An AP fails to obtain an IP address

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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

Other related questions:
An AP fails to obtain an IP address through DHCP
Perform the following steps to locate the fault: 1. Check whether the AP is configured to obtain an IP address through 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.

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.

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.

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.

What can I do if the AP connected to an S series switches cannot obtain an IP address
For S series switches (except the S1700): For example, in a network composed of the AC, S5700, and AP, the AC assigns an IP address to the AP using DHCP. If the AP does not obtain any IP address, troubleshoot this fault on the switch as follows: - Run the display arp command to check whether the switch has learned the MAC addresses of the connected AC and AP. - Run the display dhcp snooping configuration command to check whether DHCP snooping is configured on the switch. If so, DHCP packets received on the interfaces between the switch and the AC or AP are filtered. If no error is found, check the configurations on the AC and AP.

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