Updating NTP server on Call Manager

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03-19-2018 02:09 PM - edited 03-17-2019 12:27 PM
Hello, I'm looking to update our NTP server on our call manager. I've read instructions on how to add it and they say to restart the NTP service. Should this be done when no one is using the system? I'm worried it might affect network connectivity.
utils ntp server add x.x.x.x
utils ntp restart
After completing this do I need to do any other configurations either in CLI or on the web interface to get this working?
We are getting the errors below which caused me to look into the issue.
Log file: platform/log/diag2.log
Starting diagnostic test(s)
===========================
test - disk_space : Passed (available: 1579 MB, used: 12577 MB)
skip - disk_files : This module must be run directly and off hours
test - service_manager : Passed
test - tomcat : Passed
test - tomcat_deadlocks : Passed
test - tomcat_keystore : Passed
test - tomcat_connectors : Passed
test - tomcat_threads : Passed
test - tomcat_memory : Passed
test - tomcat_sessions : Passed
skip - tomcat_heapdump : This module must be run directly and off hours
test - validate_network : Error, intra-cluster communication is broken, unabl e to connect to [172.17.2.36] Error, intra-cluster c ommunication is broken, unable to connect to [172.17.4.36]
test - raid : Passed
test - system_info : Passed (Collected system information in diagnostic log)
test - ntp_reachability : Failed
The host 172.17.2.1 is not reachable, or it's NTP service is down.
ntpd (pid 12214) is running...
remote refid st t when poll reach delay offset jitter
==============================================================================
172.17.2.1 .INIT. 16 u 4 1024 0 3.030 -0.044 0.000
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03-19-2018 02:58 PM - edited 03-19-2018 02:59 PM
it will need to be set up as an NTP server, if its a cisco switch/router depending on what device it is (ntp master off the top of my head)
also can you ping the 172.17.2.1 from cucm?

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03-20-2018 06:04 AM
Hi, thank you. Yes I can ping that address from CUCM, it is directly connected I believe. After looking at 17.17.2.1 NTP configurations it is pointing to our actual NTP server 172.16.1.1 (using an example IP). Is it possible that somehow 17.17.2.1 was forwarding that NTP information to CUCM? I am not sure why we all of a sudden got this NTP warning though so no changes have been made. How would you recommend I proceed?
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03-19-2018 03:07 PM
CUCM doesn't randomly choose an NTP, someone configured CUCM to use that IP as the NTP. CUCM validates the NTP is working in order for it to be configured, it won't accept a bogus IP that doesn't provide NTP.
The change is quite easy, you can do it via CLI and be done in less than 5 minutes.
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03-20-2018 06:06 AM
Thank you, I guess where I'm getting confused is why is why is this error coming up all of a sudden when no changes have been made. Would you recommend pointing CUCM to our actual NTP server? Do you know if there would be any network interference when changing NTP servers?
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03-20-2018 08:34 AM
You need to use a reliable NTP, if the one you're pointing to is not reliable, then point to the real NTP.
No network services will be affected by adding/removing/restarting NTP.
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03-20-2018 10:56 AM
Jaime,
Doesn't changing the NTP nullify your licensing too? He will have to request new licenses, right?
Justin Ferello
Technical Support Specialist, ScanSource KBZ
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03-20-2018 10:58 AM
Only for 8.x and below where we used a licensing MAC.
NTP has no relationship with licensing for releases that use ELM/PLM/Smart Licensing
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03-20-2018 11:02 AM
Justin Ferello
Technical Support Specialist, ScanSource KBZ
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03-20-2018 11:09 AM
See this bug.
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03-20-2018 11:12 AM
Thanks for the bug. Good to know! I guess since our PLM and Pub are on the same box/host that changing the NTP must have changed the MAC of the Ethernet interface?
Is it still best practice to static assign the MAC for the PLM interface? Is there a certain number that people use?
Justin Ferello
Technical Support Specialist, ScanSource KBZ
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03-20-2018 11:20 AM
I'm using a co-res PLM in my lab, so, no, changing the NTP does NOT change the VM MAC address.
PLM install guide has the static MAC note.
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04-28-2020 08:20 AM
Is there any documentation in regards with that ?
I.e. What changes will require a licence rehost for any Cisco UC apps ?
NTP?
Certificate ?
I tried to search for an official doc and wasn't able to.
Thx in advance.
