3com 3.01.01 User Manual
NTP
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Figure 6 RMON Configuration Networking
1 Configure RMON.
[SW8800-Ethernet2/1/1]rmon statistics 1 owner 3com-rmon
2 View the configurations in user view.
<SW8800>display rmon statistics Ethernet2/1/1
Statistics entry 1 owned by 3com-rmon is VALID.
Gathers statistics of interface Ethernet2/1/1. Received:
octets : 270149,packets : 1954
broadcast packets :1570 ,multicast packets:365
undersized packets :0 ,oversized packets:0
fragments packets :0 ,jabbers packets :0
CRC alignment errors:0 ,collisions :0
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.
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.
the backup server and client.
■
Referencing the same clock and guaranteeing correct processing for multiple
systems that coordinate to process a complex event.
systems that coordinate to process a complex event.
■
Guaranteeing the normal operation of the inter-system (Remote Procedure
Call).
Call).
■
Recording an application when a user logs into a system, a file is modified, or
some other operation is performed.
some other operation is performed.
Figure 7 illustrates the basic operating principle of NTP:
Console port
Network port
Switch
Internet