Cisco SF500-24 Administration Manual page 91

System Time
System Time Options
NOTE
Cisco 500 Series Stackable Managed Switch Administration Guide
As part of the boot process, the switch always configures the time, time zone, and
DST in some way. These parameters are obtained from either the PC running the
GUI, SNTP, values set manually, or if all else fails, from the factory defaults.
Time
The following methods are available for setting the system time on the switch:
• Manual—The user manually sets 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 in order 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 the user configures this feature for the first time, if the time was not
already set, the device sets the time from the PC.
This way 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 switch 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.
Time Zone and Daylight Savings Time (DST)
The Time Zone and DST can be set on the switch in the following ways:
• Dynamic configuration of the switch through a DHCP server, where:
- Dynamic DST, when enabled and available, always takes precedence
over the manual configuration of DST.
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