RMON Group Name

RMON Group Code

RMON Group Number

Full Group Identifier

Description

statistics

etherStats

1

1.3.6.1.2.1.16.1

Objects that keep track of network statistics measured by the device. Example statistics include network traffic load, average packet size, number of broadcasts observed, counts of errors that have occurred, the number of packets in various size ranges and so forth.

history

history, etherHistory

2

1.3.6.1.2.1.16.2

The history group contains a single table object that controls how often statistical data is sampled by the probe. The additional etherHistory group is optional and contains extra Ethernet-specific information; it is contained logically within the history group.

alarm

alarm

3

1.3.6.1.2.1.16.3

This group defines the parameters under which an alarm may be generated to inform an administrator of an occurrence of import. The alarm group contains a table that describes the thresholds that will cause an event to be triggered (see the event group below).

hosts

host

4

1.3.6.1.2.1.16.4

Contains objects that keep track of information for each host on a network.

hostsTopN

hostTopN

5

1.3.6.1.2.1.16.5

This group contains objects that facilitate reporting of hosts sorted in a particular way. The administrator determines how these ordered statistics are tracked. For example, an administrator could generate a report listing hosts sorted by the number of packets transmitted, showing the most active devices.

matrix

matrix

6

1.3.6.1.2.1.16.6

This group keeps track of statistics for data exchanges between particular pairs of hosts. So, the amount of data sent between any two devices on the network could be tracked here. Since a large network could have thousands of such device pairs, to conserve resources on the probe, often only the most recent “conversations” between device pairs are kept in the management information base.

filter

filter

7

1.3.6.1.2.1.16.7

This RMON group allows an administrator to set up filters that control what sorts of network packets the probe will capture.

capture

buffer, capture

8

1.3.6.1.2.1.16.8

This group is used to allow a probe to capture packets based on particular parameters set up in the filter group.

event

event

9

1.3.6.1.2.1.16.9

When a particular alarm is triggered based on the parameters in the objects in the alarm group, an event is generated. This group controls how these events are processed, including creating and sending an SNMP trap message to a network monitoring station.