Viewing bandwidth utilization
To view real-time bandwidth utilization as seen by a probe instance, choose Utilization > Bandwidth Utilization. This reveals the Bandwidth Utilization tool, which calculates utilization by how many bytes are seen over a one-second interval. If you are monitoring multiple ports (which the tool displays if true), the results are averaged.
The Bandwidth Utilization tool automatically activates. Click the View button to choose a different layout, or click Settings to further customize said layouts.
Note: The Bandwidth Utilization tool is only accurate when the network adapter speed is set correctly in Observer. To do this, choose Options > Selected Probe or SNMP Device Properties, and click the Adapter Speed tab.
Adapter speed is automatically determined by Observer. If necessary, you can manually set the network adapter speed—choose Options > Selected Probe or SNMP Device Properties, and click the Adapter Speed tab.
Changing the network adapter speed only affects Observer’s understanding of the adapter on that probe instance; no actual changes are made to the speed of your network adapter.
Bandwidth utilization is calculated by recording the number of bytes seen by the Observer (or probe) station. By running the mode at different times under typical network load, you can get an idea of what “normal” utilization is for your network. Knowing what is normal for your network is key to understanding any analyzer statistical modes and putting them in context. After you understand and recognize what is normal for your network, you can easily spot the anomalies if and when they occur.