Cisco SCE 1000 2xGBE User's Guide download pdf (Page 157)

Chapter 6 Control Configuration

Time Clocks and Time Zone

SCE 1000 2xGBE Release 2.0.10 User Guide

OL-7117-02 6-11

Time Clocks and Time Zone

The SCE 1000 has three types of time settings, which can be configured: the clock, the calendar,

and the time zone. It is important to synchronize the clock and calendar to the local time, and to

set the time zone properly. The SCE 1000 does not track Daylight Saving Time automatically, so

you must update the time zone when the time changes bi-annually.

The SCE 1000 has the following two time sources:

• A real-time clock, called the calendar, that continuously keeps track of the time, even when

the SCE 1000 is not powered up. When the SCE 1000 reboots, the calendar time is used to set

the system clock. The calendar is not used for time tracking during system operation.

• A system clock, which creates all the time stamps during normal operation. This clock clears

if the system shuts down. During a system boot, the clock is initialized to show the time

indicated by the calendar.

It does not matter which clock you set first, as long as you use the clock and calendar read

commands to ensure they are synchronized.

The time zone settings are important because they allow the system to communicate properly with

other systems in other time zones. The system is configured based on Greenwich Mean Time

(GMT), which is standard in the industry for coordination with other manufacturers’ hardware and

software. For example, Pacific Standard Time would be written as PST-10, meaning that the name

of the time zone is PST, which is 10 hours behind Greenwich Mean Time.

When setting and showing the time, the time is always typed or displayed according to the local

time zone configured.

Showing System Time

To display the current time of the system clock:

Step 1 From the SCE 1000(config)# prompt, type show clock and press Enter.

The time maintained by the system clock appears.

EXAMPLE:

The following example shows the current system clock.

SCE 1000#show clock

12:50:03 UTC MON November 13 2001

Showing Calendar Time

To display the current time and date of the system calendar:

Step 1 From the SCE 1000# prompt, type show calendar and press Enter.

The current system calendar appears.

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Cisco SCE 1000 2xGBE User's Guide Page 157