NTP time mismatch between CUCM & VG.

[Ritesh Desai]

Hi folks,

I have installed CUCM cluster in UK region. Cisco 4400 router is synced with Windows AD server. On Cisco IOS, #sh clock detail shows me current UK daylight saving time i.e. 15:34:09:782 GMT Sat May 13 2017

On CUCM, ntp is synced with Cisco 4400 router (same router as above) but there is 1 hour time difference. On CUCM Publisher CLI, #utils ntp status shows me Sat May 13 14:21:26 UTC 2017.

On CUCM Publisher GUI, under Date/Time Group, I have set timezone as Europe/London++

Can someone help regards to this.

thanks & regards,

Ritesh Desai.

[Chris Deren]

Date/Time group pertains only to devices using it, i.e. Phones. The time on the server is set by pointing to NTP, and defining which time zone the server is in. You can check that from CLI:

"utils ntp status"

admin:utils ntp status
ntpd (pid 7984) is running...

remote refid st t when poll reach delay offset jitter
==============================================================================
*192.168.1.20 208.75.88.4 3 u 545 1024 377 2.067 0.878 0.303

synchronised to NTP server (192.168.1.20) at stratum 4
time correct to within 80 ms
polling server every 1024 s

Current time in UTC is : Sat May 13 14:54:10 UTC 2017
Current time in America/Chicago is : Sat May 13 09:54:10 CDT 2017

you can change it with:

"set timezone XXX"

[Ritesh Desai]

Thanks Chris...

in CUCM CLI, i see the same time under Current Time in UTC and Current time in <timezone>.

regards,

Ritesh Desai.

[Chris Deren]

UTC and GMT are always the same, so that is expected for them to show same time:

https://www.timeanddate.com/time/gmt-utc-time.html

Assuming you issued this command few minutes ago, the time showing is correct as it is 15:36 GMT right now.

Can you post "show clock" from the router taken at the same time as from CUCM?

[Ritesh Desai]

Hi Chris,

Statement from te URL which you shared,

the United Kingdom is not on GMT all year, it uses British Summer Time (BST), which is one hour ahead of GMT, during the summer months.

Am deploying CUCM IPT cluster in UK region. What should I define in CUCM. There is no BST in CUCM. So m confused. Please suggest.

thanks & regards,

Ritesh Desai. 

[Chris Deren]

Use Europe/London.

[Ritesh Desai]

Dear Chris,

Thanks... I used what you suggest me. Tough it takes GMT time not British Summer Time (Day Light Saving) time. I found this

URL: https://supportforums.cisco.com/document/13149961/cucm-dst-time-change-takes-place-week-advance

I need to install DST.cop file package on CUCM.

thanks & regards,

Ritesh Desai.

[James Hawkins]

Hi Ritesh,

There is no need for any COP file on CUCM - the timezone Europe-London takes care of this fine. There have been some DST update COP files released in the past but no need on any current releases as far as I am aware.

Note that NTP does not send changes for daylight saving - the host (CUCM server, router or whatever) has to handle this.

On IOS devices such as routers or switches use the following commands.

clock timezone GMT 0

clock summer-time BST recurring last sun march 2:00 last sun october 2:00

HTH

[Ritesh Desai]

Hi James,

Very helpfull. Thanks.

On Router, command was successful and timezone changed to BST.

I have my CUCM Publisher to be synced with Router for NTP. On CUCM Publisher, I restarted NTP though I see GMT +0 timezone and shows me GMT time not BST.

Do I wait for NTP to synced.

Please suggest.

thanks & regards,

Ritesh Desai.

[James Hawkins]

Hi Ritesh,

Thanks for the nice rating.

Where are you looking at the time on CUCM?

The easiest place I find is to ssh to the server using a tool like Putty and use the show status command. This should show British Summer Time (Europe/London)

You can check if the CUCM has synchronised to the NTP servers using the utils ntp status command. You should see a * before the IP address of the router if it has synced.

HTH

James

[Ritesh Desai]

Hi James,

What you have suggested did not worked for me. On CUCM, it shows GMT and 1 hour back compared to Router BST time.

Presently on CUCM I have set timezone as Europe/London.

========================================================

After things dint worked I did the changes, the observation is below

1).

Changing timezone on CUCM GUI to ETC/ GMT+0. Phone reset and displayed 1 hour backward time. On CUCM Publisher show status shows GMT +0 and show ntp status shows 1hour backward time.

2).

On CUCM GUI, timezone changed to Europe/London. Phone reset and displays BST time. On CUCM Publisher CLI, show status command displays GMT +00:00. utils ntp status command output shows GMT+ 1hour backward time.

This is strange! Am using CUCM 11.5. Is there command like we executed on Router "clock summer-time BST recurring last sun march 2:00 last sun october 2:00"

Can you share your configuration if you dont mind, so I cross check if am missing any. Please suggest.

thanks & regards,

Ritesh Desai.

[James Hawkins · Accepted solution]

Hi Ritesh,

NTP will always supply UTC time (i.e. UK time without daylight saving). It is the hosts responsibility to apply offsets  and daylight savings as appropriate. It sounds like your NTP time is correct and your CUCM config is wrong.

What timezone did you choose when you installed CUCM - please post the output of show status

[James Hawkins]

Hi Ritesh,

Sharing the outout of one of my servers as requested.

admin:show status

Host Name : SVRGL1098
Date : Tue May 16, 2017 09:32:45
Time Zone : British Summer Time (Europe/London)
Locale : en_US.UTF-8
Product Ver : 11.5.1.12900-21
Unified OS Version : 6.0.0.0-2

admin:utils ntp status
ntpd (pid 8588) is running...

remote refid st t when poll reach delay offset jitter
==============================================================================
+10.80.1.2 51.63.225.28 4 u 902 1024 377 0.449 1.481 1.378
*10.80.1.3 51.63.225.28 4 u 10 1024 377 0.517 1.345 1.264

[James Hawkins]

Sorry forgot to include the time:

admin:utils ntp status
ntpd (pid 8588) is running...

remote refid st t when poll reach delay offset jitter
==============================================================================
+10.80.1.2 51.63.225.28 4 u 1042 1024 377 0.449 1.481 1.378
*10.80.1.3 51.63.225.28 4 u 150 1024 377 0.517 1.345 1.264

synchronised to NTP server (10.80.1.3) at stratum 5
time correct to within 106 ms
polling server every 1024 s

Current time in UTC is : Tue May 16 08:37:50 UTC 2017
Current time in Europe/London is : Tue May 16 09:37:50 BST 2017

This command was run at 9:37 BST

[Ritesh Desai]

Hi James,

Problem got resolved yesterday. During the deployment, timezone was set was GMT +0. Changing timezone to Europe/London resolved the issue.

thanks & regards,

Ritesh Desai.