups (configured on Cisco UCM)
How the community answered
(37 responses)- A3% (1)
- B3% (1)
- C5% (2)
- D89% (33)
Explanation
Presence Redundancy Groups (PRGs) are the HA mechanism for Cisco Unified IM and Presence Service, but critically, they are configured from within Cisco Unified Communications Manager (UCM) administration - not from the IM and Presence admin interface itself. Each PRG pairs two IM and Presence nodes (primary and backup). If the primary node fails, users fail over to the backup. This is a common exam trap: administrators expect HA to be configured on the IM&P server, but the PRG configuration lives in UCM. 'Subclusters' is a real concept but refers to grouping IM&P nodes for scalability, not HA failover.
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