23 NTP Configuration
23.1 Unerstanding NTP
Network Time Protocol (NTP) is a protocol for the time synchronization of network devices. It
is designed to synchronize the network devices with the server or clock source, to provide
high accurate time correction (less than one millisecond on the LAN an dozens of
milliseconds on the WAN, compared with the standard time), and to prevent from attack by
the means of encryption and confirmation.
To provide accurate time, NTP needs precise time source, which should be the Coordinated
Universal Time (UTC). The NTP may obtain the time source of UTC from the atom clock, the
observatory, the satellite or the Internet. Thus, accurate and reliable time source is available.
To prevent the time server from malicious destroying, an Authentication mechanism is used
by the NTP to check whether the request of time correcting really comes from the declared
server, and check the returning path of data. This mechanism provides protection of
anti-interference.
As a simplified version of NTP, SNTP has the identical message format. The difference is
that SNTP simplifies the algorithm of time correction and neglects many possible factors
resulting in errors. Therefore, SNTP is not as good as NTP in respect of precision. The
SNTP does not support the security authentication mechanism. The switch supports the
NTP for the client at present, that is, the time can be synchronized according to the time
server.
23.2 Configuring NTP
This chapter describes how to configure the NTP client in the system implementation.
Configuring Global Security Authentication Mechanism for the NTP
Configuring Global Authentication Key for the NTP
Configuring Global Trusted Key ID for the NTP
Configuring NTP Server
Disabling receiving NTP Packets on the Interface
Enabling/Disabling NTP Function
Configuring Real Time Synchronization for NTP
To Next Page
Loading...
Need help?
General