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Adding or Editing an Entry in the Control Table
Click on the Add (Edit) button in the History Control Table to add (edit) an index entry as shown on the preceding
page. Each interface equates to a physical media on the device being monitored. This information can be found
under MIB2 (see 6-5). The number of buckets indicates the number of samples to record. You should always be
able to record the default of 50 buckets without overflowing the agent’s memory. However, if more than 50
buckets are requested, the number actually granted will depend on the amount of memory currently available.
Once all the buckets are filled, older data will be discarded. You also need to specify the interval at which to take
samples. For example, using a 30 second interval with 120 buckets will provide one hour of historical samples.
Viewing History
The RMON Manager collects historical information on bandwidth utilization, packet types, errors and collisions,
as well as the distribution of packet sizes for each entry you define. Each sample shows the interval’s start time.
The information collected during the interval is displayed in both numeric and graphical format for easy
interpretation.
To display the history for a specific entry, highlight that entry in the Control Table and click on the View button.
The various history screens are shown below. The scale for the graphic displays are automatically adjusted to
present the best view possible. If necessary, you can reduce the polling interval to focus in a specific problem, or
increase it to reduce overall management traffic running on the network.