3Com 10014298 manual Ntp

278CHAPTER 11: SYSTEM MANAGEMENT

Dropped packet events (due to				lack of resources):0
Packets received		according	to	length (in octets):
64	:644	, 65-127	:518		, 128-255	:688

256-511:101 , 512-1023:3 , 1024-1518:0

NTP	As the network topology gets more and more complex, it becomes important to
	synchronize the clocks of the equipment on the entire network. Network Time
	Protocol (NTP) is a TCP/IP feature that advertises the accurate time throughout the
	network.

NTP ensures the consistency of the following applications:

■Synchronizing the clock between two systems for incremental backup between the backup server and client.

■Referencing the same clock and guaranteeing correct processing for multiple systems that coordinate to process a complex event.

■Guaranteeing the normal operation of the inter-system (Remote Procedure Call).

■Recording an application when a user logs into a system, a file is modified, or some other operation is performed.

Figure 65 illustrates the basic operating principle of NTP:

Figure 65 Basic Operating Principle of NTP

In Figure 65, Ethernet Switch A and Ethernet Switch B are connected to the Ethernet port. They have independent system clocks. Before implementing automatic clock synchronization on both switches. Note that:

■Before synchronizing the system clocks on Ethernet Switch A and B, the clock on Ethernet Switch A is set to 10:00:00am, and the clock on B is set to 11:00:00am.