This topic describes the billing methods for the burstable clean bandwidth of Anti-DDoS Pro and Anti-DDoS Premium instances.
Overview
After you add services to an Anti-DDoS Pro or Anti-DDoS Premium instance, random packet loss occurs if the peak service traffic exceeds the Clean Bandwidth limit. If the clean bandwidth is exceeded for a sustained period, rate limiting is triggered, which disrupts normal access to your services. To resolve issues caused by exceeding the clean bandwidth:
If the Clean Bandwidth of your instance is insufficient for your daily business requirements, you can upgrade the instance to increase the clean bandwidth. For more information, see Upgrade an instance.
If your Clean Bandwidth specification is sufficient for your daily business requirements but not for traffic fluctuations or sudden increases in normal access traffic, you can enable burstable clean bandwidth for your Anti-DDoS Pro or Anti-DDoS Premium instance.
Burstable clean bandwidth provides additional clean bandwidth for your instance on top of its base clean bandwidth. This helps prevent rate limiting caused by normal service traffic fluctuations that exceed the clean bandwidth specification during peak hours. After you enable burstable clean bandwidth, you are charged on a pay-as-you-go basis only for the extra bandwidth used when your peak traffic exceeds the clean bandwidth specification.
If you are a proof of concept (POC) user, do not enable burstable clean bandwidth to avoid incurring pay-as-you-go bills.
Scenarios
You can enable burstable clean bandwidth for your Anti-DDoS Pro or Anti-DDoS Premium instance if the protected services involve the following scenarios:
Large-scale sales promotions during holidays, such as Black Friday.
New service launches, such as opening a new game server or releasing a new product.
Sudden increases in website traffic during specific periods, such as for university course selection systems or government lottery systems.
Supported instance types
Anti-DDoS Proxy (Chinese Mainland): Profession, Advanced
Anti-DDoS Proxy (Outside Chinese Mainland): Insurance, Unlimited, Sec-CMA 2.0, Sec-CMA 2.0 (Insurance), Sec-CMA 2.0 (Unlimited), Chinese Mainland Acceleration, Sec-CMA 1.0
Burstable bandwidth and total clean bandwidth
Instance service bandwidth limit
Anti-DDoS Proxy (Chinese Mainland): Profession (20,000 Mbps), Advanced (20,000 Mbps)保险防护
Anti-DDoS Proxy (Outside Chinese Mainland): Insurance(5,000 Mbps), Unlimited(5,000 Mbps), Sec-CMA 2.0 (1,500 Mbps), Chinese Mainland Acceleration (1,000 Mbps), Sec-CMA 1.0 (500 Mbps)
Formulas for burstable bandwidth and total clean bandwidth
Formulas
Maximum burstable bandwidth increase = min(Base Clean Bandwidth × 9, Instance clean bandwidth limit - Base Clean Bandwidth).
Total clean bandwidth (maximum traffic the instance can handle) = Base Clean Bandwidth + Burstable bandwidth increase.
Key points
Burstable bandwidth is typically nine times the base clean bandwidth.
The total clean bandwidth cannot exceed the instance clean bandwidth limit.
The potential for a burstable bandwidth increase becomes more limited as the base Clean Bandwidth increases.
Example: For an Anti-DDoS Proxy (Chinese Mainland)-Profession instance, the instance clean bandwidth limit is 20,000 Mbps.
If the Clean Bandwidth is 100 Mbps
Maximum burstable bandwidth increase: 100 × 9 = 900 Mbps
Maximum traffic the instance can handle: 100 + 900 = 1,000 Mbps
If the Clean Bandwidth is 3,000 Mbps
Maximum burstable bandwidth increase: min(3,000 × 9, 20,000 - 3,000) = 17,000 Mbps
Maximum traffic the instance can handle: 20,000 Mbps
If the Clean Bandwidth is already greater than 20,000 Mbps
Maximum burstable bandwidth increase: min(20,000 × 9, 20,000 - 20,000) = 0 Mbps
Maximum traffic the instance can handle: 20,000 Mbps
Burstable clean bandwidth pricing
Instance type | Monthly 95th percentile unit price (USD/month/Mbps) | Daily 95th percentile unit price (USD/day/Mbps) |
Anti-DDoS Proxy (Chinese Mainland)-Profession, Advanced | 15 | 1 |
Anti-DDoS Proxy (Outside Chinese Mainland)-Insurance | 16 | 1.05 |
Anti-DDoS Proxy (Outside Chinese Mainland)-Unlimited | 21 | 1.4 |
Anti-DDoS Proxy (Outside Chinese Mainland)-Sec-CMA 2.0 | 155 | 10 |
Anti-DDoS Proxy (Outside Chinese Mainland)-Chinese Mainland Acceleration | 155 | 10 |
Anti-DDoS Proxy (Outside Chinese Mainland)-Sec-CMA1.0 | 155 | 10 |
Billing methods
Burstable clean bandwidth takes effect immediately after you enable it.
Burstable clean bandwidth is a pay-as-you-go feature. It supports two metering methods: daily 95th percentile and monthly 95th percentile.
You can switch between the metering methods. The new metering method takes effect at 00:00 on the first day of the next calendar month. You can change the metering method up to three times per calendar month. The last change made within a calendar month takes effect in the following month.
