204 SyncServer 600 Series User’s Guide 098-00720-000 Revision D1 – February, 2018
Chapter 6 Provisioning
Provisioning NTP Associations
Provisioning NTP Associations
The SyncServer can have multiple associations, each with a different Role. NTP
associations with non-valid IP addresses and domain names are not shown in the
Associations list. (If a known good domain name does not appear on this list, there
may be a problem with the DNS server configuration or with the DNS service itself.)
Table 6-12 describes the method to add a new NTP association.
Table 6-13 describes the method to modify an existing NTP association.
Table 4-7 provides descriptions of NTP Association configuration parameters.
The list of Current NTP Associations always includes the local Hardware Clock,
which:
Cannot be deleted or edited.
Is configured as a preferred server
("server 127.127.45.0 prefer # pseudoaddress for the hardware clock" according
to ntp.conf).
Is displayed at the top of the list.
The user should consider adding NTP servers available on the local network to the
list of Current NTP Associations.
NTP Prefer Selection
By default the SyncServer S6x0 Series has the NTP Prefer selected for the local
hardware reference clock. In most operating scenarios the local hardware reference
clock (which more often than not will be tracking GNSS) will be the only reference
being used. With the Prefer being selected, and no statistically better reference
available, the time server will achieve Stratum 1 status on startup or restart as
rapidly as possible. If the Prefer is not selected for the hardware reference clock
then the NTP daemon will go through a standard validation procedure for a
reference clock. This procedure will take several minutes and should happen by the
time the reach indicates 377 on the reference clock association. For optimal
operation, Microsemi recommends the local hardware reference remain selected as
a Prefer in the configuration.
Note: The NTP hardware reference clock is by default marked with
the NTP "prefer" setting. If the user wants to mark a different
association as preferred, then the hardware clock should have the
"prefer" unselected. The system will not prevent the user from setting
multiple associations as "prefer", although this is usually not useful.
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