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A group of NTP servers at the same Stratum level (Stratum 1 time servers, for example)

are considered as NTP Peers to each other.

NTP Servers at a higher Stratum level, on the other hand, are called NTP Servers (Note

that Internet Time Servers should be configured as NTP Servers and not as NTP Peers).

Note: IMPORTANT: In order for other NTP servers to be a valid reference,

you must enable “NTP” in the Reference Priority table (see "Configuring

Input Reference Priorities" on page154).

For mutual fallback purposes, it is recommended to use one or more NTP Peers. Each peer

is normally configured to operate from one or more time sources including reference

clocks or other higher stratum servers. If a peer loses all reference clocks or fails, the other

peers continue to provide time to other clients on the network.

NTP Servers at the same Stratum level

If VersaSync is configured to obtain time from other NTP Servers at the same Stratum

level (i.e., NTP Peers) but is currently using a different input reference as its selected ref-

erence, VersaSync will report to the network (via the NTP time stamps) that it is a

Stratum1 time server. Should, however, all input references except the other NTP server

(s) become unavailable, VersaSync will then drop to a Stratum2 time server (with System

Time being derived from the NTP time packets being received from the other NTP Peers.

NTP Servers at a higher Stratum level

If VersaSync is configured to obtain time from another NTP Server at a higher Stratum

level (i.e., NTP Servers), and it is using that NTPServer as its selected reference, Ver-

saSync will report to the network (via the NTP time stamps) that it is one less Stratum than

its selected reference NTP Server.

E X A M P L E :

If VersaSync is configured to receive time from one or more Stratum1 NTP Servers, with no

other higher priority input references available, VersaSync will report to the network that it is a

Stratum2 Server.

In order for VersaSync to use other NTP servers as a valid time reference to synchronize

the System Time, the input Reference Priority Setup table must be configured to allow

NTP as an available reference. For more information on the input Reference Priority table,

refer to "Configuring Input Reference Priorities" on page154.

Holdover

108

CHAPTER 2 • VersaSync User Manual Rev. 7.0

2.8 Configuring Network Settings

Orolia VersaSync User Manual

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