21Field Descriptionsynch distanceThe synchronization distance relative to the upper-level clock, inseconds, and calculated from dispersion and roundtrip delayvalues.refidIdentifier of the primary reference source. When the stratum level ofthe primary reference clock is 0, it is displayed as “LOCL”.Otherwise, it is displayed as the IP address of the primary referenceclock.ntp-service accessSyntaxntp-service access { peer | query | server | synchronization } acl-numberundo ntp-service access { peer | query | server | synchronization }ViewSystem viewDefault level3: Manage levelParameterspeer: Permits full access. This level of right permits the peer devices to perform synchronization andcontrol query to the local device and also permits the local device to synchronize its clock to that of a peerdevice. Control query refers to query of NTP status information, such as alarm information, authenticationstatus, and clock source information.query: Permits control query. This level of right permits the peer devices to perform control query to theNTP service on the local device but does not permit a peer device to synchronize its clock to that of thelocal device.server: Permits server access and query. This level of right permits the peer devices to performsynchronization and control query to the local device but does not permit the local device to synchronizeits clock to that of a peer device.synchronization: Permits server access only. This level of right permits a peer device to synchronize itsclock to that of the local device but does not permit the peer devices to perform control query.acl-number: Basic ACL number, which ranges from 2000 to 2999.DescriptionUse the ntp-service access command to configure the access-control right for the peer devices to accessthe NTP services of the local device.Use the undo ntp-service access command to remove the configured NTP service access-control right tothe local device.By default, the access-control right for the peer devices to access the NTP services of the local device isset to peer.From the highest NTP service access-control right to the lowest one are peer, server, synchronization,and query. When a device receives an NTP request, it matches against the access-control right in thisorder and uses the first matched right.
