which to use as NTP server

Unanswered Question
Jul 18th, 2010

,Hi, I have HQ router as NTP server. Pub points to router for NTP refrence.

For others, Sub, Unity, Presence, etc. Which one should I use as time server?

Thanks.

I have this problem too.
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David Hailey Sun, 07/18/2010 - 15:01

Within a CUCM cluster, the Subscribers always recover clock from the Publisher.  Unity (i.e., Windows version) doesn't typically require NTP configuration as it participates in the AD domain membership.  CUPS and other servers (like a Unity Connection server) can sync NTP from the HQ router as well.

Hailey

Leo Laohoo Sun, 07/18/2010 - 20:24

I wouldn't configure Cisco appliance as an authoritative NTP server.

If you have Windows servers, you can configure them to be an authoritative NTP server.

How to configure an authoritative time server in Windows XP
http://support.microsoft.com/kb/314054

How to configure an authoritative time server in Windows Server
http://support.microsoft.com/kb/816042

How to configure an authoritative time server in Windows 2000
http://support.microsoft.com/kb/216734

David Hailey Sun, 07/18/2010 - 20:38

You can certainly do that...not a bad idea.  However, you can (if you need to) use a router as an NTP source.  It's probably better than relying on the hardware clock of each different app server.  The ideal solution is probably a dedicated NTP server such as Symmetricon.

Hailey

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