Item | Daily 95th percentile | Monthly 95th percentile |
Fee settlement | Fees are settled on a calendar day basis. Important If you enable burstable clean bandwidth for the first time on Day T of a calendar month and select the daily 95th percentile metering method, you are not charged on Day T. Fees are incurred starting from Day T+1, and the bill is generated on Day T+2. | Fees are settled on a calendar month basis. |
Billing conditions | Fees are incurred if the 95th percentile bandwidth of a calendar day exceeds the Clean Bandwidth specification. To calculate the 95th percentile bandwidth of a calendar day, the system collects a bandwidth value from your Anti-DDoS Pro or Anti-DDoS Premium instance every 5 minutes. This results in 288 values per day. The system removes values collected during DDoS attacks and then removes the top five of the remaining values. The highest remaining value is the 95th percentile bandwidth for that day. | Fees are incurred if the 95th percentile bandwidth of a calendar month exceeds the Clean Bandwidth specification. To calculate the 95th percentile bandwidth of a calendar month:
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Fee calculation formula | Burstable clean bandwidth fee = Billable burstable clean bandwidth (Mbps) × Daily unit price(USD/day/Mbps). | Burstable clean bandwidth fee = Billable burstable clean bandwidth (Mbps) × Effective factor × Monthly unit price(USD/month/Mbps). |
Conditions |
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How to enable burstable clean bandwidth
When you purchase an Anti-DDoS Pro or Anti-DDoS Premium instance, you can enable burstable clean bandwidth by setting the 95th Percentile Burstable Clean Bandwidth Mode parameter on the buy page. For more information, see Purchase an Anti-DDoS Pro or Anti-DDoS Premium instance.
If you do not enable the burstable clean bandwidth feature when you purchase an instance, you can enable it on the Anti-DDoS Pro console's Instances page. For more information, see Configure the burstable clean bandwidth feature.
Bill generation and settlement
The following table describes the billing and settlement times for burstable clean bandwidth.
You can query and confirm billing details for burstable clean bandwidth on the System Logs page. For more information, see System logs.
Metering method | Bill generation time | Settlement time |
Daily 95th percentile | The bill for the burstable clean bandwidth that is used in a calendar day is displayed on the System Logs page at 14:00 on the next day, and Alibaba Cloud sends notifications to the contacts of your Alibaba Cloud account by email. | At 17:00 on the next day the burstable clean bandwidth is used, Alibaba Cloud deducts the fee of the burstable clean bandwidth feature from your account balance. |
Monthly 95th percentile | The bill for the burstable clean bandwidth that is used in a calendar month is displayed on the System Logs page at 10:00 on the first day of the next month, and Alibaba Cloud sends notifications to the contacts of your Alibaba Cloud account by email. | At 10:00 on the third day of the next month, Alibaba Cloud deducts the fee of the burstable clean bandwidth feature from your account balance. |
Billing example
This section provides an example of how to calculate the fees for burstable clean bandwidth using the monthly 95th percentile metering method.
On January 1, 2023, you purchased an Anti-DDoS Pro and Anti-DDoS Premium (Chinese mainland) Professional Edition instance with a base clean bandwidth of 200 Mbps. You enabled burstable clean bandwidth, selected the monthly 95th percentile metering method, and set the burstable bandwidth increase to 300 Mbps. These configurations remained unchanged as of February 1.
From February 3, 2023 to February 6, 2023, you adjusted the base clean bandwidth specification and the burstable bandwidth increase.
On February 8, 2023, you disabled burstable clean bandwidth.
On February 27, 2023, you re-enabled burstable clean bandwidth and set the burstable bandwidth increase to 100 Mbps.
The following figure shows the daily base clean bandwidth, total clean bandwidth, and daily peak traffic. The graph shows data only for the periods during which burstable clean bandwidth was enabled.
Based on the formula: Burstable clean bandwidth fee = Billable burstable clean bandwidth (Mbps) × Effective factor × Monthly unit price for the instance(USD/month/Mbps), the fee is calculated as follows:
Calculate the billable burstable clean bandwidth
The billable burstable clean bandwidth is the smaller of the 95th percentile bandwidth of the calendar month and the total clean bandwidth, minus the base Clean Bandwidth specification on the last day that burstable clean bandwidth was enabled. The calculation is as follows:
95th percentile bandwidth of the calendar month: For this billing cycle, the average of the top five daily peak traffic values is (1,000 Mbps + 500 Mbps + 600 Mbps + 500 Mbps + 400 Mbps) ÷ 5 = 600 Mbps.
Total clean bandwidth: The maximum total clean bandwidth that corresponds to the top five daily peak bandwidth values is 500 Mbps.
Billable burstable clean bandwidth: 500 Mbps - 100 Mbps (base clean bandwidth specification on the last day that burstable clean bandwidth was enabled) = 400 Mbps.
Calculate the effective factor
The effective factor is 10 (number of days that burstable clean bandwidth was enabled) ÷ 28 (total number of days in the month) = 0.35714285.
Find the monthly unit price for the instance's burstable clean bandwidth
As specified in Burstable clean bandwidth pricing, the monthly unit price for an Anti-DDoS Pro and Anti-DDoS Premium (Chinese mainland) Professional Edition instance is 15 (USD/month/Mbps).
Based on these results, your burstable clean bandwidth fee is 400 Mbps × 0.35714285 × 15 (USD/month/Mbps) = 2,142.8571 USD.