Interface counter charts show how the overall network traffic load on an interface varies over time. These charts are generated from the interface counter data exported by sFlow. Interface counters charts are represented as stacked area charts.
This tab includes a control bar that allows you to select the switch (Section 4.5, “Selecting a switch”) and interface (Section 4.6, “Selecting an interface”) for which you would like to view trends in counter values, the counters charts to display and the specific time interval (see Chapter 10, Selecting a time period ).
When you have made changes to the selections for the chart, you can save these selections in a bookmark (see Section 1.4, “Navigating around sFlowTrend-Pro using the history navigator”) so that you can easily return to the same chart at a later date.
With sFlowTrend, or with sFlowTrend-Pro when the Time setting is relative to now (for example Last hour see Chapter 10, Selecting a time period ), these charts are automatically updated when the next data point is available. The Progress indicator shows how long it will be before the chart is next updated.
The following charts are available:
The WAP counters charts will only display data if sFlowTrend-Pro is receiving sFlow from wireless devices that support the sFlow 802.11 Structures
When the Utilization chart is chosen, the Units selector automatically changes to Bits/s, and cannot be altered. The chart left y-axis indicates bits/s while the right y-axis indicates % utilization of the link bandwidth.
When the Counters chart or one of the 802.11 wireless counters charts is chosen, the Units selector automatically changes to Frames/s and cannot be altered.
Sometimes the valuse for one interface counter can be much smaller than the values for other counters, making it hard to see the trend for the smaller counter. In this case, you can view the trend for only one interface counter, by clicking on the legend item corresponding to the counter of interest. For example, when viewing the Counters chart, clicking with the mouse button on Errors will change the chart so that it displays only the trend for errors; an additional trend line for discards can be added to the chart using Shift+ mouse button on Discards; or clicking with the mouse button on Errors or the background of the legend area will cause all trend lines to be displayed again.