final conclusion with the NTP issue.. I found out that if there is no ntp
master command CUCM will never syn with HQ router.. the moment i added ntp
master it syns right the way, but Hq is only getting the clock from itself not
from the UTC..... some one can try this and lets see. I spend the whole day on
this.. I think the question was set wrong. I would raise a red flag if i see
this question anywhere.
142.1.64.254
The NTP service not accessible.
hq#sho ntp st
Clock is synchronized, stratum 16, reference is 157.26.1.100
nominal freq is 250.0000 Hz, actual freq is 250.0007 Hz, precision is 2**24
reference time is D220FBD3.3C663F3F (16:22:59.235 SDT Sun Sep 18 2011)
clock offset is -0.0037 msec, root delay is 0.00 msec
root dispersion is 0.01 msec, peer dispersion is 0.00 msec
loopfilter state is 'CTRL' (Normal Controlled Loop), drift is -0.000002808 s/s
system poll interval is 64, last update was 359 sec ago.
hq#sho ntp ass
address ref clock st when poll reach delay offset disp
*~157.26.1.100 127.127.1.1 15 48 64 377 0.000 -3.764 3.994
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
hq#
________________________________
From: Ashraf Ayyash <ash.ayy...@gmail.com>
To: Michael Luo <hout...@gmail.com>
Cc: Ray <jonha...@yahoo.com>; ccie voice <ccie_voice@onlinestudylist.com>
Sent: Sunday, September 18, 2011 10:21 AM
Subject: Re: [OSL | CCIE_Voice] ntp
Thank you Michael , lets wait for Ray to check the lab results for this
Ash
On Sun, Sep 18, 2011 at 8:19 AM, Michael Luo <hout...@gmail.com> wrote:
Take a look at this link:
http://www.cisco.com/en/US/docs/ios/12_1/configfun/configuration/guide/fcd303.html#wp1001926
>
>The two examples explain when you'll need "ntp master".
>
>Hope this helps!
>Michael
>
>
>
>On Sun, Sep 18, 2011 at 10:14 AM, Ashraf Ayyash <ash.ayy...@gmail.com> wrote:
>
>i have read this note but it didn't stated that the router can provide clock
>without master command , in here we have one ntp source in our network which
>is the HQ (from all the network entities ) and HQ is getting clock from
>external NTP ,
>>
>>Ray , can you please try what guys suggest here ?
>>
>>Ash
>>
>>
>>
>>On Sun, Sep 18, 2011 at 8:11 AM, Michael Luo <hout...@gmail.com> wrote:
>>
>>We should not use "ntp master" on HQ router. This command is only needed if
>>the router cannot reach any NTP source. Since the HQ router can reach the
>>backbone (PSTN) router, it does not require "ntp master".
>>>
>>>If you look at the link, you'll notice this note:
>>>
>>>===========
>>>Use this command with extreme caution. It is very
easy to override valid time sources using this command, especially if a
low stratum number is configured. Configuring multiple machines in the
same network with the ntp master command can cause instability in timekeeping
if the machines do not agree on the time.
>>>===========
>>>
>>>Michael
>>>
>>>
>>>
>>>On Sun, Sep 18, 2011 at 4:28 AM, Ashraf Ayyash <ash.ayy...@gmail.com> wrote:
>>>
>>>Hi all ,
>>>>
>>>> if we took off the master command we will not be able to sync our internal
>>>>network entities to the HQ router , please feel free to correct me if i am
>>>>wrong ,
>>>>
>>>>the output you gave Ray for the first email and the config say that you
>>>>have added the master command before you synced with the external ntp
>>>>and so your internal router got the highest level ,
>>>>
>>>>to get rid of this you can configure the ntp server and then make sure that
>>>>you are synced and then use the master command with lower stratum level
>>>>and this should do the trick for you ,
>>>>
>>>>below the link :
>>>>http://www.cisco.com/en/US/docs/ios/12_1/configfun/configuration/guide/fcd303.html#wp1004877
>>>>
>>>>Ash
>>>>
>>>>
>>>>
>>>>On Sat, Sep 17, 2011 at 11:35 PM, Ray <jonha...@yahoo.com> wrote:
>>>>
>>>>i found the issue , i took out the ntp master and then shut down/ no shut
>>>>my f0/0 connecting to the UTC server, and the clock was syncing as below..
