Recommended method for APs to obtain the AC IP address

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The DHCP Option 43 method is recommended. This method is not restricted by Layer 2 networking. It is easy to implement and requires no modification or deployment of a DNS server.

Other related questions:
How do APs obtain the AC IP address? What is the recommended method
APs obtain the AC IP address from Layer 2 CAPWAP broadcast packets, Option 43 in Layer 3 packets, or DNS server. The AC IP address can also be configured on APs. The Option 43 mode is recommended. This is because it is not restricted by Layer 2 networks and no DNS server is required.

How do APs obtain the AC IP address
You can manually configure the AC IP address for APs. APs can also obtain the AC IP address from Layer 2 CAPWAP broadcast packets, Option 43 in Layer 3 packets, or DNS server.

An AP fails to obtain an IP address
If the management address pool for APs is created on an AC, run the display ip pool name ip-pool-name used command on the AC. If the command output displays an AP's MAC address and a corresponding IP address, the AP has obtained an IP address. You can also run the following command to check whether an AP has obtained an IP address: - For V200R005 or earlier version: display ap-run-info id ap-id - For V200R006 or a later version: display ap all

An AC does not to respond to the Discovery packet sent by an AP after the AP obtains an IP address
Perform the following steps to locate the fault: 1. Check the AP authentication mode, blacklist, and whitelist. - If the AP fails the authentication, modify the configuration so that the AP can pass the authentication. - If the AP passes the authentication, go to the next step. 2. View packet statistics on the AC to check whether the AC has received the Discovery packet (assuming that only one AP is connected to the AC). - If the AC has received the Discovery packet, check whether the CAPWAP module processes the Discovery packet correctly. - If the AC has not received any Discovery packet, check whether the AC's source interface or source IP address has been configured.

What measures should be taken when an AP fails to obtain an IP address using DHCP
Perform the following steps to locate the fault: 1. Check whether the AP is configured to obtain an IP address using DHCP. 2. Check whether the Layer 2 link between the AP and DHCP server is working properly. 3. Run the display ip pool name ip-pool-name used command on the DHCP server to check whether the AP has obtained an IP address.

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