History

The Ethernet History group records periodic statistical samples from a network. A sample is called a history and is gathered in time intervals referred to as "buckets." By enabling and creating histories, you establish a time-dependent method for gathering RMON statistics on a port. This information is displayed in the History tab.

The following are default values for history:

Buckets are gathered at 30-minute intervals.
Number of buckets gathered is 50.

Both the time interval and the number of buckets is configurable. However, when the last bucket is reached, bucket 1 is dumped and "recycled" to hold a new bucket of statistics. Then bucket 2 is dumped, and so forth.

To enable RMON history on a port basis:

In the device view, right-click the selected port.

The port shortcut menu opens.

Choose Enable Rmon History.

To enable RMON history on all ports:

From the Device Manager menu bar, choose Actions > Rmon History on All Ports.

Choose Enable.

To verify that RMON statistics are enabled:

From the Device Manager menu bar, choose Rmon > Control.

The Rmon Control dialog box opens with the History tab displayed. Note that the default owner in the screen is the host name on which Device Manager is running.