H3C Technologies H3C S5120 Series Switches - Manual (Page 591)

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RMON Configuration
When configuring RMON, go to these sections for information you are interested in:
z RMON Overview
z Configuring the RMON Statistics Function
z Configuring the RMON Alarm Function
z Displaying and Maintaining RMON
z RMON Configuration Example (Logging Information)
z RMON Configuration Example (Sending Traps)
RMON Overview
This section covers these topics:
z Introduction
z RMON Groups
Introduction
Remote Monitoring (RMON) is used to realize the monitoring and management from the management
devices to the managed devices on the network by implementing such functions as statistics and alarm.
The statistics function enables a managed device to periodically or continuously track various traffic
information on the network segments connecting to its ports, such as total number of received packets
or total number of oversize packets received. The alarm function enables a managed device to monitor
the value of a specified MIB variable, log the event and send a trap to the management device when the
value reaches the threshold, such as the port rate reaches a certain value or the potion of broadcast
packets received in the total packets reaches a certain value.
Both the RMON protocol and the Simple Network Management Protocol (SNMP) are used for remote
network management:
z RMON is implemented on the basis of the SNMP, which is thus enhanced. RMON sends traps to
the management device to notify the abnormality of the alarm variables by using the SNMP trap
packet sending mechanism. Although trap is also defined in SNMP, it is usually used to notify the
management device whether some functions on managed devices operate normally and the
change of physical status of interfaces. Traps in RMON and those in SNMP have different
monitored targets, triggering conditions, and report contents.
z RMON provides an efficient means of monitoring subnets and allows SNMP to monitor remote
network devices in a more proactive and effective way. The RMON protocol defines that when an
alarm threshold is reached on a managed device, the managed device sends a trap to the
management device automatically, so the management device has no need to get the values of
MIB variables for multiple times and compare them, and thus greatly reducing the communication
traffic between the management device and the managed device. In this way, you can manage a
large scale of network easily and effectively.