What can I do if the AP connected to an S series switches cannot obtain an IP address

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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.

Other related questions:
Can clients connected to S series switch obtain IP addresses through DHCP
DHCP-enabled terminals that are connected to S series switches except S1700 switches can obtain IP addresses from DHCP servers when either of the following conditions is met: - The DHCP server function has been enabled on the switches. (By default, the DHCP server function is disabled on a switch.) - A DHCP server is available on the network and reachable to the terminals.

Can terminals connected to S series switches obtain IP addresses through DHCP
For S series switches excluding the S1700, terminals connected to switches (enabled to obtain IP addresses through DHCP) can obtain IP addresses through DHCP when either of the following conditions is met: - The switch is configured with the DHCP server function. (By default, a switch is not configured with the DHCP server function.) - Another DHCP server is deployed on the network and there is a reachable route from the terminal to the DHCP 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

Actions taken if the start physical IP address cannot be connected
If a PC fails to connect to the start physical IP address of a file engine's management network port, perform the following procedure: 1. Ensure that management network cables are correctly connected. 2. Ensure that other IP addresses of the file engine are on the same network segment with its start physical IP address. For example, the configured start physical IP address of a file engine is 192.168.1.1/255.255.0.0. The file engine's access network ports must have an IP address from the 192.168.X.X network segment. 3. Run the ping command.

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