11-27-2013 08:04 PM - edited 03-16-2019 08:37 PM
Hi folks,
I've been trying to find out what the expected behaviour is for CUCM NTP in the event that the Publisher goes down and am not having any luck.
As the Publisher looks to the NTP server for time and the Sub looks to the Publisher for time, what happens when the Publisher is unavailable?
Does the Subscriber pick up the role of the Publisher and then look to the external source for NTP?
Cheers,
Brett
Solved! Go to Solution.
11-28-2013 07:19 AM
No, time will simply be no longer synchronized and may or may not be slightly off.
HTH,
Chris
11-28-2013 12:00 PM
Hello Brett,
On the screenshot below you will see the output of the command 'utils ntp status' in a cluster lab of how the NTP status of the Subscriber server is when the Pub (192.168.1.120) goes down, usually when NTP is synched you will find that the reference id is the ip address of what was configured initially in the publisher as the NTP source as for example an NTP public address. As you can notice it remains in the state of .INIT. which means initialization has not yet succeeded.
Regards,
- |)avi|)
11-29-2013 07:20 AM
Time will simply follow whatever is pulled from the Sub (SCCP phones) which may be slightly off. SIP phones pull the time from NTP references, which is typically pointed to the same NTP source as the PUB so I would assume is unavailable as well, whch means time might be off as well.
Chris
11-28-2013 07:19 AM
No, time will simply be no longer synchronized and may or may not be slightly off.
HTH,
Chris
11-28-2013 08:06 PM
Thanks Chris, rating given.
11-28-2013 12:00 PM
Hello Brett,
On the screenshot below you will see the output of the command 'utils ntp status' in a cluster lab of how the NTP status of the Subscriber server is when the Pub (192.168.1.120) goes down, usually when NTP is synched you will find that the reference id is the ip address of what was configured initially in the publisher as the NTP source as for example an NTP public address. As you can notice it remains in the state of .INIT. which means initialization has not yet succeeded.
Regards,
- |)avi|)
11-28-2013 08:06 PM
Thanks David, rating given.
11-29-2013 02:00 AM
+5 to David and Chris..One thing I am curious to know is this: What happens to the time on the IP phones in a situation where the subscriber time is unsynchronized due to the publisher unavailability?
Please rate all useful posts
"opportunity is a haughty goddess who waste no time with those who are unprepared"
11-29-2013 07:20 AM
Time will simply follow whatever is pulled from the Sub (SCCP phones) which may be slightly off. SIP phones pull the time from NTP references, which is typically pointed to the same NTP source as the PUB so I would assume is unavailable as well, whch means time might be off as well.
Chris
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide