Simple Network Time Protocol (Sntp); Ip Settings - 3Com 3C10402B Administrator's Manual

36 C 2: S
HAPTER YSTEM
Simple Network Time
Protocol (SNTP)

IP Settings

S
ETTINGS
automatically. If you enter 6:00 AM and then select the US Pacific time
zone, the system adjusts the system time based on 6:00 AM and displays
the system time as 3:00 AM US Pacific.
The Simple Network Time Protocol (SNTP) synchronizes CPU clocks across
the Internet. SNTP belongs to the TCP/IP suite and works at the
Application layer in the OSI model, and uses UDP port 123 for
communication. SNTP Version 4 can operate in either unicast (point to
point), multicast (point to multipoint), or any cast (multipoint to point).
If you need to coordinate your system time with other Internet devices,
use the NBX NetSet utility to synchronize the system to an SNTP server at
a specified interval.
The initialization process initializes the SNTP client and connects to an
available SNTP server. The SNTP server provides the time, which the
system uses. When the synchronization interval expires, the system
synchronizes with the SNTP server again. Any changes to the SNTP
configuration take effect when the synchronization interval expires.
The system uses the time provided by the SNTP server for all references to
local time. This includes the time stamps used by the Call Processor,
phones, and gateways.
If the SNTP server fails, you can configure the system to transfer server
control to another active SNTP server in the list. (You have the option to
identify up to three SNTP servers to the system).
See the online Help for information about the procedure to configure the
system to use SNTP.
The IP Settings window allows you to define the network protocol
settings for this system and, if you are using IP On-The-Fly, to define the
range of IP addresses that the system can use to assign addresses to
devices as needed.
Before you configure the IP settings, you must have all necessary network
information, such as the network protocol, VLANs, Layer 3 IP information
about this Call Processor, and any DNS server addresses. This information
is propagated in the IP Settings window.
The IP Address Ranges window allows you to add or delete a range of IP
On-the-Fly addresses.