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Time Protocols
SNTP: Viewing, Selecting, and Configuring
Configuring Unicast and Broadcast Mode
To enable authentication, either unicast or broadcast mode must be config-
ured. When authentication is enabled, changing the mode from unicast to
broadcast or vice versa is not allowed. You must disable authentication and
then change the mode.
To set the SNTP mode or change from one mode to the other, enter the
appropriate command.
Syntax: sntp unicast
sntp broadcast
Enables SNTP for either broadcast or unicast mode.
Default: SNTP mode is disabled by default. SNTP does not
operate even if specified by the CLI timesync command or by
the menu interface Time Sync Method parameter.
Unicast: Directs the switch to poll a specific server periodically
for SNTP time synchronization. The default value between each
polling request is 720 seconds but can be configured. At least
one manually configured server IP address is required.
Note: At least one key-id must be configured as trusted and it
must be associated with one of the SNTP servers. To edit or
remove the associated key-id information or SNTP server
information, SNTP authentication must be disabled.
Broadcast: Directs the switch to acquire its time
synchronization from data broadcast by any SNTP server to
the network broadcast address. The switch uses the first server
detected and ignores any others. However, if the Poll Interval
(configurable up to 720 seconds) expires three times without
the switch detecting a time update from the original server, the
switch accepts a broadcast time update from the next server it
detects.
Displaying SNTP Configuration Information
The show sntp command displays SNTP configuration information, including
any SNTP authentication keys that have been configured on the switch.
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