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Capacity SLE

SUMMARY Use the Capacity SLE to track user experiences with RF channel capacity (bandwidth) on your wireless network.

Capacity is one of the wireless Service-Level Expectations (SLEs) that you can track on the Monitor page of the Juniper Mist™ portal. Understand what's measured by this SLE and what issues can contribute to a low SLE.

What Does the Capacity SLE Measure?

Juniper Mist monitors the percentage of the total RF channel capacity that is available to clients.

You can click the Settings button to set the success threshold for this SLE. For example, you might want 20 percent of the RF channel capacity (bandwidth) to be available to clients at any time.

Classifiers for Low Capacity

When the capacity threshold is not met, Juniper Mist classifies the issues as follows.

  • Wi-Fi interference—Low capacity is due to wireless interference.

  • Non-Wi-Fi interference—Low capacity is due to non-wireless interference.

  • Client Count—Low capacity is due to a high number of attached clients.

  • Client Usage—Low capacity is due to a high client load.

Example

Capacity SLE Example

  • Success Rate—On the left, you see that the threshold was met only 37 percent of the time.

  • Timeline—In the middle, you can drag your mouse to explore the success rate over time. In this example, there was a 7 percent success rate at the selected time. To adjust the scope of the timeline, use the timeline drop-down list at the top of the Monitor page. For example, set the timeline to Today, Yesterday, This Week, or a custom date range.

  • Classifiers—On the right, you see a high-level root cause analysis for the user minutes that did not meet the threshold. Almost all these issues (99 percent) were due to Wi-Fi interference. The remaining issues were due to other interference and client usage. No issues (0 percent) were attributed to Client Count.

Note:

You can click the Values button to show numbers instead of the success rate and classifier percentages. With the Capacity SLE, you see the average percentage of bandwidth that was available during the specified time period. The timeline shows the percentage of total bandwidth that was available at each point in time. The right side of the screen shows the number of user minutes that were impacted by each classifier.

Capacity SLE Example with Values