Basic services of Dynamic Route for CDN (DCDN) support the pay-by-data-transfer and pay-by-peak-bandwidth billing methods. You can select a billing method to meet your business requirements.

Purchase guide

Beginning January 8, 2021, DCDN uses the pay-by-data-transfer billing method by default. After DCDN is activated, you cannot change the billing method in the DCDN console. How to purchase: If you want to use the pay-by-peak-bandwidth billing method and the peak bandwidth value within the last 30 days is greater 5 Gbit/s, you can submit a ticket or contact your sales manager. For more information, see DCDN pricing.

Data transfer plans

DCDN supports data transfer plans. For more information, see DCDN data transfer plans.
Note
  • Regions outside mainland China are classified into the following billable regions based on the locations where DCDN nodes are deployed: North America, Europe, Asia Pacific 1, Asia Pacific 2, Asia Pacific 3, Middle East, Africa, and South America. The billing rules vary based on the billable region.
  • If your workloads are deployed in different regions, you must purchase data transfer plans that can be used in these regions.

Pay-by-data-transfer

Description: You are billed for the daily outbound data transfer of DCDN nodes based on tiered pricing.

Applicable scenario: The network traffic fluctuates and the bandwidth usage spikes. The daily bandwidth usage is lower than 30%.

How to purchase: Log on to the DCDN console and make a purchase.

Pay-by-peak-bandwidth

Description: You are billed based on daily peak bandwidth values. A bandwidth value is collected every 5 minutes. A total of 288 values are collected every day. The highest bandwidth value is considered the daily peak bandwidth value.

Applicable scenario: The network traffic is relatively flat and the daily bandwidth usage exceeds 30%.

How to purchase: If you want to use the pay-by-peak-bandwidth billing method and the peak bandwidth value within the last 30 days is greater than 5 Gbit/s, you can submit a ticket or contact your sales manager. Alibaba Cloud determines whether to approve your application based on factors such as service security and resource quotas. After your application is approved, you can make a purchase in the DCDN console.

Examples

Example 1: Pay-by-data-transfer based on tiered pricing

The following figure shows the price tiers of DCDN.
Note The prices provided in this topic are for reference only. The actual prices on the pricing page shall prevail.

Data transfer in mainland China: The amount of data transfer from 00:00:00 (UTC+8) on March 1, 2021 to 23:59:59 (UTC+8) on March 9, 2021 is 10,200 GB. The amount of data transfer from 00:00:00 (UTC+8) on March 10, 2021 to 01:00:00 (UTC+8) on March 10, 2021 is 90 GB. The total amount of data transfer from March 1, 2021 to March 10, 2021 is 10,290 GB. On March 10, 2021, 40 GB of data transfer falls within the 0 GB to 10 TB price tier and the unit price is CNY 0.24 per GB. 50 GB of data transfer falls within the 10 TB to 50 TB price tier and the unit price is CNY 0.23 per GB.

Examples

40 × 0.24 + 50 × 0.23 = 21.1. Therefore, the data transfer fee from 00:00:00 (UTC+8) to 01:00:00 (UTC+8) on March 10, 2021 is CNY 21.1.

(10,200 + 40) × 0.24 + 50 × 0.23 = 2,469.1. Therefore, the data transfer fee from 00:00:00 (UTC+8) on March 1, 2021 to 01:00:00 (UTC+8) on March 10, 2021 is CNY 2,469.1.

Example 2: Pay-by-peak-bandwidth based on tiered pricing

The following figure shows the price tiers of DCDN.
Note The prices provided in this topic are for reference only. The actual prices on the pricing page shall prevail.
Bandwidth resources consumed in mainland China:
  • The peak bandwidth value on March 9, 2021 is 400 Mbit/s. It falls within the 0 Mbit/s to 500 Mbit/s price tier, and the unit price is CNY 0.6 per Mbit/s per day. Therefore, the bandwidth fee on March 9, 2021 is CNY 240 (400 × 0.6).
  • The peak bandwidth value on March 10, 2021 is 1 Gbit/s. It falls within the 500 Mbit/s to 5 Gbit/s price tier, and the unit price is CNY 0.58 per Mbit/s per day. Therefore, the bandwidth fee on March 10, 2021 is CNY 580 (1,000 × 0.58).
Examples

Considerations

The amount of data transfer that is recorded in the DCDN log equals the amount of data transfer that is captured at the application layer. However, the amount of data transfer that is actually consumed is 7% to 15% higher than the amount of data transfer that is captured at the application layer. The additional data transfer is generated due to the following reasons:
  • Insertion of TCP and IP packet headers

    HTTP requests are based on the TCP/IP Internet protocol suite. Each packet can contain at most 1,500 bytes, which include 40 bytes of the header section inserted by the TCP/IP Internet protocol suite. Headers also generate data transfer. However, headers are inserted into requests by the system kernel. Data transfer generated by headers cannot be captured at the application layer. In this case, the amount of data transfer generated by the header section is not recorded in the DCDN log. As a result, the actual amount of data transfer is about 3% higher than the amount of data transfer captured at the application layer. In this example, the additional data transfer is calculated based on the following formula: 2.74% × (40/1460).

  • Retransmission of TCP packets

    Based on the physical network conditions of the Internet, about 3% to 10% of packets may be dropped during transmission. Discarded packets are retransmitted by the system kernel based on the TCP/IP Internet protocol suite. Similarly, the data transfer for packet retransmission is not captured at the application layer. The proportion of the data transfer for retransmission to the data transfer recorded in the DCDN log varies based on the network conditions. For example, the proportion during off-peak hours in the morning is lower than that during peak hours in the evening. In most cases, the proportion ranges from 3% to 7%.

Therefore, as an industry standard practice, an additional 7% to 15% of data transfer is added to the total amount of billable data transfer. An average of 10% is used by DCDN.