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The OpenVMS Frequently Asked Questions (FAQ)


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#c6 om higher strata andDcan provide time to lower strata, and automatically adjust the localEstratum. The highest stratum is one, and the lowest available stratumr is fifteen.r

oFThe TCP/IP Services NTP package can operate at any stratum, and can beDconfigured as a peer, as a client, or as a broadcast server. NTP canealso provide time to a DECnet-Plus DTSS network, see Section 4.2.)

sGWith TCP/IP Services V5.0 and later, the only supported reference clockeFis the LCL (local system clock). If your system has an excellent clockGor if the system time is being controlled by some other time service or.Gperipheral (such as DTSS services, GPS services, a cesium clock, a GPIBGcontroller or other similar time-related peripheral), you can configureDNTP to use the system clock as its reference source. This will mimicDthe master-clock functionality, and will configre NTP as a stratum 1Htime server. To do this, enter the following commands in TCPIP$NTP.CONF:

t 
g
"
server 127.127.1.0 preferifudge 127.127.1.0 stratum 0l




oDFor local-master functionality, the commands are very similiar. Use:

e 
h
"
server 127.127.1.0fudge 127.127.1.0 stratum 8s

t


nDThe difference between these two is the stratum, and the omission ofFthe prefer keyword. Specifying a higher stratum allows the node to actDas a backup NTP server, or potentially as the sole time server on anCisolated network. The server will become active only when all othereCnormal synchronization sources are unavailable. The use of "prefer"e8causes NTP to always use the specified clock as the timesynchronization source.x

/FWith the TCP/IP Services versions prior to V5.0, the NTP management isDrather more primitive. To co