Extreme Networks ExtremeWare XOS 10.1, Руководство пользователя

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50 ExtremeWare XOS 10.1 Concepts Guide
Managing the Switch
Automatic Daylight Savings Time (DST) changes can be enabled or disabled. The default setting is
enabled. To disable automatic DST, use the command:
configure timezone {name <std_timezone_ID>} <GMT_offset> noautodst
3
Enable the SNTP client using the following command:
enable sntp-client
After it has been enabled, the switch sends out a periodic query to the NTP servers defined later (if
configured) or listens to broadcast NTP updates from the network. The network time information is
automatically saved into the on-board real-time clock.
4 If you would like this switch to use a directed query to the NTP server, configure the switch to use
the NTP server(s). If the switch listens to NTP broadcasts, skip this step. To configure the switch to
use a directed query, use the following command:
configure sntp-client [primary | secondary] <host-name-or-ip>
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:
configure sntp-client update-interval <update-interval>
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 {detail}
This command indicates the GMT offset, the Daylight Savings Time configuration and status, 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 9 describes GMT offsets.
absolute_day Specifies a specific day of a specific year on which to begin or end DST. Format is:
<month> <day> <year> where:
• <month> is specified as 1-12
• <day> is specified as 1-31
• <year> is specified as 1970 - 2035
The year must be the same for the begin and end dates.
time_of_day_hour Specifies the time of day to begin or end Daylight Savings Time. May be specified as an
hour (0-23). Default is 2.
time_of_day_minutes Specify the minute to begin or end Daylight Savings Time. May be specified as a minute
(0-59).
noautodst Disables automatic Daylight Savings Time.
Table 8: Time zone configuration command options (continued)