07-26-2010 07:53 AM - edited 03-15-2019 11:54 PM
We have CUCM version 7 is it possible to run it as NTP server so routers,Switches and access Points Sync. time with it and If possible how could I do configure this?
Thanks and best regards
07-26-2010 08:06 AM
Usually, CUCM will sync the time from the router, not the reverse.
Once the time was synced, CUCM publisher will also be acting as a NTP server. So CUCM subscribers and sync the time from publisher.
Michael
07-26-2010 08:20 AM
Indeed, you should follow the best practices.
• For Cisco Unified CallManager Versions 5.0 and later:
– Manual configuration of the ntpd.conf file is not allowed.
– Cisco Unified CallManager prompts the administrator to specify the external NTP server at publisher installation and automatically populates the ntpd.conf file on the publisher server.
– The ntpd.conf files of all other cluster servers are automatically configured to point to the publisher as the NTP source.
• Configure the publisher to point to a traceable stratum 1 clock source.
• Configure network latency between the publisher and the dedicated clock source so that it is within 40 milliseconds round-trip time (RTT).
• For additional information about NTP time synchronization for Cisco Unified CallManager, please refer to the Solution Reference Network Design (SRND) guide for your specific version at http://www.cisco.com/go/srnd.
From SRND:
Unified CM NTP Time Synchronization
Time synchronization is especially critical on Unified CM servers. In addition to ensuring that CDR
records are accurate and that log files are synchronized, having an accurate time source is necessary for
any future IPSec features to be enabled within the cluster and for communications with any external
entity.
Unified CM 5.0 and later releases automatically synchronize the NTP time of all subscribers in the
cluster to the publisher. During installation, each subscriber is automatically configured to point to an
NTP server running on the publisher. The publisher considers itself to be a master server and provides
time for the cluster based on its internal hardware clock unless it is configured to synchronize from an
external server. Cisco highly recommends configuring the publisher to point to a Stratum-1, Stratum-2,
or Stratum-3 NTP server to ensure that the cluster time is synchronized with an external time source.
HTH
java
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07-26-2010 10:51 AM
Thanks a lot all Java about this helpful Information.
07-26-2010 07:14 PM
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
Otherwise, use a dedicated NTP server that synchronizes itself using GPS. The reason why I don't recommend a Cisco appliance as an authoritative NTP/SNTP server is because the clock chip is similar to a PC. It doesn't have a dedicated method of verifying. You can get a cheap NTP server that uses GPS (best method so far). Another option is to open a port in the firewall to allow the device(s) to talk to world-wide NTP pool.
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