Extreme 3804 User Guide
68
Summit24e3 Switch Installation and User Guide
Managing the Switch
NTP queries are first sent to the primary server. If the primary server does not respond within 1
second, or if it is not synchronized, the switch queries the secondary server (if one is configured). If
the switch cannot obtain the time, it restarts the query process. Otherwise, the switch waits for the
second, or if it is not synchronized, the switch queries the secondary server (if one is configured). If
the switch cannot obtain the time, it restarts the query process. Otherwise, the switch waits for the
sntp-client update interval
before querying again.
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Optionally, the interval for which the SNTP client updates the real-time clock of the switch can be
changed using the following command:
changed using the following command:
config sntp-client update-interval <seconds>
The default
sntp-client update-interval
value is 64 seconds.
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You can verify the configuration using the following commands:
—
show sntp-client
This command provides configuration and statistics associated with SNTP and its connectivity to
the NTP server.
the NTP server.
—
show switch
This command indicates the GMT offset, Daylight Savings Time, and the current local time.
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 18 describes GMT offsets.
timestamp information, the switch should be configured with the appropriate offset to GMT based on
geographical location. Table 18 describes GMT offsets.
Table 18: Greenwich Mean Time Offsets
GMT
Offset in
Hours
Offset in
Hours
GMT Offset
in Minutes
in Minutes
Common Time Zone
References
References
Cities
+0:00
+0
GMT - Greenwich Mean
UT or UTC - Universal
(Coordinated)
(Coordinated)
WET - Western European
London, England; Dublin, Ireland;
Edinburgh, Scotland; Lisbon,
Portugal; Reykjavik, Iceland;
Casablanca, Morocco
Edinburgh, Scotland; Lisbon,
Portugal; Reykjavik, Iceland;
Casablanca, Morocco
-1:00
-60
WAT - West Africa
Azores, Cape Verde Islands
-2:00
-120
AT - Azores
-3:00
-180
Brasilia, Brazil; Buenos Aires,
Argentina; Georgetown, Guyana;
Argentina; Georgetown, Guyana;
-4:00
-240
AST - Atlantic Standard
Caracas; La Paz
-5:00
-300
EST - Eastern Standard
Bogota, Columbia; Lima, Peru;
New York, NY, Trevor City, MI
USA
New York, NY, Trevor City, MI
USA
-6:00
-360
CST - Central Standard
Mexico City, Mexico
-7:00
-420
MST - Mountain Standard
Saskatchewan, Canada
-8:00
-480
PST - Pacific Standard
Los Angeles, CA, Cupertino, CA,
Seattle, WA USA
Seattle, WA USA
-9:00
-540
YST - Yukon Standard
-10:00
-600
AHST - Alaska-Hawaii Standard
CAT - Central Alaska
HST - Hawaii Standard
-11:00
-660
NT - Nome
-12:00
-720
IDLW - International Date Line
West
West