From: CCIE (ccie@xxxxxxxxx)
Date: Tue Aug 27 2002 - 19:19:00 GMT-3
Here is a good explaination taken from Bradshawlabs webpage:
The association of two routers can operate in one of several modes:
server, client, peer, and broadcast/multicast.
The modes are further classified as active and passive:
Active modes: The host continues to send NTP messages regardless of
the reachability or stratum of its peer. Client, Peer, Broadcast /
Mulicast
Passive modes: The host sends NTP messages only as long as its
peer is reachable and operating at a stratum level less than or equal to the
host. Server, Peer
X Server Mode
By operating in server mode, a host (usually a LAN time server) announces
its willingness to synchronise, but not to be synchronised by a peer. This
type of association is ordinarily created upon arrival of a client request
message and exists only in order to reply to that request, after which the
association is dissolved. Server mode is a passive mode.
X Client Mode
By operating in client mode, the host (usually a LAN workstation) announces
its willingness to be synchronised by, but not to synchronise the peer. A
host operating in client mode sends periodic messages regardless of the
reachability or stratum of its peer. Client mode is an active mode.
X Peer Mode
By operating in peer mode (also called "symmetric" mode), a host announces
its willingness to synchronise and be synchronised by other peers. Peers can
be configured as active (symmetric-active) or passive (symmetric-passive).
X Broadcast/Multicast Mode
By operating in broadcast or multicast mode, the host (usually a LAN time
server
operating on a high-speed broadcast medium) announces its willingness to
synchronise all of the peers, but not to be synchronised by any of them.
Broadcast mode requires a broadcast server on the same subnet, while
multicast mode requires support for IP multicast on the client machine, as
well as connectivity via the MBONE to a multicast server. Broadcast and
multicast modes are active modes.
----- Original Message -----
From: "Volkov, Dmitry (Toronto - BCE)" <dmitry_volkov@ca.ml.com>
To: <ccielab@groupstudy.com>
Sent: Tuesday, August 27, 2002 5:31 PM
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
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:39 GMT-3