Service Manual
Dell Networking OS synchronizes with a time-serving host to get the correct time. You can set Dell Networking OS to poll specic
NTP time-serving hosts for the current time. From those time-serving hosts, the system chooses one NTP host with which to
synchronize and serve as a client to the NTP host. As soon as a host-client relationship is established, the networking device
propagates the time information throughout its local network.
Protocol Overview
The NTP messages to one or more servers and processes the replies as received. The server interchanges addresses and ports, lls
in or overwrites certain elds in the message, recalculates the checksum, and returns it immediately.
Information included in the NTP message allows each client/server peer to determine the timekeeping characteristics of its other
peers, including the expected accuracies of their clocks. Using this information, each peer is able to select the best time from
possibly several other clocks, update the local clock, and estimate its accuracy.
Figure 116. NTP Fields
Implementation Information
Dell Networking systems can only be an NTP client.
Congure the Network Time Protocol
Conguring NTP is a one-step process.
• Enabling NTP
Related Conguration Tasks
• Conguring NTP Broadcasts
• Disabling NTP on an Interface
• Conguring a Source IP Address for NTP Packets (optional)
Enabling NTP
NTP is disabled by default.
To enable NTP, specify an NTP server to which the Dell Networking system synchronizes. To specify multiple servers, enter the
command multiple times. You may specify an unlimited number of servers at the expense of CPU resources.
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System Time and Date