H3c-technologies H3C S5120 Series Switches User Manual download pdf (Page 591)

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1 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.

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H3c-technologies H3C S5120 Series Switches User Manual Page 591

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