B
ASIC
C
ONFIGURATION
3-27
Setting the System Clock
Simple Network Time Protocol (SNTP) allows the switch to set its internal
clock based on periodic updates from a time server (SNTP or NTP).
Maintaining an accurate time on the switch enables the system log to
record meaningful dates and times for event entries. You can also manually
set the clock using the CLI. (See “calendar set” on page 4-76.) If the clock
is not set, the switch will only record the time from the factory default set
at the last bootup.
This switch acts as an SNTP client in two modes:
Unicast – The switch periodically sends a request for a time update to a
configured time server. You can configure up to three time server IP
addresses. The switch will attempt to poll each server in the configured
sequence.
Broadcast – The switch sets its clock from a time server in the same subnet
that broadcasts time updates. If there is more than one SNTP server, the
switch accepts the first broadcast it detects and ignores broadcasts from
other servers.
Configuring SNTP
You can configure the switch to send time synchronization requests to
specific time servers (i.e., client mode), update its clock based on
broadcasts from time servers, or use both methods. When both methods
are enabled, the switch will update its clock using information broadcast
from time servers, but will query the specified server(s) if a broadcast is
not received within the polling interval.
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