>>>>good
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>hq#sh ntp ass
>>>>>
>>>>>
>>>>> address ref clock st when poll reach delay offset
>>>>>disp
>>>>>*~157.26.1.100 127.127.1.1 15 63 64 377 0.000 2901006
>>>>>3.641
>>>>> * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~
>>>>>configured
>>>>>
>>>>>
>>>>>hq#sho run | s ntp
>>>>>ntp source Loopback0
>>>>>ntp server 157.26.1.100
>>>>>--- On Sat, 9/17/11, Marko Milivojevic <mar...@ipexpert.com>wrote:
>>>>>
>>>>>
>>>>>>From: Marko Milivojevic <mar...@ipexpert.com>
>>>>>>Subject: Re: [OSL | CCIE_Voice] ntp
>>>>>>To: "Ray" <jonha...@yahoo.com>
>>>>>>Cc: "ccie voice" <ccie_voice@onlinestudylist.com>
>>>>>>Date: Saturday, September 17, 2011, 11:44 PM
>>>>>>
>>>>>>
>>>>>>
>>>>>>Why did you configure your router to be NTP master? When you did that,
>>>>>>on which stratum did your router operate? If it was less than 15, will
>>>>>>it sync to a server on stratum 15?
>>>>>>
>>>>>>Answer these questions and you'll know the answer to yours :-)
>>>>>>
>>>>>>--
>>>>>>Marko Milivojevic - CCIE #18427
>>>>>>Senior Technical Instructor - IPexpert
>>>>>>
>>>>>>FREE CCIE training: http://bit.ly/vLecture
>>>>>>
>>>>>>Mailto: mar...@ipexpert.com
>>>>>>Telephone: +1.810.326.1444
>>>>>>Web: http://www.ipexpert.com/
>>>>>>
>>>>>>On Sat, Sep 17, 2011 at 18:14, Ray <jonha...@yahoo.com> wrote:
>>>>>>> looking at the sho ntp ass below and the config below. I could not make
>>>>>>> the
>>>>>>> Hq router syn its time from 1567.26.1.100. this question troubled me
>>>>>>> when i
>>>>>>> took the exams. any idea!!!!!!!.. the UTC server at 157.26.1.100 was
>>>>>>> set to
>>>>>>> stratum 15 i think... so how can u make HQ syn time from the UTC
>>>>>>> server... I
>>>>>>> was confused here..
>>>>>>> ntp source Loopback0
>>>>>>> ntp master
>>>>>>> ntp server 157.26.1.100
>>>>>>>
>>>>>>> hq#sho ntp ass
>>>>>>> address ref clock st when poll reach delay offset
>>>>>>> disp
>>>>>>> *~127.127.1.1 .LOCL. 7 12 16 377
0.000 0.000
>>>>>>> 0.238
>>>>>>> ~157.26.1.100 78.85.76.76 16 34 64 376 0.000 2901016
>>>>>>> 2.591
>>>>>>> * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~
>>>>>>> configured
>>>>>>> _______________________________________________
>>>>>>> For more information regarding industry leading CCIE Lab training,
>>>>>>> please
>>>>>>> visit www.ipexpert.com
>>>>>>>
>>>>>>> Are you a CCNP or CCIE and looking for a job? Check out
>>>>>>> www.PlatinumPlacement.com
>>>>>>>
>>>>>>
>>>>>_______________________________________________
>>>>>For more information regarding industry leading CCIE Lab training, please
>>>>>visit www.ipexpert.com
>>>>>
>>>>>Are you a CCNP or CCIE and looking for a job? Check out
>>>>>www.PlatinumPlacement.com
>>>>>
>>>>
>>>>_______________________________________________
>>>>For more information regarding industry leading CCIE Lab training, please
>>>>visit www.ipexpert.com
>>>>
>>>>Are you a CCNP or CCIE and looking for a job? Check out
>>>>www.PlatinumPlacement.com
>>>>
>>>
>>
>
_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
