From: Brian Dennis (brian@xxxxxx)
Date: Tue Aug 27 2002 - 23:18:03 GMT-3
Network Time Protocol (NTP) RFC 958
http://www.faqs.org/rfcs/rfc958.html
5.1. Protocol Modes
The distinction between client and server is significant only in
the way they interact in the request/response interchange. The
same NTP message format is used by each peer and contains the same
data relative to the other peer. In the unsymmetric mode the
client periodically sends an NTP message to the server, which then
responds within some interval. Usually, the server simply
interchanges addresses and ports, fills in the required
information and sends the message right back. Servers operating in
the unsymmetric mode then need retain no state information between
client requests.
In the symmetric mode the client/server distinction disappears.
Each peer maintains a table with as many entries as active peers,
each entry including a code uniquely identifying the peer (e.g.
Internet address), together with status information and a copy of
the Originate Timestamp and Receive Timestamp values last received
from that peer. The peer periodically sends an NTP message to each
of these peers including the latest copy of these timestamps. The
interval between sending NTP messages is managed solely by the
sending peer and is unaffected by the arrival of NTP messages from
other peers.
Brian Dennis, CCIE #2210 (R&S/ISP Dial)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Volkov, Dmitry (Toronto - BCE)
Sent: Tuesday, August 27, 2002 2:31 PM
To: 'ccielab@groupstudy.com'
Subject: NTP server/peer
Hello,
Can somebody explain the difference between "ntp server" and "ntp peer"
commands ?
I always used to use "ntp server".
I read this:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/
fun_
c/fcprt3/fcd303.htm#xtocid2708216
and Doyle and Solie... and still don't understand when is suitable to
use
"ntp peer".
Thanks,
Dmitry
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