■ Sync Dist.—Measure of the total time error since the update in the path
to the stratum 1 server
■ Peer Delay—Round-trip delay, with the lowest dispersion value in the
sample buffer, between the system and the server
■ Peer Dispersion—Lowest measure, in the sample buffer, of the error
associated with the peer offset, based on the peer delay and precision
■ Offset—Difference, with the lowest dispersion in the sample buffer,
between the system’s clock and the server’s clock
■ Reachability—8-bit number that shows whether or not the NTP server
responded to the last eight requests from the system; one indicates a
response; zero indicates no response. For example, 11111111 indicates
that the NTP server responded to the last eight requests. If the system
reaches one server less often than it does other servers, that server is
not a good choice for the master.
■ Precision—Length of the clock tick (interrupt interval) of the server’s
clock
■ Source—IP address of the interface to which NTP servers should send
NTP responses
■ Timestamps of latest time samples from this peer; actual timestamps
displayed depends on how the server is configured
■ Root reference at—Last time at which the stratum 1 server sent an NTP
reply to the server
■ Last request sent—Last time at which the system sent an NTP request
to the server
■ Response/Broadcast was sent—Last time at which the server sent an
NTP reply or broadcast to the system
■ Response/Broadcast received—Last time at which the system received
an NTP reply or broadcast from this server
■ Sample buffer for this peer contains the following samples:
■ Delay—Round-trip delay from client to server
■ Offset—Difference between client’s and server’s clocks
■ Dispersion—Measure of the errors of the offset values, based on the
round-trip delay and the precisions of the system and the server
■ Example
host1# show ntp associations detail
Peer 10.6.129.58 is selected, stratum 3
Peer is a Broadcast Server, version 3, broadcasts every 64 sec
Root Delay 0.059052 sec, Dispersion 0.189056 sec, Sync Dist. 0.229679 sec
Peer Delay -0.000016 sec, Dispersion 0.009665 sec, Offset 0.050714 sec
Reachability 11111110, Precision 0.000000 sec
'Source' Interface : default (transmit interface)
Monitoring NTP ■ 535
Chapter 10: Configuring the System Clock
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