Extreme Networks ExtremeWare 7.2e, Installation And User Manual

Page: 65 / 344

Using the Simple Network Time Protocol
ExtremeWare 7.2e Installation and User Guide 65
Configuring and Using SNTP
To use SNTP, follow these steps:
1
Identify the host(s) that are configured as NTP server(s). Additionally, identify the preferred method
for obtaining NTP updates. The options are for the NTP server to send out broadcasts, or for
switches using NTP to query the NTP server(s) directly. A combination of both methods is possible.
You must identify the method that should be used for the switch being configured.
2 Configure the Greenwich Mean Time (GMT) offset and Daylight Saving Time preference. The
command syntax to configure GMT offset and usage of Daylight Saving Time is as follows:
configure timezone {name <std_timezone_ID>} <GMT_offset> {autodst {name
<dst_timezone_ID>} {<dst_offset>} {begins [every <floatingday> | on <absoluteday>]
{at <time_of_day>} {ends [every <floatingday> | on <absoluteday>] {at
<time_of_day>}}} | noautodst}
By default, Daylight Saving Time is assumed to begin on the first Sunday in April at 2:00 AM, and
end the last Sunday in October at 2:00 AM, and be offset from standard time by one hour. If this is
the case in your timezone, you can set up automatic daylight savings adjustment with the command:
configure timezone <GMT_offset> autodst
If your timezone uses starting and ending dates and times that differ from the default, you can
specify the starting and ending date and time in terms of a floating day, as follows:
configure timezone name MET 60 autodst name MDT begins every last sunday march at
1 ends every last sunday october at 1
You can also specify a specific date and time, as shown in the following command.
configure timezone name NZST 720 autodst name NZDT 60 begins every first sunday
october at 2 ends on 3/16/2002 at 2
The optional timezone IDs are used to identify the timezone in display commands such as
show
switch
.
Table 14 describes the command options in detail:
Table 14: Time Zone Configuration Command Options
GMT_offset Specifies a Greenwich Mean Time (GMT) offset, in + or - minutes.
std-timezone-ID Specifies an optional name for this timezone specification. May be up to six characters in
length. The default is an empty string.
autodst Enables automatic Daylight Savings Time.
dst-timezone-ID Specifies an optional name for this DST specification. May be up to six characters in
length. The default is an empty string.
dst_offset Specifies an offset from standard time, in minutes. Value is in the range of 1 to 60.
Default is 60 minutes.
floating_day Specifies the day, week, and month of the year to begin or end DST each year. Format is:
<week><day><month> where:
• <week> is specified as [first | second | third | fourth | last] or 1-5
• <day> is specified as [sunday | monday | tuesday | wednesday | thursday | friday |
saturday] or 1-7 (where 1 is Sunday)
• <month> is specified as [january | february | march | april | may | june | july | august |
september | october | november | december] or 1-12
Default for beginning is first sunday april; default for ending is last sunday october.