Each account can have multiple Anti-DDoS instances, and each instance has at least one protective line; therefore, there can be multiple protective lines under one account. Once your business is added to an Anti-DDoS instance, a protective line will be configured for it. If multiple protective lines have been configured, you need to choose the optimal business traffic scheduling method, i.e., how to schedule business traffic to the optimal line for protection while ensuring high business access speed and availability.
Anti-DDoS features priority-based CNAME intelligent scheduling, where you can select an Anti-DDoS instance and set the priority of its protective line as needed.
Anti-DDoS Pro (includes single-IP and multi-IP instances), Anti-DDoS Advanced and Anti-DDoS Ultimate instances support setting resolution.
This refers to using the protective line of the highest priority to respond to all DNS requests, i.e., all access traffic will be scheduled to the protective line of the currently highest priority. You can adjust the priority value of protective line, which is 100 by default. The smaller the value, the higher the priority. The specific scheduling rules are as follows:
If no protective lines of the second-highest priority are available, automatic scheduling cannot be completed, and business access will be interrupted.
Assume that you have the following Anti-DDoS instances: BGP protective IPs 18.104.22.168 and 22.214.171.124, China Telecom protective IP 126.96.36.199, and China Unicom protective IP 188.8.131.52, of which the priority of 184.108.40.206 is 2 and that of the rest is 1. Normally, all traffic will be scheduled to the protective lines with the current priority of 1. Specifically, traffic from China Unicom will be scheduled to 220.127.116.11, that from China Telecom to 18.104.22.168, and that from other ISPs to 22.214.171.124. If 126.96.36.199 is blocked, access traffic under this IP will be automatically scheduled to 188.8.131.52. If both 184.108.40.206 and 220.127.116.11 are blocked, traffic supposed to be scheduled to them will be distributed to 18.104.22.168, and if 22.214.171.124 is blocked too, traffic will be scheduled to 126.96.36.199.
Before enabling intelligent scheduling, please connect your business to be protected to your Anti-DDoS instance.
To modify the DNS resolution, you need to purchase the domain name resolution product.
Please follow the steps below to set priorities for your protective lines based on your scheduling scheme.
Assume that you want to implement the following scheme: The business traffic will be scheduled to a BGP protective line first; if it is blocked due to attacks, the traffic will be automatically scheduled to a China Telecom protective line; if it is blocked too, the traffic will be scheduled to a China Unicom protective line; and after the BGP protective line is unblocked, the traffic will be scheduled to it automatically.
To implement this scheduling scheme, set the priority of the BGP line in the protective instance to 1 and that of the China Telecom line to 2, and keep the priority of the China Unicom line unchanged.
If you do not want the China Unicom protective line to be in the traffic scheduling scheme, click to disable DNS for it, and you can enable DNS again and set its priority when necessary. If you want to delete it from the current scheduling scheme, you can locate the row of its corresponding instance and click Unbind.