Re: ntp peer

peer
Allows time requests and NTP control queries and allows the system to
synchronize to the remote system.

Basically you can have two ntp peers that synchronise their time somewhere in
the medium with this command but this isn't a authoritative clock source such
as when we declare "ntp server x.x.x.x" which is the correct way to configure
an ntp peer to the server then "ntp master 1" on the server, also worth noting
in order to update the software clock from the hardware clock then use "clock
callander-valid" note this overrides a software update source hence you would
also serve your peers with the hardware clock not best practice I read.

For the biggest caveat with ntp I'd refer to the md5 one-way and two-way
authentication and INE's blog:

http://blog.ine.com/2007/12/28/how-does-ntp-authentication-work/

--
BR
Tony
Sent from my iPad
> On 30 Oct 2013, at 18:25, Imran Ali <immrccie_at_gmail.com> wrote:
>
> BUMPING ..
>
> in  many  labs   i have seen both  routers  have   ntp  peers  commands
> pointed out  at  each  other , (like bgp )
>
> however  which case is  true  ?
>
> show  we need  to point  at only  one router   to  make  one  active  and
> other  passive
> or   issue   command   :ntp  peer  x.x.x.x   on  both  routers
>
>
> guys  with access to real gear can  lab  this up quickly  to know   that
> " show ntp associations"
> is  not  showing one peer  as  " invalid "
>
>
>
>
>> On Wed, Oct 30, 2013 at 6:28 PM, Imran Ali <immrccie_at_gmail.com> wrote:
>>
>> Experts
>>
>> it is mentioned  (in  360)  that if  we configure NTP peers  commands on
>> should  not be given  on both routers.
>>
>> issuing ntp peer command  makes the router in ntp symmetric  acitve mode
>> and if both routers  becomes  active  , one of them  will make   the
>> association as invalid
>>
>> any thoughts  on this
>>
>> if  in lab it says  to configure R1 and R2  as  ntp  peers for each other
>> , then i guess we need to only configure  router as ntp peer.
>
>
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