From: Charles Church (cchurch@wamnet.com)
Date: Thu Jun 26 2003 - 15:59:47 GMT-3
I think there might be a catch, like when the difference in stratum is more
than 'X'. I'm not sure what 'X' is though. Must be more than 1. I seem to
get different results with different IOS major versions, so it's hard to see
exactly what the correct behavior is.
Chuck Church
CCIE #8776, MCNE, MCSE
Wam!Net Government Services
13665 Dulles Technology Dr. Ste 250
Herndon, VA 20171
Office: 703-480-2569
Cell: 703-819-3495
cchurch@wamnet.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?search=chuck+church&op=index
-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Thursday, June 26, 2003 2:28 PM
To: Group Study; Charles Church
Subject: Re: NTP
Hi Chuck,
Thanks for getting back to me.
Assuming what you're saying is correct, does that mean it's not possible in
a network of 2500's without any connection to the Internet to sync up to one
particular router? I thought router-1 would use it's manually set software
clock to provide a source time to NTP and since that router has the lowest
stratum the other routers would sync to it. Even though router-1 time might
not be correct, at least, if the the routers in the network can sync up with
it, their times will be correct relative to router-1's time.
Also, what does it mean when the output of show ntp asso shows the reference
clock being 127.127.7.1 ? Is that address just some arbitrary address
specified in the RFC meaning that the device is getting clock from itself?
Thanks again, Jim
----- Original Message -----
From: "Charles Church" <cchurch@wamnet.com>
To: "ccie2be" <ccie2be@nyc.rr.com>; "Group Study" <ccielab@groupstudy.com>
Sent: Thursday, June 26, 2003 1:43 PM
Subject: RE: NTP
> Jim,
>
> From what I understand about NTP, neither router will ever sync to the
> other. The reason they're doing that is they're both clients, in addition
> to being servers. And a client won't accept an update from a server
unless
> that server is synchronized to a higher stratum source. Point rtr 1 out
to
> a registered NTP source on the 'Net, and it should start working. I think
> there might be a command to make a router with a calendar (hardware clock)
a
> stratum 0, but I'm not sure about that one.
>
> Chuck Church
> CCIE #8776, MCNE, MCSE
> Wam!Net Government Services
> 13665 Dulles Technology Dr. Ste 250
> Herndon, VA 20171
> Office: 703-480-2569
> Cell: 703-819-3495
> cchurch@wamnet.com
> PGP key: http://pgp.mit.edu:11371/pks/lookup?search=chuck+church&op=index
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> ccie2be
> Sent: Thursday, June 26, 2003 1:15 PM
> To: Group Study
> Subject: NTP
>
>
> Hi all,
>
> I have 2 2500's connected via ethernet and they can ping each other's
> loopback
> and ethernet addresses.
>
> This is the NTP config of each:
>
> RTR-1
>
> ntp master 6
> ntp server 192.168.2.2 source lo0
>
>
> RTR-2
>
> ntp master 7
> ntp server 192.168.1.1 source lo0
>
>
> Both routers have there system clocks set to different dates and times.
>
> When I do a "show ntp asso det" on rtr-2, it shows
>
> 192.168.1.1 configured, insane, invalid...
>
> Why is this and what should I do about it?
>
> I thought NTP will compare "notes" and select the source with the lowest
> statum to be the authoritative source and that the other will sync to it
but
> that doesn't seem to happening.
>
> Thanks, Jim
>
>
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