Technical data

Configuring and Managing NTP
12.8 NTP Utilities
12.8.3.2 NTPDC Control Message Commands
Control message commands request information about the server. These are
read-only commands in that they make no modification of the server configuration
state.
The NTPDC control message commands are:
•
listpeers
Displays a brief list of the peers for which the server is maintaining state.
These include all configured peer associations as well as those peers whose
stratum is such that they are considered by the server to be possible future
synchonization candidates.
•
peers
Obtains a list of peers for which the server is maintaining state, along with a
summary of that state. The summary information includes:
The address of the remote peer
The local interface address (0.0.0.0 if a local address has not been
determined)
The stratum of the remote peer (a stratum of 16 indicates the remote peer
is unsynchronized)
The polling interval (in seconds)
The reachability register (in octal)
The current estimated delay, offset, and dispersion of the peer (in
seconds)
In addition, the character in the left margin indicates the mode this peer
entry is operating in, as follows:
Plus sign (+) denotes symmetric active.
Minus sign (-) indicates symmetric passive.
Equals sign (=) means the remote server is being polled in client mode.
Up arrow (^) indicates that the server is broadcasting to this address.
Tilde (~) denotes that the remote peer is sending broadcasts.
Asterisk (*) marks the peer to which the server is currently
synchronizing.
The contents of the host field may be one of four forms. It may be:
Host name
IP address
Reference clock implementation name with its parameter
REFCLK (implementation number parameter) .
If you specify hostnames no , only IP addresses will be displayed.
• dmpeers
Displays a slightly different peer summary list, identical to the output of the
peers command, except for the character in the leftmost column. Characters
only appear beside peers that were included in the final stage of the clock
selection algorithm.
Dot (.) indicates that this peer was rejected in the falseticker detection.
Plus sign (+) indicates that the peer was accepted.
Configuring and Managing NTP 12–19