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Configuring Date and Time
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
Command
Step 3
switch(config)# clock summer-time
daylight_timezone_name start_week
start_day start_month start_time end_week
end_day end_month end_time
daylight_offset_inminutes
Example:
switch(config)# clock summer-time PDT 1
Sunday April 02:00 5 Sunday October 02:00
60
switch(config)#
switch(config)# no clock summer-time
Step 4
switch(config)# exit
switch#
Step 5
switch# show running-config | include
summer-time
In 2007, the U. S. the daylight saving time adjustment changes to start on the second Sunday in March
Note
and end on the first Sunday in November. You can update the configuration of your switch to
accommodate this change using the following command:
switch(config)# clock summer-time daylight_timezone_name 2 Sunday March 1 02:00 Sunday
November 02:00 60
NTP Configuration
A Network Time Protocol (NTP) server provides a precise time source (radio clock or atomic clock) to
synchronize the system clocks of network devices. NTP is transported over User Datagram Protocol
UDP/IP. All NTP communications use UTC. An NTP server receives its time from a reference time
source, such as a radio clock or atomic clock, attached to the time. NTP distributes this time across the
network.
In a large enterprise network, having one time standard for all network devices is critical for management
reporting and event logging functions when trying to correlate interacting events logged across multiple
devices. Many enterprise customers with extremely mission-critical networks maintain their own
stratum-1 NTP source.
Time synchronization happens when several frames are exchanged between clients and servers. The
switches in client mode know the address of one or more NTP servers. The servers act as the time source
and receive client synchronization requests.
Cisco MDS 9000 Family Configuration Guide
4-18
Chapter 4
Purpose
Sets the daylight savings time for a specified time
zone.
The start and end values are as follows:
Week ranging from 1 through 5
•
Day ranging from Sunday through Saturday
•
Month ranging from January through
•
December
The daylight offset ranges from 1 through 1440
minutes, which are added to the start time and
deleted time from the end time.
This example adjusts the daylight savings time for
the U.S. Pacific daylight time by 60 minutes starting
the first Sunday in April at 2 a.m. and ending the last
Sunday in October at 2 a.m.
Disables the daylight saving time adjustment
feature.
Returns to EXEC mode.
Verifies the time zone configuration.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
Initial Configuration
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