NTP Synch Issue Callmanager 7.1.5x

[dave.hodgkiss]

admin:utils ntp status
ntpd (pid 24190) is running...

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*127.127.1.0     LOCAL(0)        10 l   65   64  377    0.000    0.000   0.004
10.30.1.125     10.12.1.202     14 u  141  512  376    0.291  53046.7 706.471

synchronised to local net at stratum 11
   time correct to within 12 ms
   polling server every 512 s

Current time in UTC is : Tue Sep 28 13:52:49 UTC 2010
Current time in Europe/London is : Tue Sep 28 14:52:49 BST 2010
admin:

Hi All,

Quick one.   The NTP server shows as accesible in the GUI. When i run a Utils ntp status command from cli it shows the active NTP source as the local publisher. I recently upgraded from ccm 4.2 to 7.1.5 has anyone seen this before. All my subscribers are using the Publisher as the time source. I have deleted the ntp source re-added and re-booted the publisher still no joy.

I have also ran utils network capture port 123

15:02:31.665868 IP cm-ssl-s1.ntp > cm-ssl-p.ntp: NTPv4, Client, length 48
15:02:31.665927 IP cm-ssl-p.ntp > cm-ssl-s1.ntp: NTPv4, Server, length 48
15:02:33.667032 IP cm-ssl-s1.ntp > cm-ssl-p.ntp: NTPv4, Client, length 48
15:02:33.667082 IP cm-ssl-p.ntp > cm-ssl-s1.ntp: NTPv4, Server, length 48
15:02:35.668126 IP cm-ssl-s1.ntp > cm-ssl-p.ntp: NTPv4, Client, length 48
15:02:35.668178 IP cm-ssl-p.ntp > cm-ssl-s1.ntp: NTPv4, Server, length 48
15:02:37.662494 IP 10.8.35.250.ntp > cm-ssl-p.ntp: NTPv3, Client, length 48
15:02:37.662574 IP cm-ssl-p.ntp > 10.8.35.250.ntp: NTPv3, Server, length 48
15:02:37.670492 IP cm-ssl-s1.ntp > cm-ssl-p.ntp: NTPv4, Client, length 48
15:02:37.670539 IP cm-ssl-p.ntp > cm-ssl-s1.ntp: NTPv4, Server, length 48
15:02:39.671707 IP cm-ssl-s1.ntp > cm-ssl-p.ntp: NTPv4, Client, length 48
15:02:39.671754 IP cm-ssl-p.ntp > cm-ssl-s1.ntp: NTPv4, Server, length 48

Control-C pressed

Does NTPv3 make a difference or could it be that the ntp server is stratum 14

Help !!!!!!!!!!!!!

Dave

[Rob Huffman]

Hi Dave,

I believe it could well be the Stratum level;

Ensure that external NTP servers are stratum 9 or higher (1-9).

http://www.ciscosystems.or.at/en/US/docs/voice_ip_comm/cucm/cucos/7_1_2/cucos/iptpch4.pdf

Cheers!

Rob

[dave.hodgkiss]

Hi Rob,

Thanks for the reply.

I think it is running Stratum 14. If you look at the Utils ntp status it shows as 14,

Regards

Dave

[David Hailey]

With NTP, a higher numerical value is not the same as a "higher" stratum value.  For instance, a Stratum 0 source might be a local root NTP server source,  It has the most accurate time.  Stratum 1 devices would receive time from a Stratum 0 device.  If you are trying to connect to an NTP server with stratum level 14 then as Rob said - this is the likely culprit.  As Rob said, you should ensure your server is 9 or higher (i.e., goes down in value, not up).  I do not know if your source is internal vs. external.  However, you could easily configure a local ISR gateway or other network device as an NTP source and set it as the NTP source for CUCM.

Hailey

[dave.hodgkiss]

Thanks for that. I will try a local router as the NTP source.

Cheers Fellas.

[David Hailey]

FYI - a local router will not necessarily be a Stratum 0 or 1 device but it can support being in the 9 or better spectrum.  A stratum 0 or 1 may be an NTP server like Symmetricon or something along those lines.  You don't necessarily need the most accurate time in the world for CUCM to sync with an NTP source.

Just something to keep in mind.

[dave.hodgkiss]

Hi Dave,

Just one more thing. The customer has given me another NTP server to try. Ican ping it, but the CCM GUI shows it as inacessible. Do know why this could be ???

Cheers

Dave

[David Hailey]

Few things - could be lower stratum than the first server or the same as CUCM GUI is rejecting it.  Could also be firewall - hard to say on this end.

Hailey

[dave.hodgkiss]

No Worries, i will plod on.

[dave.hodgkiss]

Hi Rob,

The URL is faulty

Cheers

Dave

[Rob Huffman]

Hi Dave,

My understanding here is that the lower the Stratum number the more trusted the source

(ie:1 being the highest Stratum level) . That being said, 14 would not meet the CUCM baseline

criteria

Cheers!

Rob

PS: the link works fine for me??