Understanding the network.pdf - Back to Home

management packets, MAC packets, soft ring errors, broadcasts, multicasts,
data packets, and packet size statistics.
• (Group 2) History group—Provides historical "snapshot" views of summary
data collected by statistics-group managed objects. Views and sampling
intervals are user-definable.
• (Group 3) Alarm group—Provides the ability to set operational thresholds
based on any collected data counter. Alarm thresholds can be set for a
functional range or absolute value. It is also possible to set different alarms
for the same value based on different thresholds. Alarm value
determinations are made based on the comparison statistical samples,
which are made at regular intervals.
• (Group 4) Host group—Collects traffic statistics on each host connected to
the segment. This includes packets sent, received, errors, broadcasts,
multicasts, runts, jabbers, collisions, and the order that each host was
discovered by the probe.
• (Group 5) HostTopN group—Provides the ability to create a specialized list of
hosts based on one or more statistics over a period of time. This provides the
ability to identify hosts that generate the highest traffic or most errors, and
so on.
• (Group 6) Matrix group—Provides the ability to monitor activity between
node pairs. Each pair is stored and all consequent conversations are logged.
This feature collects traffic and error statistics for each pair, which can then
be sorted by address. This provides the ability to see which node is accessing
the server the most, and so on.
• (Group 7) Filter group—Enables packet-filtering capabilities for the
packet-capture group. Filters can be defined based on packet type, network
event, and so on.
• (Group 8) Packet-capture group—Allows you to perform captures of all
packets on the segment. Multiple buffers can be used to store different
packet types using filtering capabilities defined by the filter group.
• (Group 9) Events group—Provides the ability to have local stations send
standard SNMP MIB-2 Trap information to the RMON probe, which can then
relay them to the management station. The events group also provides
notification processing of the probe's threshold alarms to the management
station and the packet-capture triggering based on traffic filter matches, and
so on.
• (Group 10) Token Ring extensions—Provides Token Ring specific monitoring.
The feature is essentially ring station monitoring, which includes data
collection on ring state, number of stations, Active Monitor, source routing
traffic, ring topology, fault domains, station order, claim tokens, and so on.
RMON II provides monitoring and collection capabilities similar to those provided in
RMON I. RMON II, however, provides these collection services to OSI Layer 3 and
above. This allows you to monitor network traffic by network protocol, transport