Sntp Unicast Time Polling With Multiple Sntp Servers; Address Prioritization - SMC Networks SMC6624M Management Manual

Configuring IP Addressing, Time Synchronization, Interface Access, and System Information
Time Synchronization Protocol Options

SNTP Unicast Time Polling with Multiple SNTP Servers

When running SNTP unicast time polling as the time synchronization method,
the switch requests a time update from the server you configured with either
the Server Address parameter in the menu interface, or the primary server in
a list of up to three SNTP servers configured using the CLI. If the switch does
not receive a response from the primary server after three consecutive polling
intervals, the switch tries the next server (if any) in the list. If the switch tries
all servers in the list without success, it sends an error message to the Event
Log and reschedules to try the address list again after the configured Poll
Interval time has expired.

Address Prioritization

If you use the CLI to configure multiple SNTP servers, the switch prioritizes
them according to the decimal values of their IP addresses. That is, the switch
compares the decimal value of the octets in the addresses and orders them
accordingly, with the lowest decimal value assigned as the primary address,
the second-lowest decimal value assigned as the next address, and the third-
lowest decimal value as the last address. If the first octet is the same between
two of the addresses, the second octet is compared, and so on. For example:
SNTP Server
IP Address
10.28.227.141
10.28.227.153
10.29.227.100
5-32
Server Ranking According to
Decimal Value of IP Address
Primary
Secondary
Tertiary