H3c-technologies H3C S5120 Series Switches User Manual download pdf (Page 592)

100

101

1-2

Working Mechanism

RMON allows multiple monitors (management devices). A monitor provides two ways of data gathering:

z Using RMON probes. Management devices can obtain management information from RMON

probes directly and control network resources. In this approach, management devices can obtain

all RMON MIB information.

z Embedding RMON agents in network devices such as routers, switches, and hubs to provide the

RMON probe function. Management devices exchange data with RMON agents using basic SNMP

operations to gather network management information, which, due to system resources limitation,

may not cover all MIB information but four groups of information, alarm, event, history, and

statistics, in most cases.

The H3C device adopts the second way and realizes the RMON agent function.

With the RMON agent

function, the management device can monitor all the traffic flowing among the managed devices on all

connected LAN segments; obtain information about error statistics and performance statistics for network

management.

RMON Groups

Among the RMON groups defined by RMON specifications (RFC 2819), the realized public MIB of the

device supports the event group, alarm group, history group and statistics group. Besides, H3C also

defines and implements the private alarm group, which enhances the functions of the alarm group. This

section describes the five kinds of groups in general.

Event group

The event group defines event indexes and controls the generation and notifications of the events

triggered by the alarms defined in the alarm group and the private alarm group. The events can be

handled in one of the following ways:

z Log: Logging event related information (the occurred events, contents of the event, and so on) in

the event log table of the RMON MIB of the device, and thus the management device can check the

logs through the SNMP Get operation.

z Trap: Sending a trap to notify the occurrence of this event to the network management station

(NMS).

z Log-Trap: Logging event information in the event log table and sending a trap to the NMS.

z None: No action

Alarm group

The RMON alarm group monitors specified alarm variables, such as total number of received packets

(etherStatsPkts) on an interface. After you define an alarm entry the system gets the value of the

monitored alarm variable at the specified interval, when the value of the monitored variable is greater

than or equal to the upper threshold, an upper event is triggered; when the value of the monitored

variable is smaller than or equal to the lower threshold, a lower event is triggered. The event is then

handled as defined in the event group.

1 2 ... 587 588 589 590 591 592 593 594 595 596 597 ... 744 745

Comments to this Manuals

No comments

H3c-technologies H3C S5120 Series Switches User Manual Page 592

Comments to this Manuals

Related products and manuals for Routers H3c-technologies H3C S5120 Series Switches