From: Saad Adam (subjectvsobject@yahoo.com)
Date: Fri Feb 10 2006 - 07:26:57 GMT-3
Hi,
Strantum increments with the number of hop counts. The topolog is a bit confusing, If R4 is the NTP server with a stratum of 2 then all the directly connected peers will have a hop count of 1, and that is used to increment the stratum on them making it statum 3. If a peer is 2 hops away, then the statum will be 2(Server statum) + 2(for the hops)= 4 statrum.
There are cases where a device is more than 5 hops away, from the ntp server and the question will ask u to have a stratum of lets say 3, which at first site might seem impossible in that case u might consider using a gre tunnel to reduce the hop counts.
Good luck.
Saad.
Anderson Mota Alves <mota_anderson@hotmail.com> wrote:
I also suggest you to always set the clock set on the routers before
configure ntp with command "clock set" since the machines will be using
the hardware clock beforing establishing synchronization with server.
And I forgot to mention you that I think you can't configure a 3550 as
master so use a router as an example for that othewise you won't have the
command ntp master available, but I may be wrong on this.
Does anybody know if ntp master is supported on 3550 switches with newer
IOS or it's not supported at all?
Regards,
Andy
--------------------------------------------------------------------
From: sameer azam
To: Anderson Mota Alves
Subject: Re: NTP Quesion
Date: Thu, 9 Feb 2006 14:33:44 +0400
hi,Do u mean that when u configure R1 as the MASTER with a stratum of
2 then automatically other ( SW & R4) will set their stratum value to
3. See i understand the stratum concept and that is no more than this
that lower the value better the stratum is. but when when asked to
configure the A SECIFIC Stratum value on R4 & Sw do u need to
configure that or not?and also there is no NTP MASTER command on the
CAT 3550. so in this what should be the correct answer. Regards
On 2/9/06, Anderson Mota Alves wrote:
Hi Sameer,
Since you need to have the clients with a stratum of 3 in order
to accomplish that you need to configure the server with a
stratum of 2, so in this case the clients will be getting the
stratum with a value of 3.
Solution:
SW: loopback 0's SW: 12.12.7.7
ntp server 12.12.1.1
ntp source loopback 0
R4: loopback 0's R4: 12.12.4.4
ntp server 12.12.1.1
ntp source loopback 0
R1: (the server) Loopback 0's R1: 12.12.1.1
ntp master 2
ntp source loopback 0
Note that I haven't configured any stratum value on SW since this
router will
be getting this value from the server (R1)
If you have a way to set this up please do it and then let me
know if everything worked fine.
Regards,
Andy
------------------------------------------------------------
From: Ivan
Reply-To: Ivan
To: ccielab@groupstudy.com, sameer azam
Subject: Re: NTP Quesion
Date: Thu, 9 Feb 2006 11:56:47 +0300
>lake(config)#ntp master ?
> <1-15> Stratum number
>
>
> > The topology is like follows;
> >
> > SW
> >
> >
> >
R1______---_______R4
> >
> > The link between R1 & Sw is Ethernet connection.
> > The link between R1 & R4 is Frame-Relay Connection.
> >
> > The QUESTION IS;
> >
> > You need to configure the R4 & SW for STRATUM 3
> > Both of R4 & SW should get get their time clock from the
R1.
> >
> > How would you do this?
> >
>
>--
>Ivan
>
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