User Manual

24-Port and 48-Port Gigabit Ethernet PoE+ Smart Switches with 4 SFP Ports
Configure System Information User Manual69
You can set the local clock to SNTP only if the following two conditions are met:
• The SNTP server is configured.
• The SNTP last attempt status is successful.
8. In the T
ime Zone Name field, specify a time zone.
In the Offset Hours and Offset Minutes fields, you can also specify the number of hours
and number of minutes that the time zone is dif
ferent from the Coordinated Universal
Time (UTC). The time zone can affect the display of the current system time. The default
value is UTC.
Note: When you use an SNTP or NTP time server, the time data that is
received from the server is based on the UTC, which is the same as
Greenwich Mean Time (GMT). This might not be the time zone in
which the switch is located.
9. In the Offset Hours field, specify the number of hours that the time zone is dif
ferent from
UTC.
The allowed range is –12 to 13. The default value is 0.
10. In the Offset Minutes field, specify the number of minutes that the time zone is dif
ferent
from UTC.
The allowed range is 0 to 59. The default value is 0.
11. Next to Client Mode, select the mode of operation of the SNTP client:
• Unicast. SNTP operates in a point-to-point fashion.
A unicast client sends a request
to a designated server at its unicast address and expects a reply from which it can
determine the time and, optionally, the round-trip delay and local clock offset relative
to the server.
• Broadcast. SNTP operates in the same manner as multicast mode but uses a local
broadcast address instead of a multicast address.
The broadcast address provides a
single-subnet scope while a multicast address provides an Internet-wide scope.
The default value is Unicast.
12. If the SNTP client mode is Unicast, use the SNTP Server Configuration page to add the IP
address or DNS name of one or more SNTP servers for the switch to poll.
For more information, see
Configure an SNTP server on page 72.
13. In the Port field, specify the local UDP port that the SNTP client receives server packets on.
The allowed range is 1025 to 65535 and 123. The default value is 123. When the default
value is configured, the actual client port value used in SNTP packets is assigned by the
operating system.
14. In the Unicast Poll Interval field, specify the number of seconds between unicast poll
requests expressed as a power of 2. to
The allowed range is 6 to 10. The default value is 6.