05-05-2016 01:19 AM - edited 03-19-2019 11:04 AM
Hello guys,
During a migration for our CUCM (9 nodes) + 2 IMP, we encountered some failures in the process with NTP check step.
Our NTP server was stratum 6 instead of recommended stratum 1 to 3 for the nodes.
I want to change the stratum, but, If I change my ntp server, I need to reboot all the nodes according to the cisco documentation
-> don´t want that
Second plan : I can change the actual stratum for the actual NTP server (2 cisco GW) in changing the NTP server by an external.
Question : does I need to reboot if my NTP server change it stratum ?
Any advices ?
Thanks in advance
Solved! Go to Solution.
05-05-2016 02:02 AM
Hi Kevin,
You are right , the documentation does point to a cluster reboot after NTP change. So i would recommend doing it in a maintenance window.
Manish
05-05-2016 01:33 AM
CUCM server restart is not needed when you add / delete or modify NTP server information. Just update the NTP information and do a "utils ntp restart" and it should be good enough to synsc cucm with correct NTP. We recommend that the NTP for the publisher is set to stratum 1, 2, or 3, and that you use only a Linux or IOS NTP source. Windows Time Services as an NTP server is not recommended or supported.
Manish
05-05-2016 01:48 AM
Thanks for your response.
However, according this OS guide, it is mandatory to reboot all the nodes
But if you confirm me, it will be good if I change the stratum on my current NTP server, I will do that
05-05-2016 02:02 AM
Hi Kevin,
You are right , the documentation does point to a cluster reboot after NTP change. So i would recommend doing it in a maintenance window.
Manish
05-05-2016 02:09 AM
Thanks for your assistance
05-05-2016 02:51 AM
[+5] to Manish.
I faced this issue where in I had to delete NTP server and then, add new NTP server in CUCM.
SO, you need to have at least one NTP server defined else u won't be able to delete the existing one.
Also, the new NTP server should be reachable. If not, u won't be able to add that.
Lastly, no reboot of CUCM is required when NTP is changed.
regds,
aman
05-05-2016 02:56 AM
Hi Aman,
To be honest even i don't remember rebooting cluster after changing NTP and i have done it N number of times. However, i am a bit surprised by this documentation, maybe if Kevin can open a TAC case to get it confirmed and possibly get a documentation defect opened if it actually turns out to be incorrect. At least it will get the things clarified. My suggestion would be to try the NTP change and observe the stratum and database replication on cucm cluster for a couple of hours. If all stays well there should be no need for reboot.
Manish
05-05-2016 03:06 AM
I will keep you updated, I asked to change the NTP server stratum for next week in NBH.
I will then monitor the ntp status, if all is good, fine.
if not, I will restart the ntp service and worst case restart the node.
thanks
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