Usage

How does WAF calculate bandwidth?

FortiAppSec Cloud measures each account using a burstable model for overall account bandwidth calculation. The model is based on calculating the 95th percentile of bandwidth usage of clean traffic and is also common with other CDNs and Cloud solutions.

The 95th percentile bandwidth is calculated in the following way:

• Traffic for the entire month is measured in 5 minute buckets.
• At the end of the month, the 5% of buckets with the most Mbps are dropped, and the highest Mbps rate of the remaining buckets represents the 95th percentile value for the account.

At the beginning of every month, the 95th percentile bandwidth shown in FortiAppSec Cloud might be very low, or even shown as 0. This is because there aren't enough 5-minute buckets collected to calculate a valid value. At the end of the month with more buckets generated, the value becomes more accurate.