HP Cisco MDS 9120 Cisco MDS 9000 Family CLI Configuration Guide - Release 4.x - Page 169

Chapter 5 Initial Configuration NTP Configuration Send documentation comments to [email protected] Step 3 Step 4 Step 5 Command Purpose 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 Sets the daylight savings time for a specified time zone. The start and end values are as follows: • Week ranging from 1 through 5 Example: switch(config)# clock summer-time PDT 2 Sunday March 02:00 1 Sunday November 02:00 60 switch(config)# • 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 second Sunday in March at 2 a.m. and ending the first Sunday in November at 2 a.m. switch(config)# no clock summer-time Disables the daylight saving time adjustment feature. switch(config)# exit switch# Returns to EXEC mode. switch# show running-config | include summer-time Verifies the time zone configuration. If summer-time is not part of the running configuration, then the switch is not configured for daylight saving time. In 2007, the U. S. the daylight Daylight saving time adjustment occurs on the second Sunday in March 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 02:00 1 Sunday November 02:00 60 Note CFS does not support daylight savings time because a single fabric can span multiple time zones; every switch must be configured individually. If you want to configure daylight savings time on multiple switches simultaneously, see the RUN CLI command feature in the Cisco MDS 9000 Family Fabric Manager Configuration Guide. 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 Universal Time Coordinated (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. This section includes the following sections: • About NTP, page 5-20 OL-18084-01, Cisco MDS NX-OS Release 4.x Cisco MDS 9000 Family CLI Configuration Guide 5-19