About The Rmon Groups - 3Com 3C16685 User Manual

122 A C: RMON
PPENDIX

About the RMON Groups

The IETF define nine groups of Ethernet RMON statistics. This section
describes these groups, and details how they can be used.
Statistics
The Statistics group provides traffic and error statistics showing
packets, bytes, broadcasts, multicasts and errors on a LAN segment.
Information from the Statistics group is used to detect changes in
traffic and error patterns in critical areas of your network.
History
The History group provides historical views of network performance
by taking periodic samples of the counters supplied by the Statistics
group. The group features user-defined sample intervals and bucket
counters for complete customization of trend analysis.
The group is useful for analysis of traffic patterns and trends on a
LAN segment, and to establish baseline information indicating
normal operating parameters.
Alarms
The Alarms group provides a versatile, general mechanism for setting
thresholds and sampling intervals to generate events on any counter
or integer variable. Both rising and falling thresholds are supported,
and thresholds can be on the absolute value of a variable or its delta
value. In addition, the 3Com SmartAgent allows alarm thresholds to
be autocalibrated.
Alarms are used to inform you of a network performance problem
and they can trigger automated action responses through the Events
group.
Hosts
The Hosts group specifies a table of traffic and error statistics for
each host on a LAN segment. Statistics include packets sent and
received, octets sent and received, as well as broadcasts, multicasts,
and error packets sent.
The group supplies a simple discovery mechanism listing all hosts that
have transmitted. The next group, Hosts Top N, requires
implementation of the Hosts group.