Installation Guide

• The AP is still connected to the same controller, and a specific syslog server's IP address has been
configured for the AP on the controller using the config ap syslog host specific Cisco_AP
syslog_server_IP_address command. In this case, the controller sends the new specific syslog server's
IP address to the AP.
• The AP is disconnected from the controller and joins another controller. In this case, the new controller
sends its global syslog server's IP address to the AP.
• Whenever a new syslog server's IP address overrides the existing syslog server's IP address, the old
address is erased from persistent storage, and the new address is stored in its place. The AP also starts
sending all syslog messages to the new IP address, provided the AP can reach the syslog server's IP
address.
You can configure the syslog server for APs and view the AP join information only from the controller CLI.
Important Information for Controller-based Deployments
Keep these guidelines in mind when you use the AP:
• The AP can only communicate with Cisco controllers.
• The AP does not support Wireless Domain Services (WDS) and cannot communicate with WDS devices.
However, the controller provides functionality equivalent to WDS when the AP joins it.
• CAPWAP does not support Layer 2. The AP must get an IP address and discover the controller using
Layer 3, DHCP, DNS, or IP subnet broadcast.
• The AP console port is enabled for monitoring and debugging purposes. All configuration commands
are disabled when the AP is connected to a controller.
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.
DHCP Option 43 is limited to one AP type per DHCP pool. You must configure a separate DHCP pool for
each AP type.
Note
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:
Cisco Catalyst 9124AX Series Outdoor Access Point Hardware Installation Guide
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Troubleshooting
Important Information for Controller-based Deployments