NTP for callmanager

[ciscoforum]

I am going to use an external NTP for CCM cluster. Do I just need to change the xntp file on publisher server to point to external NTP or I have to edit all the servers in the cluster? Thanks

[gogasca]

http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Archive&topic=Voice%20and%20Video&CommCmd=MB%3Fcmd%3Dpass_through%26location%3Doutline%40%5E1%40%40.1dda9d0b/1#selected_message

Do this in every server in the cluster for CCM 4.x

[ciscoforum]

Cisco document didn't specify how the subs should be configured, pointing to pub or ntp. I see my customer's sub pointing to pub while pub pointing to ntp and works well. Can you find the specific link/doc talking about it's necessary that sub has to point to ext ntp too? Thanks

[Rob Huffman]

Hi CF,

The NTP config can just be set on the Publisher and then leave the Subs pointing at the Pub. This doc explains this in some detail (NTP for Pub and C:\WINNT\system32\net.exe time \\CCM /set /y for Subs) This is how we use NTP and it works perfectly;

How To Configure Time Synchronization for Cisco CallManager and Cisco Unity

http://www.cisco.com/en/US/products/sw/voicesw/ps556/products_configuration_example09186a008009470f.shtml

Hope this helps!

Rob