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WAN Gateway Bandwidth SLE

Use the WAN Gateway Bandwidth SLE to track if the gateway bandwidth met or failed to meet the threshold.

WAN Gateway Bandwidth is one of the Service-Level Expectations (SLEs) that you can track on the WAN SLEs dashboard in the Juniper Mist™ portal.

Get familiar with the Service Level Expectations (SLEs) and the SLE dashboard. See Service-Level Expectations (SLE).

To find the WAN SLEs dashboard, select Monitor > Service Levels from the left menu, and then click the WAN button.

Figure 1: Gateway Bandwidth SLE WAN Bandwidth Gateway SLE

The metric beside the Gateway Bandwidth indicates the percentage of the time the Gateway Bandwidth was healthy for a given time range. A 100% success rate indicates that there were no failures for that metric. When the success rate is less than 100%, it signifies that failures occurred on the Site/WAN Edge corresponding to that metric. In such cases, classifiers display the details of the failures.

Note:

The gateway bandwidth SLE is unique to the SRX Series Firewall and the WAN Gateway Bandwidth SLE evaluates the IPsec overlay that constitutes the SD-WAN.

What Does the WAN Gateway Bandwidth SLE Measure?

This SLE covers packet drops due to congestion (congestion classifier) and high bandwidth usage (headroom classifier). If the ratio of dropped packets to total queued packets is significant, the congestion classifier is displayed along with the queue experiencing the most drops. If there are no dropped packets but bandwidth usage exceeds a certain upper threshold, a headroom classifier is shown along with the most utilized queue. The headroom threshold is determined based on maximum usage statistics from the past two weeks.

Use this SLE to determine if you need more WAN bandwidth on your site.

Classifiers

When the WAN Bandwidth threshold is not met, Juniper Mist sorts the issues into classifiers. The classifiers appear on the right side of the SLE block.

  • Bandwidth Headroom—This classifier is activated when bandwidth usage surpasses the SLE threshold. It indicates the percentage of time the gateway bandwidth SLE was not met due to exceeding the headroom threshold. The headroom is an estimated baseline of available WAN bandwidth, based on the highest usage over the past 14 days. The classifier triggers when current usage exceeds this baseline.

  • Congestion Uplink—This classifier indicates the percentage of time the Gateway Bandwidth SLE was not met due to uplink congestion. This classifier measures the number of output drops. That is, the classifier uses the ratio of total transmitted bytes dropped to total packets transmitted (tx_drops/tx_packets) to determine if there are bad user minutes due to congestion.

For more details on SLE blocks, see Understanding the SLE Blocks.

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