How Is Elastic Bandwidth Charged?
If the actual bandwidth used by a service exceeds the service bandwidth, rate limiting and packet loss may occur. Enabling elastic service bandwidth can effectively prevent rate limiting and packet loss.
Elastic service bandwidth is the maximum available bandwidth (postpaid) for service traffic.
Billing Rules
The elastic bandwidth of CNAD can be billed in two modes: daily 95th percentile billing and monthly 95th percentile billing. The elastic bandwidth can range from 20% to 500% of the service bandwidth you purchased.
If your actual bandwidth exceeds the maximum elastic bandwidth, rate limiting and packet loss may occur. Select a bandwidth based on your traffic volume.
The elastic bandwidth fees in different scenarios are described as follows.
| Service Bandwidth | Elastic Bandwidth | Actual Service Bandwidth | Elastic Bandwidth Fee | Description |
|---|---|---|---|---|
| 100 Mbit/s | Disabled | 120 Mbit/s | No elastic bandwidth fees will be generated. | If bandwidth exceeds your configured quota, traffic may be limited and packet loss may occur. |
| 100 Mbit/s | Enabled | 100 Mbit/s | No elastic bandwidth fees will be generated. | If the actual service bandwidth is less than or equal to the service bandwidth, no elastic service bandwidth fee is generated. |
| 100 Mbit/s | Enabled | 120 Mbit/s | Elastic bandwidth fees will be generated. | If the actual bandwidth is higher than the service bandwidth, elastic service bandwidth fees will be generated. |
Billing Principles
Elastic bandwidth can be billed in two modes: daily 95th percentile billing and monthly 95th percentile billing.
- Daily 95th percentile billing
Traffic is averaged over 5-minute intervals throughout each calendar day. These 5-minute averages are sorted in descending order, the top 5% are discarded, and the highest remaining value is taken as the billing bandwidth. Figure 1 describes how to calculate the daily 95th percentile billing bandwidth.
- Monthly 95th percentile billing
Traffic is averaged over 5-minute intervals throughout each calendar month. These 5-minute averages are sorted in descending order, the top 5% are discarded, and the highest remaining value is taken as the billing bandwidth. Figure 2 shows how to calculate the monthly 95th percentile bandwidth for 30 days.
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