From: Church, Chuck (cchurch@wamnetgov.com)
Date: Fri Oct 24 2003 - 14:51:24 GMT-3
John,
NTP relies on Greenwich Mean Time. All time passed on is GMT, and not affected by the timezone setting of that server passing it on. Time received from an NTP server is assumed to be GMT. Timezone and DST settings are only locally significant. So if your master is on the east coast, set it to EST -5, and turn on recurring summertime. A router in Indiana pointed to that master would also set EST -5, but not the summertime, since Indiana doesn't do DST. A router in California using the east coast master gets PST -8 and the summertime setting (I think CA does DST). HTH.
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@wamnetgov.com
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=index&search=cchurch%40wamnetgov.com
-----Original Message-----
From: John Smith [mailto:c00per_omers1@yahoo.com]
Sent: Friday, October 24, 2003 1:43 PM
To: ccielab@groupstudy.com
Subject: Question on timezone / daylight savings / summertime.
I can use clock time EST -5 to set my time for Eastern Standard time. So this weekend the time change from daylight saving to standard time. If I don't have summer time cfg'd on my router does it matter, is EST still -5?
Now from an exam persepctive, If I was to suddenly drop my RTP exam and decide to take my exam in Sunny California or treat myself to a trip to Brussels, what should the
timezone be set at?
Finally, I keep having this discussion on NTP and whether you only need timezone set on the master or through out the environment. From my testing if I leave time at UTC then do a clock set to lets say 13:29:00 24 Oct 2003, then it shows up as such when I show clock. Now if I set timezone the time ( sometimes even the date ) then jumps back the -5 etc... So I know I need to clock time EST -5 on my master then clock set to get the right time.
On the peers if timezone is not set, will the Master send timezone as well as date/time or must timezone be set on each router? I say no the master will not send and yes it must be set on each router participating. My testing shows this to be the case, so I now do a clock time in notepad, while doing my cfg of aliases and line settings, this then gets pasted to each router ( oh-oh should this be done on the switch as well? I've never seen a senario for this on a 3550 ?). My buddy says not required as the master will send, but I've never seen it happen.
Anyone have the definative answer???
John...
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