Cisco Nexus 5000 Series - NTP Configuration; About Ntp

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
OL-16597-01
Chapter 1 Configuring the Switch
NTP Configuration
The following 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# configure terminal
switch(config)# clock summer-time PDT 1 Sunday March 02:00 1 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 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 1-15
• NTP Configuration Guidelines, page 1-16
• Configuring NTP, page 1-17
• NTP CFS Distribution, page 1-17
About NTP
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.
Command Purpose
Step 1
switch# configure terminal
Enters configuration mode.
Step 2
switch(config)# clock summer-time
timezone start_week start_day
start_month start_time end_week
end_day end_month end_time offset
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.
switch(config)# no clock summer-time
Disables the daylight saving time adjustment feature.
Step 3
switch(config)# exit
switch#
Returns to EXEC mode.
Step 4
switch# show running-config | include
summer-time
Verifies the time zone configuration.