Time Protocols

SNTP: Viewing, Selecting, and Configuring

In the factory-default configuration (where TimeP is the selected time synchronization method), show sntp still lists the SNTP configuration even though it is not currently in use. For example:

Even though, in this example, TimeP is the current time synchronous method, the switch maintains the SNTP configuration.

Figure 8-3. Example of SNTP Configuration When SNTP Is Not the Selected Time Synchronization Method

Configuring (Enabling or Disabling) the SNTP Mode

Enabling the SNTP mode means to configure it for either broadcast or unicast mode. Remember that to run SNTP as the switch’s time synchronization protocol, you must also select SNTP as the time synchronization method by using the CLI timesync command (or the Menu interface Time Sync Method parameter).

Syntax: timesync sntp

Selects SNTP as the time protocol.

sntp < broadcast unicast >

Enables the SNTP mode (below

 

and page 8-10).

sntp server < ip-addr>

Required only for unicast mode

 

(page 8-10).

sntp poll-interval < 30 . . 720>

Enabling the SNTP mode also

 

enables the SNTP poll interval

 

(default: 720 seconds; page 8-12).

Enabling SNTP in Broadcast Mode. Because the switch provides an SNTP polling interval (default: 720 seconds), you need only these two commands for minimal SNTP broadcast configuration:

Syntax: timesync sntp

Selects SNTP as the time synchronization

 

method.

sntp broadcast

Configures Broadcast as the SNTP mode.

For example, suppose:

 

8-9