3Com 3C16685 User Manual page 123

What is RMON? 123
Hosts Top N
The Hosts Top N group extends the Hosts table by providing sorted
host statistics, such as the top 20 nodes sending packets or an
ordered list of all nodes according to the errors they sent over the last
24 hours.
Matrix
The Matrix group shows the amount of traffic and number of errors
between pairs of devices on a LAN segment. For each pair, the Matrix
group maintains counters of the number of packets, number of
octets, and error packets between the nodes.
The conversation matrix helps you to examine network statistics in
more detail to discover who is talking to whom or if a particular PC is
producing more errors when communicating with its file server, for
example. Combined with Hosts Top N, this allows you to view the
busiest hosts and their primary conversation partners.
Filter
The Filter group provides a mechanism to instruct the RMON probe
to capture packets that match a specific criterion or condition.
Capture
The Capture group allows you to create capture buffers on the probe
that can be requested and uploaded to the management station for
decoding and presentation.
Events
The Events group provides you with the ability to create entries in an
event log and/or send SNMP traps to the management workstation.
Events can originate from a crossed threshold on any RMON variable.
In addition to the standard five traps required by SNMP (link up, link
down, warm start, cold start, and authentication failure), RMON adds
two more: rising threshold and falling threshold.
Effective use of the Events group saves you time; rather than having
to watch real-time graphs for important occurrences, you can
depend on the Event group for notification. Through the SNMP
traps, events can trigger other actions providing a mechanism for an
automated response to certain occurrences.