Remove ntp.conf file override from dhclient-script.
A fresh install of CUCM on the subscriber stops during NTP set up or, for already installed CUCM nodes, the subscriber fails to closely track the publisher's time.
When the CUCM node is configured to use DHCP and the DHCP server has "option ntp-servers " configured in its dhcpd.conf file.
Remove entry "option ntp-servers " from dhcpd.conf on the DHCP server and restart the DHCP server process. If a fresh install of CUCM was being done, restart the fresh install. If this was for an existing CUCM installation, create a remote account, login to the CUCM node and enter: cd /etc; mv ntp.conf.predhclient ntp.conf
Further Problem Description:
This only applies to CUCM nodes configured to use DHCP. Status
Just wanted to let you know this post resolved my issue. Subscriber was running 30 mins behind Publisher, showing unsynchronised on the SUB. Removing the NTP Servers already configured on the PUB, then readding them bought my subscriber back to the correct time. No reboot was required..
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