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Configuring DHCP Option 43
• The AP does not support Wireless Domain Services (WDS) and cannot communicate with WDS devices.
• CAPWAP does not support Layer 2. The AP must get an IP address and discover the controller using
• The AP console port is enabled for monitoring and debugging purposes. All configuration commands
Configuring DHCP Option 43
You can use DHCP Option 43 to provide a list of controller IP addresses to the AP, enabling it to find and
join a controller.
The following is a DHCP Option 43 configuration example on a Microsoft Windows 2003 Enterprise DHCP
server for Cisco Catalyst lightweight APs. For other DHCP server implementations, consult the product
documentation to configure DHCP Option 43. In Option 43, use the IP address of the controller management
interface.
Note
DHCP Option 43 is limited to one AP type per DHCP pool. You must configure a separate DHCP pool for
each AP type.
The Cisco Catalyst 9124AX Series Outdoor AP uses the type-length-value (TLV) format for DHCP Option
43. DHCP servers must be programmed to return the option based on the AP DHCP Vendor Class Identifier
(VCI) string (DHCP Option 43). The VCI string for the AP:
Cisco AP C9124AX
The format of the TLV block is listed below:
• Type—0xf1 (decimal 241)
• Length—Number of controller IP addresses * 4
• Value—IP addresses of the controller management interfaces listed sequentially in hexadecimal format.
Procedure
Step 1
Enter configuration mode at the Cisco IOS CLI.
Step 2
Create the DHCP pool, including the necessary parameters such as default router and name server. A DHCP
scope example is as follows:
Example:
ip dhcp pool <pool name>
network <IP Network> <Netmask>
default-router <Default router>
dns-server <DNS Server>
Where:
Cisco Catalyst 9124AX Series Outdoor Access Point Hardware Installation Guide
86
However, the controller provides functionality equivalent to WDS when the AP joins it.
Layer 3, DHCP, DNS, or IP subnet broadcast.
are disabled when the AP is connected to a controller.
Troubleshooting
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