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TRENDnet User’s Guide
Industrial Managed Switch Series
22
SNTP
The Network Time Protocol (NTP) is a protocol for synchronizing the clocks of computer
systems over packet-switched, variable-latency data networks. A less complex
implementation of NTP, using the same protocol but without requiring the storage of
state over extended periods of time is known as the Simple Network Time Protocol
(SNTP). NTP provides Coordinated Universal Time (UTC). No information about time
zones or daylight saving time is transmitted; this information is outside its scope and must
be obtained separately.
UDP Port: 123.
Daylight saving is a period from late spring to early fall when many countries set their
clocks ahead of normal local time by one hour to give more daytime light in the evening.
Note:
1. The SNTP server always replies the UTC current time.
2. When the Switch receives the SNTP reply time, the Switch will adjust the time
with the time zone configuration and then configure the time to the Switch.
3. If the time server’s IP address is not configured, the Switch will not send any
SNTP request packets.
4. If no SNTP reply packets, the Switch will retry every 10 seconds forever.
5. If the Switch has received SNTP reply, the Switch will re-get the time from NTP
server every 24 hours.
6. If the time zone and time NTP server have been changed, the Switch will
repeat the query process.
7. No default SNTP server.
Default Settings
Current Time:
-----------------------------------------------
Time: 0:3:51 (UTC)
Date: 1970-1-1
Time Server Configuration:
-----------------------------------------------
Time Zone : +00:00
IP Address: 0.0.0.0
DayLight Saving Time Configuration:
-----------------------------------------------
State : disabled
Start Date: None.
End Date : None.
CLI Configuration
Node Command Description
enable show time This command displays current time
and time configurations.
configure time HOUR:MINUTE:SECOND Sets the current time on the Switch.
hour: 0-23
min: 0-59
sec: 0-59
Note: If you configure Daylight Saving
Time
after you configure the time, the
Switch will apply Daylight Saving Time.
configure time date YEAR/MONTH/DAY Sets the current date on the Switch.
year: 1970-
month: 1-12
day: 1-31
configure time daylight-saving-time This command enables the daylight
saving time.
configure time daylight-saving-time
start-date (first | second |
third | fourth | last) (Sunday
| Monday | Tuesday | This command sets the start date for
the Daylight Saving Time.
For Example: first Sunday 4 0 (AM:0 1st
Sunday in April)