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10.4.1.4 Host Group
The Host group creates and maintains a host table for the segment monitored.
The Host MIB is very useful as it contains information and cumulative statistics
for every discovered host such as:
•
Host MAC address
•
Good packets/octets received/transmitted
•
Error packets transmitted
•
Broadcast packets transmitted
•
Multicast packets transmitted
The information provided by the Host MIB is stored for each MAC host. If the
error count or broadcast count rises sharply, it is relatively easy to isolate the
culprit by host address.
Note: As this process consumes a lot of storage, the monitoring device may
delete entries as needed based on the least recently used (LRU) entries first.
10.4.1.5 Host Top N Group
The Host Top N group provides a list of a given number of hosts that are
top-performers based on selected statistics. The user can select statistics from
the base Statistics MIB, taken over an interval period specified by the
management station. The number of such hosts to be selected is also specified
by the management station.
For instance, you can specify viewing the top 5 senders, top 10 broadcast hosts,
top 3 multicast hosts, etc. The Host Top N group can be particularly useful in
isolating hosts that are a source of problems in the network.
10.4.1.6 Matrix Group
The Matrix group consists of tables that store statistics for a particular
conversation between two addresses. New entries are appended as the
monitoring device detects new conversations.
Three tables are maintained within the Matrix group:
•
Control table
•
Source-Destination table
•
Destination-Source table
The Control table specifies the maximum number of entries to be captured and
placed into the Source-Destination table and Destination-Source table. As more
and more conversations are appended, resources will be recovered by deleting
the least recently used entries.
The Source-Destination table captures statistical information about a
conversation between two hosts and indexes that information from a
transmitter-oriented perspective.
The following information is stored in this table:
•
Source MAC address
•
Destination MAC address
•
Number of packets transmitted (including error packets)
•
Number of octets transmitted
•
Number of errors transmitted
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