3com 3031 Instruccion De Instalación
9
NTP C
ONFIGURATION
This chapter covers the following topics:
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Introduction
NTP (Network Time Protocol) is the TCP/IP protocol used to advertise precise time
in the entire network. Its transmission is based on the UDP. The basic principle is
illustrated in the following figures:
in the entire network. Its transmission is based on the UDP. The basic principle is
illustrated in the following figures:
Figure 15 NTP basic principle diagram
The above figure displays NTP basic operating principle. Router A and Router B are
connected via the serial port. Both of them have their own independent system
clock. To implement automatic synchronization of their system clocks, suppose:
connected via the serial port. Both of them have their own independent system
clock. To implement automatic synchronization of their system clocks, suppose:
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Before the system clocks of Router A and Router B are synchronized, the clock
of Router A is set to 10:00:00am and the clock of Router B is set to
11:00:00am.
of Router A is set to 10:00:00am and the clock of Router B is set to
11:00:00am.
Router A
Router B
Router A
Router B
NetWork
NTP Packets 10:00:00 am
Router A
Router B
NetWork
Router A
Router B
NetWork
11:00:01 am
NTP Packets 10:00:00 am
11:00:01 am
11:00:02 am
NTP Packets 10:00:00 am
NTP Packet received at 10:00:03
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NetWork