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
sntp-client update interval before querying again.
5 Optionally, the interval for which the SNTP client updates the real-time clock of the switch can be
changed using the following command:
config sntp-client update-interval <seconds>
The default sntp-client update-interval value is 64 seconds.
6 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.
—
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.
Table 18: Greenwich Mean Time Offsets
GMT
Offset in
Hours
GMT Offset
in Minutes
Common Time Zone
References
Cities
+0:00 +0 GMT - Greenwich Mean
UT or UTC - Universal
(Coordinated)
WET - Western European
London, England; Dublin, Ireland;
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;
-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
-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
-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