This topic describes how to reduce the costs of data transfer over the Internet by using data transfer plans and elastic IP address (EIP) bandwidth plans.

Data transfer plans

You can use data transfer plans to deduct the costs of data transfer over the Internet. Data transfer plans are billed on a subscription basis, which is more cost-effective than pay-as-you-go. In addition, you can use off-peak data transfer plans to reduce expenses on data transfer over the Internet. Data transfer plans are automatically applied to Elastic Cloud Service (ECS) instances, EIPs, and Server Load Balancer (SLB) instances that are billed by data transfer.

Data transfer plans are easy to use. After you purchase a data transfer plan, it is automatically applied. You can view the usage of data transfer plan on the Billing Management page.

The following section describes the benefits of data transfer plans:

  • Reduce the costs of data transfer

    Off-peak data transfer plans are offered at a lower price. In the following table, the China (Hong Kong) region is used as an example to compare the costs of data transfer when the pay-as-you-go billing method, a full-time data transfer plan, and an off-peak data transfer plan are used.

    Assume that your cloud resources consume a total of 5 TB data in the China (Hong Kong) region. The statistics in the following table show that using data transfer plans can greatly reduce the costs of data transfer.

    Billing of 5 TB of data transferred in the China (Hong Kong) region Unit price (CNY/GB) Total amount (CNY) Saves (CNY) Saves (%)
    Pay-as-you-go 1 5120 0 0
    Full-time data transfer plan 0.75 3727 1393 27.2%
    Off-peak data transfer plan 0.51 2609 2511 49%
  • Supports multiple scenarios

    All ECS instances, EIPs, and SLB instances that are paid by data transfer support data transfer plans. Data transfer plans allow you to minimize the costs when a large amount of data is transferred.

  • Easy to use

    • Each data transfer plan has a validity period. After a data transfer plan expires, the remaining quota of the plan becomes invalid. We recommend that you purchase a proper number of data transfer plans based on the historical data usage of your workloads. You can first purchase data transfer plans to meet the lowest data transfer requirement. Then, purchase more data transfer plans in the future when the need in data transfer grows.
    • When your data transfer plans are exhausted, the system automatically switches to the pay-as-you-go billing method. This ensures business continuity.
    • If you have purchased multiple data transfer plans, the system preferably applies the data transfer plan whichever will expire first.

EIP bandwidth plans

EIP bandwidth plans are offered as an independent bandwidth service. EIP bandwidth plans provide high-quality multi-line Border Gateway Protocol (BGP) bandwidth and support multiple billing methods. You can add EIPs to an EIP bandwidth plan. This allows the EIPs to share the bandwidth that is supported by the EIP bandwidth plan. You can associate the EIPs with ECS instances, NAT gateways, or SLB instances in a virtual private cloud (VPC). This way, these services can share the bandwidth of your EIP bandwidth plan.

EIP bandwidth plans support multiple billing methods, includingpay-by-bandwidth. You can purchase EIP bandwidth plans and choose different billing methods to reduce your expenses on bandwidth resources. In addition, this improves the elasticity of your services.

Note EIP bandwidth plans are provided as an independent bandwidth service. EIP bandwidth plans are not bundled with public IP addresses. You must manually add EIPs to EIP bandwidth plans.

You can use an EIP bandwidth plan to share the bandwidth that is included in the plan. This allows you to minimize the bandwidth costs. This is suitable for scenarios in which network traffic severely fluctuates. For example, you have deployed 10 ECS instances in the China (Hong Kong) region. EIPs are associated with these ECS instances. The EIPs are paid by bandwidth and the maximum bandwidth of each EIP is 100 Mbit/s. You must pay for the 10 EIPs with the maximum bandwidth of 100 Mbit/s. Therefore, you are charged CNY 3,253 per day.

However, the analytic results of network traffic on the 10 EIPs indicate that user traffic destined for different ECS instances fluctuate at different points in time. The peak outbound bandwidth of the 10 ECS instances is about 500 Mbit/s, as shown in the following figure.

In this case, you can use EIP bandwidth plans. You can purchase an EIP bandwidth plan of 500 Mbit/s in size for the 10 ECS instances. Each ECS instance can use a peak bandwidth five times that of the EIP, and you are charged only CNY 1,680 per day for the 500 Mbit/s EIP bandwidth plan. The daily bandwidth cost is reduced to CNY 1,573, which is 50% off.

Therefore, if you have purchased multiple EIPs and you experience severe workload fluctuations, you can purchase EIP bandwidth plans to reduce costs.

Note We recommend that you analyze the data transfer model of your system and select an appropriate billing method:

If the data transfer is stable, you can choose the subscription billing method. This saves 20% to 30% of the costs compared with the pay-as-you-go billing method.