topic Re: NTP / CUCM 12.5 Installation in Collaboration Applications

NTP / CUCM 12.5 Installation

mid230 — Mon, 31 May 2021 21:12:51 GMT

I am installing CUCM 12.5 in a lab environment where I connect my laptop directly to the server via a switch. The CUCM will not be connected to the network. I will not add DNS IP.

Will the installation compete successfully even though the CUCM will not be able to confirm the NTP IP address as it is not connected to the network.

Re: NTP / CUCM 12.5 Installation

Jaime Valencia — Mon, 31 May 2021 21:58:10 GMT

No, an NTP is mandatory during the installation. After you enter the NTP server(s) they're checked right after that step to confirm they're valid and will not allow you to move if none are valid.

Re: NTP / CUCM 12.5 Installation

mid230 — Mon, 31 May 2021 22:08:29 GMT

Can I use my laptop Windows as the NTP server to complete the installation?

Re: NTP / CUCM 12.5 Installation

Jaime Valencia — Mon, 31 May 2021 22:12:39 GMT

Windows NTPs are not supported, you can review NTP requirements in the SRND.

Re: NTP / CUCM 12.5 Installation

mid230 — Mon, 31 May 2021 23:26:43 GMT

Thanks

Re: NTP / CUCM 12.5 Installation

Nithin Eluvathingal — Tue, 01 Jun 2021 00:33:21 GMT

you can make your cisco switch a ntp server. if you have are using a cisco switch to connect the server try the below commands.

ntp master 2

ntp server time.google.com>> switch sync time from time.google.com.internet access is required for switch.

Re: NTP / CUCM 12.5 Installation

Roger Kallberg — Thu, 03 Jun 2021 05:44:36 GMT

For a lab you can if you want skip the connection to an external NTP server and just use the internal clock in the switch as the time for the NTP.

We did this for an isolated network that we stood up for a migration process from 5 down to 3 UC (CM, CUC, CUPS and CCX) systems that we did a few years back. For the purpose of this it worked perfectly.

Re: NTP / CUCM 12.5 Installation

Erick Zabala — Sun, 16 Mar 2025 07:12:31 GMT

You can use this NTP server in Win10
ntp-4.2.8p15a-win32-setup.exe (4.25 MB)
19. April 2023
NTP package with IPv6 support for Windows XP and newer

https://www.meinbergglobal.com/english/sw/ntp.htm#ntp_stable

Documentation:
https://www.satsignal.eu/ntp/setup.html