Extreme Networks ExtremeWare XOS Command Reference Manual page 49

Usage Guidelines
Network Time Protocol (NTP) server updates are distributed using GMT time. To properly display the
local time in logs and other timestamp information, the switch should be configured with the
appropriate offset to GMT based on geographic location.
The
gmt_offset
Automatic DST changes can be enabled or disabled. The default configuration, where DST begins on the
first Sunday in April at 2:00 AM and ends the last Sunday in October at 2:00 AM, applies to most of
North America, and can be configured with the following syntax:
configure timezone <gmt_offst> autodst
The starting and ending date and time for DST may be specified, as these vary in time zones around the
world.
• Use the
every
Sunday in March every year)
• Use the
on
option, you will need to specify the command again every year.
• The
begins
• The
ends
• The
ends
in the Southern Hemisphere.
• If you specify only the starting or ending time (not both) the one you leave unspecified will be reset
to its default.
• The
time_of_day
• The timezone IDs are optional. They are used only in the display of timezone configuration
information in the
To disable automatic DST changes, re-specify the GMT offset using the
configure timezone <gmt_offst> noautodst.
NTP updates are distributed using GMT time. To properly display the local time in logs and other
timestamp information, the switch should be configured with the appropriate offset to GMT based on
geographical location. Table 5 describes the GMT offsets.
Table 5: Greenwich Mean Time offsets
GMT Offset
in Hours
+0:00
-1:00
-2:00
-3:00
-4:00
ExtremeWare XOS 11.0 Command Reference Guide
is specified in +/- minutes from the GMT time.
keyword to specify a year-after-year repeating set of dates (for example, the last
keyword to specify a non-repeating, specific date for the specified year. If you use this
specification defaults to
specification defaults to
date may occur earlier in the year than the
specification defaults to
command.
show switch
GMT Offset
in Minutes Common Time Zone References
+0 GMT - Greenwich Mean
UT or UTC - Universal (Coordinated)
WET - Western European
-60 WAT - West Africa
-120 AT - Azores
-180
-240 AST - Atlantic Standard
.
every first sunday april
every last sunday october
begins
2:00.
.
.
date. This will be the case for countries
option:
noautodst
Cities
London, England; Dublin, Ireland;
Edinburgh, Scotland; Lisbon, Portugal;
Reykjavik, Iceland; Casablanca, Morocco
Cape Verde Islands
Azores
Brasilia, Brazil; Buenos Aires, Argentina;
Georgetown, Guyana;
Caracas; La Paz
configure timezone
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