MDE-LEDI-NETWORK-TDS-4099V3.0
Client mode
► The NTP client sends queries to all servers one by one according to their position in the
list. The NTP client therefore first sends a query to the server at the top of the list at start-
up. If the first server is unavailable or if no NTP address is provided, the query is sent to
the second server and so on.
The “Client mode” defines how the NTP client switches from one server to another under
normal operation, in the event of loss and return of the servers’ availability (hardware
failure, network failure, etc.).
Sync these servers by
descending priority
The NTP client only changes server if the current server is unavailable.
For example:
- The NTP client is synchronised to server 1.
- An incident on server 1 makes it unavailable.
- The NTP client then synchronises to server 2.
- Server 1 becomes available again.
- The NTP client remails synchronised to server 2.
Note: in this mode, the transmission of NTP requests is minimised.
Sync highest available
server in the list
The NTP client tries to reach the server at the top of the list.
For example:
- The NTP client is synchronised to server 1.
- An incident on server 1 makes it unavailable.
- The NTP client then synchronises to server 2.
- The NTP client continues to send requests to monitor the availability of
server 1.
- Server 1 becomes available again.
The NTP client switches back to server 1 and stops sending queries to
server 2.
Note: in this mode, the NTP client continues to send queries to server(s)
located higher on the list than the server it is synchronised with.
Server list
► Use these fields to enter the IPv4 addresses of the NTP servers. If an MD5 key number
is specified, the LEDI
®
Network TDS will add the corresponding MD5 signature to NTP
requests sent to the servers.
The Use gateway box must be checked if the server to be contacted is outside of the
local network.
Statistics on server availability are also available:
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