yes you lower the stratum at HQ with the ntp master command, but the issue is
the UTC server has the higest stratum... so if you put any stratum on HQ it
will only syn to itself and not the UTC server.... higher stratum will syn from
lower stratum that is how it works.. I am going to put only ntp server and ntp
source on hq and set the ntp on cucm to be hq loopback and let it set for hours
and see it can syn again... if it doesnt syn i will put the ntp master and
reboot and see if it syns..
________________________________
From: Ashraf Ayyash <ash.ayy...@gmail.com>
To: Justin Barksdale <jus...@barksdale.net>
Cc: Ray <jonha...@yahoo.com>; "ccie_voice@onlinestudylist.com"
<ccie_voice@onlinestudylist.com>
Sent: Monday, September 19, 2011 8:51 AM
Subject: Re: [OSL | CCIE_Voice] ntp
Hello All ,
i have review the NTP principle again with my Colleagues and with Amit
who did lab for this ( Thanks ALOT) and we have done some show
commands on the CCM and the IOS in regard of this issue
what we found is that the the lowest stratum is the Best and stratum
-0 is the lowest value we have in Cisco world,
what Justin and the other stated is correct , we will not need Master
command to sync the other internal network components to the HQ router
, its enough to sync HQ with the UTC based server and then the other
routers should take the time correctly from the HQ on UTC based as
well
the CCM pub is stratum 11 by default and the SUB is 12 , do utils ntp
status before you sync them , so based on the above , to sync the CCM
with the HQ ntp please make sure that you have Stratum lower than 11
at your HQ and you should be good to go ,
Justain , Amit , everyone , thank you for sharing / discussing this
issue , this is very helpful and add new info for me and i hope the
same happened for another people
Best Regards
Ash
On Sun, Sep 18, 2011 at 11:11 PM, Justin Barksdale <jus...@barksdale.net> wrote:
> If this is the case then the address you are pointing to at the pstn is
> incorrect. If you add the ntp server to the router and do show ntp status
> the router MUST be syncing with an external source or UCM will not sync.
> Furthermore a reboot is not required on UCM or ther router. Simply add the
> address to UCM and do utils ntp restart from cli. The key is that the ntp
> source the router is syncing with must be valid.
>
> Sent from my iPhone 4.
> On Sep 19, 2011, at 1:12 AM, Ray <jonha...@yahoo.com> wrote:
>
> Ntp is not slow when i put the ntp master command on HQ router and the cucm
> syn right the way. i took off the ntp master from the hq and only have ntp
> server and ntp source lo0. and reboot the cucm and the hq. and let it set
> for 4hrs to 5hrs and the cucm would not syn, but the moment i put the ntp
> master it syns within 2 mins... you can try it in you lab and let me know..
> make sure you reboot the cucm and the hq router...
> ________________________________
> From: Justin Barksdale <jus...@barksdale.net>
> To: "ccie_voice@onlinestudylist.com" <ccie_voice@onlinestudylist.com>
> Sent: Sunday, September 18, 2011 9:14 PM
> Subject: Re: [OSL | CCIE_Voice] ntp
>
> NTP is by nature slow. An earlier post pointed out the correct method. If
> the question wants you to sync hq with the pstn and then ccm with hq then
> the ntp master command will break this requirement. All that is required on
> the HQ router is ntp server x.x.x.x
>
> This is also mentioned in Vic's class class as well as Cisco documentation.
> The important key here is that the ntp master command can cause you to
> override a valid external time source and thus can be very dangerous. As
> long as the ntp server command points to a valid and reachable ntp source
> then the hq router will sync and you WILL be able to sync ucm without the
> ntp master command.
>
> Justin Barksdale
> CCIE# 29866
> Voice
>
> Sent from my iPhone 4. Please excuse any typos.
>
> On Sep 18, 2011, at 7:39 PM, ccie_voice-requ...@onlinestudylist.com wrote:
>
>> Re: [OSL | CCIE_Voice] ntp
> _______________________________________________
> 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
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>
>
>
> _______________________________________________
> 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
