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) and Anti-DDoS Advanced 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 22.214.171.124 and 126.96.36.199, China Telecom protective IP 188.8.131.52, and China Unicom protective IP 184.108.40.206, of which the priority of 220.127.116.11 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 18.104.22.168, that from China Telecom to 22.214.171.124, and that from other ISPs to 126.96.36.199. If 188.8.131.52 is blocked, access traffic under this IP will be automatically scheduled to 184.108.40.206. If both 220.127.116.11 and 18.104.22.168 are blocked, traffic supposed to be scheduled to them will be distributed to 22.214.171.124, and if 126.96.36.199 is blocked too, traffic will be scheduled to 188.8.131.52.
Before enabling intelligent scheduling, please connect your business to be protected to your Anti-DDoS instance.
Before modifying DNS information, you need to purchase a domain name resolution product.
Please follow the steps below to set priorities for your protective lines based on your scheduling scheme.
Before using a CNAME record for intelligent scheduling, you are recommended to change the CNAME record of your business domain name DNS to the CNAME record automatically generated by the intelligent scheduling system of Tencent Cloud Anti-DDoS, to which all access traffic will be directed.