15-8 CHAPTER 15: REMOTE MONITORING (RMON) TECHNOLOGY
Host Group The host group detects hosts on the network by their physical MAC
addresses. The host group records the following statistics for each host:
■ Number of received packets
■ Number of transmitted packets
■ Number of received octets
■ Number of transmitted octets
■ Number of transmitted broadcast packets
■ Number of transmitted multicast packets
These statistics, indexed by the relative order in which the hosts are
discovered, appear in hostTimeTable.
HostTopN Group The HostTopN group prepares reports describing hosts that top a list that
is sorted in order of one of their statistics. Information from this group
includes these statistics:
■ Number of received packets
■ Number of transmitted packets
■ Number of received octets
■ Number of transmitted octets
■ Number of transmitted broadcast packets
■ Number of transmitted multicast packets
Matrix Group The matrix group records the following statistics about conversations
between sets of addresses:
■ Number of packets transmitted from the source address to the
destination address
■ Number of octets, excluding errors, transmitted from the source
address to the destination address
■ Number of bad packets transmitted from the source address to the
destination address
Event Group The event group logs alarms or traps network event descriptions.
Although alarm group thresholds trigger most events, other RMON
groups may define event conditions.
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