Netgear S3300-28X-PoE+ (GS728TXP) - ProSAFE S3300 Smart Switch Series 管理者ガイド
Configure System Information
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S3300 Smart Switch
Time
The switch supports the Simple Network Time Protocol (SNTP). You can also set the system
time manually.
time manually.
SNTP assures accurate network device clock time synchronization up to the millisecond.
Time synchronization is performed by a network SNTP server. The switch software operates
only as an SNTP client and cannot provide time services to other systems.
Time synchronization is performed by a network SNTP server. The switch software operates
only as an SNTP client and cannot provide time services to other systems.
Time sources are established by stratums. Stratums define the accuracy of the reference
clock. The higher the stratum (where zero is the highest), the more accurate the clock. The
device receives time from stratum 1 and above since it is itself a stratum 2 device.
clock. The higher the stratum (where zero is the highest), the more accurate the clock. The
device receives time from stratum 1 and above since it is itself a stratum 2 device.
Information received from SNTP servers is evaluated based on the time level and server
type. SNTP time definitions are assessed and determined by the following time levels:
type. SNTP time definitions are assessed and determined by the following time levels:
•
T1. Time at which the original request was sent by the client.
•
T2. Time at which the original request was received by the server.
•
T3. Time at which the server sent a reply.
•
T4. Time at which the client received the server’s reply.
The device can poll Unicast server types for the server time.
Polling for unicast information is used for contacting a server for which the IP address is
known. SNTP servers that have been configured on the device are the only ones that are
polled for synchronization information. T1 through T4 are used to determine server time. This
is the preferred method for synchronizing device time because it is the most secure method.
If this method is selected, SNTP information is accepted only from SNTP servers defined on
the device using the SNTP Server Configuration screen.
known. SNTP servers that have been configured on the device are the only ones that are
polled for synchronization information. T1 through T4 are used to determine server time. This
is the preferred method for synchronizing device time because it is the most secure method.
If this method is selected, SNTP information is accepted only from SNTP servers defined on
the device using the SNTP Server Configuration screen.
The device retrieves synchronization information, either by actively requesting information or
at every poll interval.
at every poll interval.
Time Configuration
Use the Time Configuration screen to view and adjust date and time settings.
To manually configure the time:
1.
Select System
Management
Time
Time Configuration.
2.
Next to Clock Source, select Local.
3.
In the Date field, enter the date in the DD/MM/YYYY format.
4.
In the Time field, enter the time in HH:MM:SS format.
Note:
If you do not enter a date and time, the switch will calculate the date
and time using the CPU’s clock cycle.
and time using the CPU’s clock cycle.
5.
Click the Apply button.