Operation Manual - System Management
Quidway S6500 Series Ethernet Switches Chapter 7 NTP Configuration
Huawei Technologies Proprietary
7-1
Chapter 7 NTP Configuration
7.1 Brief Introduction to NTP
7.1.1 NTP Functions
As the network topology gets more and more complex, it becomes important to
synchronize the clocks of the equipment on the whole network. NTP (Network Time
Protocol) is an application layer protocol of TCP/IP protocol suite and used for
advertising the accurate time throughout the network.
NTP ensures the consistency of the following applications:
z For the incremental backup between the backup server and client, NTP ensures
the clock synchronization between the two systems.
z For multiple systems that coordinate to process a complex event, NTP ensures
them to reference the same clock and guarantee the right order of the event.
z Guarantee the normal operation of the inter-system (Remote Procedure Call).
z Record for an application when a user logs in to a system, a file is modified, or
some other operation is performed.
7.1.2 Basic Operating Principle of NTP
The following figure illustrates the basic operating principle of NTP:
Network
Network
NTP Packet 10:00:00am
Network
Network
11:00:01am
10:00:00am 11:00:01am 11:00:02am
10:00:00am
NTP Packet received at 10:00:03
1.
2.
3.
4.
LS_A
LS_A
LS_A
LS_A
LS_B
LS_B
LS_B
LS_B
NTP Packet
NTP Packet
Network
Network
NTP Packet 10:00:00 am
Network
Network
11:00:01 am
10:00:00 am 11:00:01 am 11:00:02 am
10:00:00 am
NTP Packet received at 10:00:03 am
1.
2.
3.
4.
LS_A
LS_A
LS_A
LS_A
LS_B
LS_B
LS_B
LS_B
NTP Packet
NTP Packet
Network
Network
NTP Packet 10:00:00am
Network
Network
11:00:01am
10:00:00am 11:00:01am 11:00:02am
10:00:00am
NTP Packet received at 10:00:03
1.
2.
3.
4.
LS_A
LS_A
LS_A
LS_A
LS_B
LS_B
LS_B
LS_B
NTP Packet
NTP Packet
Network
Network
NTP Packet 10:00:00 am
Network
Network
11:00:01 am
10:00:00 am 11:00:01 am 11:00:02 am
10:00:00 am
NTP Packet received at 10:00:03 am
1.
2.
3.
4.
LS_A
LS_A
LS_A
LS_A
LS_B
LS_B
LS_B
LS_B
NTP Packet
NTP Packet
Figure 7-1 Basic operating principle of NTP
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