[cisco-voip] NTP Sync in CUCM 7.x under VMware

[Paul]

There is a known issue with VMware Linux guests trying to use NTP. The time goes wild and is unreliable. The best way to make NTP work is to let all time sync go through the host as Wes has already pointed out.



________________________________
From: Gregory Wenzel <gwenzit at yahoo.com>
To: Mark Holloway <mh at markholloway.com>; John Parduhn <parduhn at gmail.com>
Cc: Matthew Melbourne <matt at melbourne.org.uk>; cisco-voip at puck.nether.net
Sent: Wednesday, April 29, 2009 7:44:05 AM
Subject: Re: [cisco-voip] NTP Sync in CUCM 7.x under VMware


I have 7.0.1 running in vmware. My pub points to my external 2811 which points to time.windows.com and it works fine. Are you just running vmware with no external gateway for ntp source. 


GregW 
CCVP
"Money and sex, storage and bandwidth-->Only too much is ever enough"
          Quoted from Arno Penzias, former head of Bell Labs.
 
 

--- On Tue, 4/28/09, John Parduhn <parduhn at gmail.com> wrote:


From: John Parduhn <parduhn at gmail.com>
Subject: Re: [cisco-voip] NTP Sync in CUCM 7.x under VMware
To: "Mark Holloway" <mh at markholloway.com>
Cc: "Matthew Melbourne" <matt at melbourne.org.uk>, cisco-voip at puck.nether.net
Date: Tuesday, April 28, 2009, 10:52 PM


I'm having the same problem in 7.0(2a), and like Matthew, didn't have issues using 6.1(2) in VMWare.  I disabled NTP, but now my 7941 will not keep in sync with CallManager; IP Communicator works fine.

John


On Tue, Apr 28, 2009 at 16:55, Mark Holloway <mh at markholloway.com> wrote:

I have an ISR configured as an NTP master on the same subnet as my VMWare
host and guests.  NTP appears to be working fine.


-----Original Message-----
From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Wes Sisk
Sent: Tuesday, April 28, 2009 2:49 PM
To: Matthew Melbourne
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] NTP Sync in CUCM 7.x under VMware

VMWare recommends not using NTP on guests.  Synch the host and let the
guests follow the host.

/Wes

On Tuesday, April 28, 2009 5:31:45 PM, Matthew Melbourne
<matt at melbourne.org.uk> wrote:
> Hi,
>
> I have installed CUCM 7.0(2a) under VMware, but I am unable to get it
> synchronise to an external NTP server. I've tried several external NTP
> servers, but using the platform "utils ntp status" CLI command shows that
it
> is configured (and reachable) but will not sync with the external time
> source. The Publisher appears to synchronise momentarily but quickly loses
> sync and starts following its own clock. Also, I notice that the appliance
> hardware clock is losing time, as compared to the VM Host OS time. I'm
sure
> certain I didn't have this problem with a CUCM 6.1(3) VM.
>
> Cheers,
>
> Matt
>
>

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