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Chapter 4 System Management
Linksys
Time Configuration Methods
The following methods are available for setting the system time on the device:
• Manual—You must manually set the time.
• SNTP—Time can be received from SNTP time servers. SNTP ensures
accurate network time synchronization of the device up to the millisecond
by using an SNTP server for the clock source. When specifying an SNTP
server, if choosing to identify it by host name, three suggestions are given
in the GUI:
• time-a.timefreq.bldrdoc.gov
• time-b.timefreq.bldrdoc.gov
• time-c.timefreq.bldrdoc.gov
After the time has been set by any of the above sources, it is not set again by
the browser.
NOTE:
SNTP is the recommended method for time setting.
Time Zone and Daylight Savings Time (DST)
The Time Zone and DST can be set on the device in the following ways:
• Dynamic configuration of the device through a DHCP server, as follows:
• Dynamic DST, when enabled and available, always takes precedence
over the manual configuration of DST.
• If the server supplying the source parameters fails, or dynamic
configuration is disabled by the user, the manual settings are used.
• Dynamic configuration of the time zone and DST continues after the IP
address lease time has expired.
• Manual configuration of the time zone and DST becomes the Operational
time zone and DST, only if the dynamic configuration is disabled or fails.
NOTE:
The DHCP server must supply DHCP option 100 in order for dynamic time
zone configuration to take place.
SNTP Modes
The device can receive the system time from an SNTP server in one of the
following ways:
• Client Multicast/Anycast Reception (passive mode) SNTP servers broadcast
the time, and the device listens to these Multicast/Anycast transmissions.
When the device is in this mode, there is no need to define a Unicast SNTP
server.
• Client Multicast/Anycast Transmission (active mode)—The device, as an
SNTP client, periodically requests SNTP time updates. This mode works in
either of the following ways:
• SNTP Anycast Client Mode—The device broadcasts time request packets
to all SNTP servers in the subnet, and waits for a response.
• Unicast SNTP Server Mode—The device sends Unicast queries to a list of
manually-configured SNTP servers, and waits for a response. The device
supports having all of the above modes active at the same time and selects
the best system time received from an SNTP server, according to an algorithm
based on the closest stratum (distance from the reference clock).
System Time
Use the System Time page to select the system time source. If the source is
manual, you can enter the time here.
CAUTION:
If the system time is set manually and the device is rebooted, the manual
time settings must be reentered.
To define system time, do the following:
STEP 1 Click Configuration > System Management > Time > System Time.
The current time on the device is displayed. This shows the DHCP time zone or
the acronym for the user-defined time zone if these were defined.
STEP 2 Enter these parameters:
Clock Source—Select the source used to set the system clock.
• SNTP—If you enable this, the system time is obtained from an SNTP server.
To use this feature, you must also configure a connection to an SNTP server
in the SNTP Unicast Server page.
Praat mee over dit product
Laat hier weten wat jij vindt van de Linksys LGS528 Switch. Als je een vraag hebt, lees dan eerst zorgvuldig de handleiding door. Een handleiding aanvragen kan via ons contactformulier.