75Parameters|: Filters command output by specifying a regular expression. For more information about regularexpressions, see Fundamentals Configuration Guide.begin: Displays the first line that matches the specified regular expression and all lines that follow.exclude: Displays all lines that do not match the specified regular expression.include: Displays all lines that match the specified regular expression.regular-expression: Specifies a regular expression, a case-sensitive string of 1 to 256 characters.Usage guidelinesThe display ntp-service trace command takes effect only when the local device and all the devices on theNTP server chain can reach one another. Otherwise, this command is unable to display all the NTPservers on the NTP chain due to timeout.Examples# Display brief information about each NTP server from the local device back to the primary referencesource. display ntp-service traceserver 127.0.0.1,stratum 2, offset -0.013500, synch distance 0.03154server 133.1.1.1,stratum 1, offset -0.506500, synch distance 0.03429refid LOCLThe output shows an NTP server chain for server 127.0.0.1: Server 127.0.0.1 is synchronized to server133.1.1.1, and server 133.1.1.1 is synchronized to the local clock source.Table 14 Command outputField Descriptionserver IP address of the NTP server.stratum Stratum level of the corresponding system clock.offset Clock offset relative to the upper-level clock, in seconds.synch distance Synchronization distance relative to the upper-level clock, in seconds, andcalculated from dispersion and roundtrip delay values.refidIdentifier of the primary reference source. When the stratum level of the primaryreference clock is 0, it is displayed as LOCL. Otherwise, it is displayed as the IPaddress of the primary reference clock.ntp-service accessUse ntp-service access to configure the access-control right for the peer devices to access the NTPservices of the local device.Use undo ntp-service access to remove the configured NTP service access-control right to the localdevice.Syntaxntp-service access { peer | query | server | synchronization } acl-numberundo ntp-service access { peer | query | server | synchronization }
