User's Manual

404 CHAPTER 10: RMON
Key Concepts The following section describes the key concepts of RMON and the
support provided by 3Com Network Director.
What is RMON RMON (Remote Monitoring) is a network management standard that
allows a centralized management application to gather information
about the network from distributed network devices. The RMON
standard breaks this information into various groups, each of which
allows a management application to monitor the network in various
different ways.
The five most commonly used RMON groups are:
■ Statistics
■ History
■ Host
■ HostTopN
■ Matrix
Statistics
The Statistics group defines a standard by which a network device can
make available information on current activity on each of its monitored
interfaces and VLANs.
Gathered information includes:
■ transmitted and received packets
■ transmitted and received bytes
■ various types of errors
■ received multicast packets
■ packet size distributions
The information in the Statistics group allows you to monitor what is
happening on your network in real time.
History
The History group complements the Statistics group. It presents the same
information as the Statistics group, but gathered historically over time.