Cisco Cisco SG300-28 28-Port Gigabit Managed Switch Maintenance Manual

System Time Options

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Cisco 300 Series Managed Switches Administration Guide

System time can be set manually by the user, dynamically from an SNTP server, or 
synchronized from the PC running the GUI. If an SNTP server is chosen, the manual 
time settings are overwritten when communications with the server are 
established.

As part of the boot process, the device always configures the time, time zone, and 
DST. These parameters are obtained from the PC running the GUI, SNTP, values 
set manually, or if all else fails, from the factory defaults. 

The following methods are available for setting the system time on the device:

•

Manual—User must manually set the time.

•

From PC—Time can be received from the PC by using browser information. 

The configuration of time from the computer is saved to the Running 
Configuration file. You must copy the Running Configuration to the Startup 
Configuration to enable the device to use the time from the computer after 
reboot. The time after reboot is set during the first WEB login to the device.

When you configure this feature for the first time, if the time was not already 
set, the device sets the time from the PC. 

This method of setting time works with both HTTP and HTTPS connections.

•

SNTP—Time can be received from SNTP time servers. SNTP ensures 
accurate network time synchronization of the device up to the millisecond by 
using an SNTP server for the clock source. When specifying an SNTP server, 
if choosing to identify it by hostname, three suggestions are given in the GUI:

-

time-a.timefreq.bldrdoc.gov

-

time-b.timefreq.bldrdoc.gov

-

time-c.timefreq.bldrdoc.gov

After the time has been set by any of the above sources, it is not set again by the 
browser.

SNTP is the recommended method for time setting.