350-801 · Question #483
An engineer is trying to add a new subscriber to the cluster of Cisco UCM, and the synchronization is failing. The engineer obtained the output from the publisher and noticed the error. Based on the…
The correct answer is C. The NTP server must be replaced by another server with NTP stratum 1, 2, or 3 running version. When adding a subscriber to a Cisco UCM cluster, synchronization can fail due to an invalid NTP source. Cisco UCM requires an NTP server with a stratum level of 1, 2, or 3 to ensure accurate and reliable time synchronization across the cluster for proper operation.
Question
An engineer is trying to add a new subscriber to the cluster of Cisco UCM, and the synchronization is failing. The engineer obtained the output from the publisher and noticed the error. Based on the output, what is the issue?
Exhibit
Options
- AThe NTP server is running out of space in the hard drive, which prevents the cluster service from
- BThe NTP service is pointing to the wrong publisher.
- CThe NTP server must be replaced by another server with NTP stratum 1, 2, or 3 running version
- DThe NTP server for Cisco UCM must be stratum 6 or higher.
How the community answered
(30 responses)- A13% (4)
- B3% (1)
- C77% (23)
- D7% (2)
Why each option
When adding a subscriber to a Cisco UCM cluster, synchronization can fail due to an invalid NTP source. Cisco UCM requires an NTP server with a stratum level of 1, 2, or 3 to ensure accurate and reliable time synchronization across the cluster for proper operation.
An NTP server running out of hard drive space is not a typical reason for NTP synchronization failure in a UCM cluster and is unrelated to the stratum level, which is a common cause of such issues.
While an NTP service pointing to the wrong publisher could cause time synchronization problems, the question implies an error related to the NTP server itself (likely stratum or version issues) rather than just misconfiguration.
Cisco UCM requires an NTP server of stratum 1, 2, or 3 for reliable time synchronization across the cluster. If the NTP server is of a higher stratum (e.g., 4 or higher), it is considered less reliable, and synchronization issues or failures may occur, particularly when adding new nodes. Replacing the NTP server with one that meets the stratum requirement is essential for successful cluster operations.
Cisco UCM explicitly requires NTP servers to be stratum 1, 2, or 3, not stratum 6 or higher; stratum 6 or higher would indicate a less accurate time source and is not supported for cluster synchronization.
Concept tested: Cisco UCM NTP Stratum Requirements
Source: https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/install/12_0_1/cucm_b_install-guide-cucm-1201/cucm_b_install-guide-cucm-1201_chapter_0110.html#task_AB0D95A720D9BA112C7859871329EF50
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