From: Lee Carter (l2carter@yahoo.com)
Date: Sat Jun 25 2005 - 01:34:41 GMT-3
Remember in a master relation ship you simply take the
time as the client from the master for what it's
worth.
if you are in a peer relationship you both share your
times and aggree on a time based on the differences of
the two to use as the accurate time.
Also, authenticaton on NTP is a tricky one for most.
Really, when doing NTP it's the client that
authenticates the server and not the other way around.
what I mean is that the master only needs the key
configured on it but doesn't need commands like "ntp
authenticate". To test, just setup three routers, one
master and two clients. Once client used
authentication and one doesn't. then change to have
both clients using different authentication keys and
passwords.
HTH
Lee
--- Anthony Sequeira <terry.francona@gmail.com> wrote:
> ntp master - you provide time to others
> ntp server - you do not provide time to others
> ntp peer - you provide time to others
>
> On 6/24/05, ccie2004@excite.com
> <ccie2004@excite.com> wrote:
> > Hi Ed & Anthony, Thank you for your response.
> Sounds like what I have read through cisco's
> documentation I might have misunderstood because I
> have seen references where it says once a system is
> synchronized it can in turn provide ntp services to
> others. Is that only when the ntp master command is
> on this? Just want to confirm. Thx--- On Thu 06/23,
> Ed Lui < edwlui@gmail.com > wrote:From: Ed Lui
> [mailto: edwlui@gmail.com]To:
> ccielab@groupstudy.comDate: Thu, 23 Jun 2005
> 15:34:38 -0700Subject: Re: NTP BasicsIn addition to
> what Anthony mentioned. If your want to provide ntp
> serviceto others(sounds like that is what you wanna
> do), you need "ntp master"instead of "ntp
> server"From Cisco.com :Configuring the System as an
> Authoritative NTP ServerUse the following command in
> global configuration mode if you want thesystem to
> be an authoritative NTP server, even if the system
> is notsynchronized to an outside time
> source:CommandPurposeRouter(config)# *ntp master
> > *[*stratum*]Makes the system an authoritative NTP
> server.On 6/23/05, Anthony Sequeira wrote:>>
> This is how I understand it....>> You use the
> "ntp server" command in order to indicate that your
> system> will RECEIVE time from the system you
> reference in the command.>> You use the "ntp
> peer" command in order to indicate that your
> system> will SEND and/or RECEIVE time from the
> system referenced.>> It is really quite simple
> I guess - and the commands seem to make> perfect
> sense - however, it is clear as mud when you read
> about these> two commands in the Config Guide of
> the online docs, unfortunately.>> On 6/23/05,
> ccie2004@excite.com wrote:> > Hi Ed, Thanks
> for your response. I did look at that link before. I
> am> still having issues trying to understand if
> say a server has a ntp server> command on it
> would it in turn provide ntp services to other
> clients that> point to it. Could you please
> confirm? Thx--- On Wed 06/22, Ed
> > Lui &lt;> edwlui@gmail.com &gt;
> wrote:From: Ed Lui [mailto: edwlui@gmail.com]To:>
> ccielab@groupstudy.comDate: Wed, 22 Jun 2005
> 08:30:30 -0700Subject: Re:> NTP BasicsCheck
>
this>outhttp://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/ffun_c/fcfprt3/fcf012.htm#wp1001170On6/22/05,>;
> ccie2004@excite.com wrote:&gt;&gt; Hi All, I
> am trying to understand the> difference between
> the different&gt; modes in ntp? Peer, Client,
> Broadcast,> Server etc. In addition how is
> a&gt; cisco router configured as a ntp
> server> and when/how is it just a client.
> If&gt; we have a ntp server command on a>
> router would it provide ntp server&gt; services
> to other routers in turn.> Please help. Thank
> you&gt;&gt;> >
>
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