Rmon groups, Ethernet statistics group, History group – H3C Technologies H3C WX6000 Series Access Controllers User Manual

Page 106: Event group

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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.

H3C devices adopt the second way and realize the RMON agent function. With the RMON agent

function, the management device can monitor all the traffic sent and received between 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 device has realized the

statistics group, history group, event group, and alarm group supported by the public MIB. Besides,

H3C also defines and implements the private alarm group, which enhances the functions of the alarm

group. This section briefly describes the five kinds of groups.

Ethernet statistics group

The statistics group defines that the system collects statistics on various traffic information on an

interface (at present, only Ethernet interfaces are supported) and saves the statistics in the Ethernet

statistics table (ethernetStatsTable) for query convenience of the management device. It provides

statistics about network collisions, CRC alignment errors, undersize/oversize packets, broadcasts,

multicasts, bytes received, packets received, and so on.

After the creation of a statistics entry on an interface, the statistics group starts to collect traffic statistics

on the interface. The result of the statistics is a cumulative sum.

History group

The history group defines that the system periodically collects statistics on traffic information on an

interface and saves the statistics in the history record table (ethernetHistoryTable) for query

convenience of the management device. The statistics data includes bandwidth utilization, number of

error packets, and total number of packets.

A history group collects statistics on packets received on the interface during each period, which can be

configured through the command line interface (CLI).

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:

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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.

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

(NMS).

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

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None: No action

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