How Is the Elastic Bandwidth Charged?

Billing Description

The elastic bandwidth of AAD instances is charged based on the peak traffic of DDoS attacks on the current day. The fees in different scenarios are described as follows:

Peak DDoS attack traffic on the current day ≤ Basic protection bandwidth: No elastic protection bandwidth fee is generated.
Basic protection bandwidth < Peak DDoS attack traffic on the current day < Elastic protection bandwidth: Elastic protection bandwidth fees will be generated.
If the peak DDoS attack traffic on the current day is greater than or equal to the configured elastic protection bandwidth, you will be charged for the elastic protection bandwidth.

Billing Examples

Basic protection bandwidth < Peak attack traffic < Elastic protection bandwidth: Elastic protection bandwidth usage (billed) = Peak attack traffic on the current day – Basic protection bandwidth
Peak attack traffic ≥ Elastic protection bandwidth: Elastic protection bandwidth usage (billed) = Elastic protection bandwidth – Basic protection bandwidth

For example, for three AAD instances, each has a basic protection bandwidth of 20 Gbit/s and an elastic protection bandwidth of 100 Gbit/s. If the three instances are under multiple DDoS attacks on the same day, the billing rules of the elastic protection bandwidth are as follows:

**Table 1** Billing rules
Instance	Peak Attack Traffic	Generate Fee	Description
Instance A	20Gbps	No	The peak attack traffic does not exceed the basic protection bandwidth, no fee is generated.
Instance B	80Gbps	Yes	Billed protection bandwidth: 80 Gbit/s - 20 Gbit/s = 60 Gbit/s.
Instance C	120Gbps	Yes	120 Gbit/s is greater than the elastic protection bandwidth 100 Gbit/s. Billable protection bandwidth: 100 Gbit/s - 20 Gbit/s = 80 Gbit/s.