From: Pierre-Alex GUANEL (paguanel@gmail.com)
Date: Sat Jul 26 2008 - 18:40:24 ART
For reference RFC 1305.
"
Symmetric Active (1): A host operating in this mode
sends periodic
messages regardless of the reachability state or
stratum of its peer. By
operating in this mode the host announces its
willingness to synchronize
and be synchronized by the peer.
Symmetric Passive (2): This type of association is
ordinarily created
upon arrival of a message from a peer operating in the
symmetric active
mode and persists only as long as the peer is
reachable and operating at
a stratum level less than or equal to the host;
otherwise, the
association is dissolved. However, the association
will always persist
until at least one message has been sent in reply. By
operating in this
mode the host announces its willingness to synchronize
and be
synchronized by the peer. "
Cheers
Pierre-Alex
----- Original Message -----
From: ehiwe peter
To: Pierre-Alex GUANEL
Cc: GAURAV MADAN ; Cisco certification
Sent: Saturday, July 26, 2008 9:45 PM
Subject: Re: NTP peer
if u put ntp peer on both sides the two routers will both "argue" on which
time to use before they finally agree on a time.
for case two both routers R2 will derive time from R1
both cases will work fine
On 7/26/08, Pierre-Alex GUANEL <paguanel@gmail.com> wrote:
Hi
Don't put the "ntp peer" statement on both sides.
This will result in an "insane" status.
Configure only one one side.
Lab it up and check for yourself ...
Cheers
Pierre-Alex
----- Original Message ----- From: "GAURAV MADAN"
<gauravmadan1177@gmail.com>
To: "Cisco certification" <ccielab@groupstudy.com>
Sent: Friday, July 25, 2008 1:06 PM
Subject: NTP peer
Hi
I want some clearifications for NTP peer command .
If we want 2 routers to maintain consistent time between them .
What will happen in following 2 scenarios :
R1 (10.0.0.1) ---------(10.0.0.2 ) R2
R1
ntp peer 10.0.0.2
!
R2
ntp peer 10.0.0.1
what timing will they finally use ? (R1's or R2's) or .. willl they
negotiate to some diff time ?
2) If I say :
R1
ntp master <stratum>
ntp peer 10.0.0.2
!
and nothing on R2 .. will this cause R2 to derive timing info from R1 ?
Thnx in advance
Gaurav Madan.
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