3Com CoreBuilder 3500, Руководство по внедрению

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552 C
HAPTER
18: D
EVICE
M
ONITORING
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.
RMON-2 Groups The system software supports seven RMON-2 groups defined by the IETF
in RFC 2021 and one object from the probe configuration group.
Table 67 briefly describes these groups.
Table 67
RMON-2 Groups Supported in the System
RMON-2 Group
Group
Number
Purpose
protocolDir 11 Provides a list of all protocols that the probe
can interpret (protocols for which the probe
can decode and count packets). The
protocols can be different network-,
transport-, and higher-layer protocols. This
group allows the addition, deletion, and
configuration of entries in the list.
protocolDist 12 Maintains a table of aggregate statistics on
the amount of traffic generated by each
protocol, per LAN segment (not for each
host or application running on each host).
AddressMap 13 Maintains a table that maps each network
address to a specific MAC address and port
on an attached device and the physical
address on the subnetwork
nlHost 14 Provides network-layer host statistics on the
amount of traffic going in and out of hosts
based on network-layer address