Edge-Core ECS4620-28T Quick Start Manual page 919

To set the time shift for summer time, enter a command similar to the following.
To display the clock configuration settings, enter the following command.
Configuring SNTP
Setting the clock based on an SNTP server can provide more accurate clock
synchronization across network switches than manually-configured time. To
configure SNTP, set the switch as an SNTP client, and then set the polling interval,
and specify a time server as shown in the following example.
Configuring NTP
Requesting the time from a an NTP server is the most secure method. You can
enable NTP authentication to ensure that reliable updates are received from only
authorized NTP servers. The authentication keys and their associated key number
must be centrally managed and manually distributed to NTP servers and clients.
The key numbers and key values must match on both the server and client.
When more than one time server is configured, the client will poll all of the time
servers, and compare the responses to determine the most reliable and accurate
time update for the switch.
To configure NTP time synchronization, enter commands similar to the following.
Console(config)#clock summer-time SUMMER date 2 april 2013 0 0 30 june 2013 0
0
Console(config)#
Console#show calendar
Current Time
Time Zone
Summer Time
Summer Time in Effect : Yes
Console#
Console(config)#sntp client
Console(config)#sntp poll 60
Console(config)#sntp server 10.1.0.19
Console(config)#exit
Console#show sntp
Current Time : Apr 2 16:06:07 2013
Poll Interval : 60 seconds
Current Mode : Unicast
SNTP Status : Enabled
SNTP Server : 10.1.0.19
Current Server : 10.1.0.19
Console#
Console(config)#ntp client
Console(config)#ntp authentication-key 45 md5 thisiskey45
Console(config)#ntp authenticate
Console(config)#ntp server 192.168.3.20
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Chapter 1
: Apr 2 15:56:12 2013
: UTC, 08:00
: SUMMER, offset 60 minutes
Apr 2 2013 00:00 to Jun 30 2013 00:00
| Initial Switch Configuration
Setting the System Clock