Dell PowerConnect 8024 User Configuration Manual page 366

Figure 16-15. Add History Entry
3 Select the port or LAG on which you want to maintain a history of
statistics.
4 Specify an owner, the number of historical buckets to keep, and the
sampling interval.
5 Click Apply to add the entry to the RMON History Control Table.
To view configured history entries, click the Show All tab. The RMON
History Control Table displays. From this page, you can remove configured
history entries.
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Monitoring Switch Traffic