3Com Switch 8800 Configuration Guide Chapter 49 NTP Configuration49-8ntp-service unicast-server or ntp-service unicast-peer command also designates atransmitting interface, use the one designated by them.49.2.6 Setting NTP Master ClockThis configuration task is to set the external reference clock or the local clock as theNTP master clock.Perform the following configuration in system view.Table 49-11 Set the external reference clock or the local clock as the NTP master clockOperation CommandSet the external reference clock or thelocal clock as the NTP master clock.ntp-service refclock-master[ ip-address ] [ stratum ]Cancel the NTP master clock settings undo ntp-service refclock-master[ ip-address ]ip-address specifies the IP address 127.127.1.u of a reference clock, in which u rangesfrom 0 to 3. stratum specifies how many stratums the local clock belongs to and rangesfrom 1 to 15.The IP address defaults 127.127.1.0, and the stratum defaults to 8.49.2.7 Setting Authority to Access a Local Ethernet SwitchSet authority to access the NTP services on a local Ethernet Switch. This is a basic andbrief security measure, compared to authentication. An access request will be matchedwith peer, server, server only, and query only in an ascending order of the limitation.The first matched authority will be given.Perform the following configuration in system view.Table 49-12 Set authority to access a local Ethernet switchOperation CommandSet authority to access a localEthernet switchntp-service access { query |synchronization | server | peer } acl-numberCancel settings of the authority toaccess a local Ethernet switchundo ntp-service access { query |synchronization | server | peer }IP address ACL number is specified through the acl-number parameter and rangesfrom 2000 to 2999. The meanings of other authority levels are as follows:query: Allow control query for the local NTP service only.synchronization: Allow request for local NTP time service only.
