What measures should be taken when an AP fails to obtain an IP address using DHCP

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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.

Other related questions:
What measures should be taken when an AC fails 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: - Check the AP authentication mode, blacklist, and whitelist. a) If the AP authentication fails, modify the configuration so that the AP can pass the authentication. b) If the AP authentication succeeds, go on with the following steps. - Check 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). a) If the AC has received the Discovery packet, check whether the CAPWAP module processes the Discovery packet incorrectly. b) If the AC has not received the Discovery packet, check whether a source interface or source address is configured for the AC.

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.

Why do IP address conflicts occur on an AC? What measures should be taken in this case
An IP address conflict occurs when two users in a LAN are allocated the same IP address. IP address conflicts are caused by errors in address allocation. For example, a client's IP address has been released using a Release packet or the reset ip pool command or because the lease has expired. However, the AC does not notify the user that the IP address has been released. The DHCP server then allocates this IP address to another client. This client pings the IP address and receives a reply, so it sends a Decline packet to the DHCP server. The server sets this IP address to conflicted state. When an IP address conflict occurs, run the reset ip pool { interface pool-name | name ip-pool-name } { start-ip-address [ end-ip-address ] | conflict } command on the DHCP server to release the conflicting IP address.

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

Actions taken if an IP address fails to be configured
If an IP address fails to be configured, perform the following procedure: 1. Modify the configurations based on the error message. 2. Ensure that the physical, virtual, and management IP addresses do not conflict with each other. This is because the physical and virtual IP addresses that you are supposed to enter are the start IP addresses �?ISM then automatically configures subsequent IP addresses based on the number of network ports.

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