When you purchase a savings plan, you can calculate the spending commitment based on the amount of data transfer forwarded by your Enterprise Edition transit routers. This topic describes how to calculate the spending commitment, purchase a savings plan, and view the fees offset by a savings plan.
Calculate the spending commitment
Transit router savings plans are ideal for scenarios with flat traffic, flat peak traffic, and long-term subscriptions. We recommend that you observe the traffic fluctuations of your Enterprise Edition transit routers, determine a proper traffic tier, and then calculate the spending commitment.
The unit prices and discounts in the following examples are for reference only. The pricing and discount information on the buy page shall prevail.
For easier calculation, numbers are rounded up or down to two decimal places. The results on the buy page shall prevail.
For example, a company deployed an Enterprise Edition transit router in each of the China (Hangzhou), China (Shenzhen), and China (Zhangjiakou) regions. All the transit routers are forwarding network traffic. The following figure shows the traffic fluctuation status of the transit routers within 7 days. Assume that the commitment term is 1 hour. The following figure shows the total amount of data transfer of all the transit routers within a commitment term. 
The traffic fluctuation status shows that the transit routers must forward at least 250 GB of data during each commitment term. The company can use a savings plan to offset the fee of at least 250 GB of data transfer during each commitment term. Assume that the company chooses 100% upfront payment when it purchases a savings plan.
Spending commitment within each commitment term = 250 GB × USD 0.02 per GB × 0.612 = USD 3.06. USD 3.06 is rounded down to USD 3 because the spending commitment must be an integer.
USD 3/0.612/USD 0.02 per GB = 245.10 GB. The saving plan can offset the fee of 245.10 GB of data transfer during each commitment term.
NoteIf the calculation result is not an integer, round it up or down to the nearest integer.
In this example, if the spending commitment is rounded up to USD 4, then: USD 4/0.612/USD 0.02 per GB = 326.80 GB. The savings plan can offset the fee of 326.80 GB of data transfer during each commitment term. The preceding figure shows that the amount of data transfer during each commitment term is less than 270 GB. The fee of 270 GB of data transfer is closer to USD 3 than USD 4. Fewer resources are wasted if USD 3.06 is rounded down to USD 3.
245.10 GB × USD 0.02 per GB - USD 3 = USD 1.90. The bill of each commitment term is reduced by USD 1.90.
Assume that a total of 44,239 GB of data is forwarded within 7 days. The amount of data transfer is used to predict the amount of data transfer within 365 days. Then, the total amount of data transfer fee within 365 days can be reduced by 36.07%.
USD 1.90 × 24 hours per day × 365 days = USD 16,644. The data transfer fee within 365 days is reduced by USD 16,644.
If no savings plans are applied, the total data transfer fee within 365 days is: 44,239 GB × USD 0.02 per GB × (365 days/7 days) = USD 46,134.96.
USD 16,644/USD 46,134.96 = 36.07%. The data transfer fee is reduced by 36.07% after the savings plan is applied.
Purchase a savings plan
Log on to the CEN console.
In the left-side navigation pane, click Savings Plans.
On the Savings Plans page, click Buy Now.
On the Savings Plan for Transit Router page, set the following parameters, click Buy Now, and then complete the payment.
Parameter
Description
Savings Plan Type
Default value: General-purpose.
Committed Consumption Amount
Enter a spending commitment.
Minimum value: USD 1. The value must be a positive integer.
Installment Payment
Select a type of upfront payment. Valid values:
0% Upfront: You do not need to pay for the savings plan. Bills are generated for each commitment term until the savings plan expires.
100% Upfront: You need to pay off the savings plan. A certain amount of data transfer fee is offset during each commitment term until the savings plan expires.
Duration
Default value: 1 Year.
Committed Consumption Cycle
Default value: By Hour.
Effective Time
Select the time when you want the savings plan to take effect.
Immediately Take Effect
The savings plan takes effect at the start of the next commitment term. For example, if you make the purchase at 13:45 on June 29, 2023 and select Immediately Take Effect, the savings plan takes effect at 14:00 on June 29, 2023.
Take Effect At a Specified Time (By Hour)
View the fees offset by a savings plan
You can view the fees offset by a savings plan on the Savings Plans page. You can view the amount of fees offset by the savings plan, the details about the use of the savings plan, the usage of the savings plan, and the offset rate of the savings plan.