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 <http://mc/compose?to=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<http://mc/compose?to=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 >> > >
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