System Time and Date | 1023
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System Time and Date
System Time and Date settings and Network Time Protocol are supported on platforms:
e c s z
System times and dates can be set and maintained through the Network Time Protocol (NTP). They are
also set through FTOS CLIs and hardware settings.
This chapter includes the following sections:
• Network Time Protocol
• Protocol Overview
• Implementation Information
• Configuring Network Time Protocol
• FTOS Time and Date
• Configuring time and date settings
• Set daylight saving time
Network Time Protocol
Network Time Protocol (NTP) synchronizes timekeeping among a set of distributed time servers and
clients. The protocol also coordinates time distribution in a large, diverse network with a variety of
interfaces. In NTP, servers maintain the time and NTP clients synchronize with a time-serving host. NTP
clients choose from among several NTP servers to determine which offers the best available source of time
and the most reliable transmission of information.
NTP is a fault-tolerant protocol that will automatically select the best of several available time sources to
synchronize to. Multiple candidates can be combined to minimize the accumulated error. Temporarily or
permanently insane time sources will be detected and avoided.
Dell Force10 recommends configuring NTP for the most accurate time. In FTOS, other time sources can
be configured (the hardware clock and the software clock).
NTP is designed to produce three products: clock offset, roundtrip delay, and dispersion, all of which are
relative to a selected reference clock.
• Clock offset represents the amount to adjust the local clock to bring it into correspondence with the
reference clock.
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