Cisco Systems OL-7396-01 Configuring the Clock and Calendar

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ATM Switch Router Software Configuration Guide
OL-7396-01
Chapter4 Configuring System Management Functions
Configuring the Clock and Calendar
The following example displays the NTP status:
Switch# show ntp status
Clock is synchronized, stratum 4, reference is 198.92.30.32
nominal freq is 250.0000 Hz, actual freq is 249.9999 Hz, precision is 2**24
reference time is B6C04F19.41018C62 (18:21:13.253 UTC Thu Feb 27 1997)
clock offset is 7.7674 msec, root delay is 113.39 msec
root dispersion is 386.72 msec, peer dispersion is 1.57 msec
Configuring the Clock and Calendar
If no other source of time is available, you can manually configure the current time and date after the
system is restarted. The time will remain accurate until the next system restart. Cisco recommends that
you use manual configuration only as a last resort.
Note If you have an outside source to which the ATM switch router can synchronize, you do not need to
manually set the system clock.
Configuring the Clock
To configure, read, and set the ATM switch router as a time source for a network based on its calendar,
perform the following steps in global configuration mode:
To manually read and set the calendar into the ATM switch router system clock, perform the following
steps in privileged EXEC mode:
To display the system clock information, use the following EXEC command:
Command Purpose
Step1 Switch(config)# clock calendar-valid Sets the ATM switch router as the default clock.
Step2 Switch(config)# clock summer-time zone
recurring [week day month hh:mm week day
month hh:mm [offset]]
Configures the system to automatically switch to
summer time (daylight savings time), use one of
the formats of the clock summer-time
configuration command.
Step3 Switch(config)# clock timezone zone hours
[minutes]
Configures the system time zone.
Command Purpose
Step1 Switch# clock read-calendar Reads the calendar.
Step2 Switch# clock set hh:mm:ss day month year Manually sets the system clock.
Step3 Switch# clock update-calendar Sets the calendar.
Command Purpose
show clock [detail] Displays the system clock.