By default, the high-security IP Service provides CNAME automatic scheduling without additional opening.
CNAME Auto Switch provides the failover capability that when an ISP line of an Anti-DDoS Pro instance encounters a problem, the service can be automatically switched to a healthy line, ensuring the service continuity and availability. For example, you enable CNAME Auto Switch for a domain protected by an Anti-DDoS Pro instance that has China Telecom and China Unicom two lines.
- When the IP address of the China Telecom line fails, the Anti-DDoS Pro service can automatically switch to the IP address of the China Unicom line that works normally.
- When both IP addresses of the China Telecom line and the China Unicom line fail, CNAME Auto Switch cannot work.