Configuring unicast and broadcast mode for authentication

To enable authentication, you must configure either unicast or broadcast mode. 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.

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.