Specifications

9031280 E4 Using RMON Views

5-7

Accessing Ethernet Views

Ethernet History

From the Icon Subviews menu, click on Ethernet History. The Ethernet

History Table presents the RMON History data in tabular form. The RMON

History group records data from the Statistics group over user-defined

intervals and stores it for later retrieval, allowing you to perform trend

analysis of a statistic over time or to isolate periods of time during which a

network event may have occurred.

Figure 5-2. Ethernet History Control Table View

The History Control Table (Figure 5-2) presents the configuration of each

History instance running on the network interface. By default, the RMON

standard specifies 2 instances, having intervals of 1800 seconds and 30

seconds. Each instance features the following fields:

• Data Source—Interface being monitored

• Interval—The sample collection interval

• SizeReq—Maximum number of recorded intervals (buckets) requested

for the sample

• Size—The number of buckets currently recorded in the sample

• Owner—The person who configured the entry

• Status—The status of the control table entry

Note that when the values for SizeReq and Size are identical, the oldest

entries in the History Control Table for that instance will be replaced by the

newest entries.

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