Introduction 1 - 3
RMON Client
The RMON Client consists of a management station running an application
that uses SNMP (such as the 3Com ONdemand LANsentry™ software) to
request data from the probe and display that data in various formats. You
can also use the graphical interface to configure the RMON agent.
The client application does not have to be located on the same segments as
the network to which the probe is assigned, but does need connectivity to
the networks.
Ethernet RMON Groups
The Ethernet RMON standard is defined in Request For Comment (RFC)
1757 (formerly 1271). The goal of the standard is to ensure interoperability
in multivendor environments. As defined by the RFC standards for Ethernet
RMON, the Ethernet RMON specification identifies the following RMON
groups:
❑ Alarm Group - Allows you to define and set thresholds for various
counters. If a counter reaches a predefined threshold, an event is
generated. (See Event Group below.)
❑ Event Group - Controls the action taken as a result of an event, (an
event can be triggered by an alarm). For example, if a counter
reaches a threshold, then a trap may be generated or an event may
be logged.
❑ Filter Group - Instructs the RMON MultiProbe Module to capture
only those packets that match a specific criteria (such as IP Protocol
or a specific MAC address).
❑ History Group - Provides historical views of statistics based on
predefined sampling intervals. This information illustrates traffic or
error patterns, which can be useful in trend analysis.
❑ Host Group - Contains statistical counters, grouped by MAC address,
specific to each station on the network. This group also contains the
order in which devices or stations were discovered.
