Technical data

ServerIron ADX Administration Guide 81
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Additional system management functions
1
Activating or deactivating daylight savings time
To automatically activate and deactivate daylight savings time for the relevant time zones, enter the
following command.
ServerIronADX(config)# clock summer-time
Syntax: [no] clock summer-time
Setting the time zone
To define the time zone of the clock, enter a command such as the following.
ServerIronADX(config)# clock timezone us eastern
Syntax: [no] clock timezone gmt | us <time-zone>
The <time-zone> parameter can be any of the following:
• US time zones—alaska, aleutian, arizona, central, east-indiana, eastern, hawaii, michigan,
mountain, pacific, samoa
• GMT time zones—gmt+12, gmt+11, gmt+10...fmt+01, gmt+00, gmt-01...gmt-10, gmt-11,
gmt-12
The default is gmt + 00.
The clock timezone command is used in conjunction with the clock set command or for
timestamps obtained from a SNTP server. The clock set command is configured at the privileged
EXEC level of the CLI.
Use this clock command before all others to ensure accuracy of the clock settings. For those time
zones that recognize daylight savings time, the clock summer-time command will also need to be
defined.
Clock settings are not saved over power cycles; however, you can configure the system to reference
a SNTP server at power up. This server will then automatically download the correct time reference
for the network. The local ServerIron ADX will then adjust the time according to its time zone
setting. For more details on setting up a SNTP reference clock, refer to the sntp command at the
privileged EXEC level and the sntp poll-interval and sntp server commands at the global CONFIG
level.
DST change notice for networks using US time zones
The new Daylight Saving Time (DST) change that went into effect on March 11, 2007 affects
networks in the US time zones. Because of this change, your network clock might not be correct.
If your network uses US time zones, and it needs to maintain the correct time, you must enable the
following command.
ServerIronADX(config)# clock timezone us pacific
Syntax: clock timezone us {pacific | eastern | central | mountain}
NOTE
This command must be configured on every device that uses the US DST.
To verify the change, use the following command.