The AP is required to register at Layer 3, but the DHCP server does not support issuing Option 43. How to make the AP automatically obtain the IP address of the AC.
If there is an intranet DNS server, you can configure the domain name address of the AC on the DNS server and resolve it to the IP address of the AC. The AP initiates a registration request to the domain name h3c.h3c.com by default.