Cisco Aironet 1815w Getting Started Manual page 39

Configuring DHCP Option 43

You can use DHCP Option 43 to provide a list of controller IP addresses to the access points, enabling

them to find and join a controller.

The following is a DHCP Option 43 configuration example on a Windows 2003 Enterprise DHCP

server for use with Cisco Aironet lightweight access points. For other DHCP server implementations,

consult product documentation for configuring DHCP Option 43. In Option 43, you should use the

IP address of the controller management interface.

DHCP Option 43 is limited to one access point type per DHCP pool. You must configure a

Note

separate DHCP pool for each access point type.

The Cisco Aironet 1815w access point uses the type-length-value (TLV) format for DHCP Option 43.

DHCP servers must be programmed to return the option based on the access point's DHCP Vendor

Class Identifier (VCI) string (DHCP Option 43). The VCI string for the Cisco Aironet 1815w access

point is:

Cisco AP c1810

The format of the TLV block is listed below:

• Type: 0xf1 (decimal 241)

• Length: Number of controller IP addresses * 4

• Value: List of WLC management interfaces

To configure DHCP Option 43 in the embedded Cisco DHCP server, follow these steps:

Enter configuration mode at the CLI.

Step 1

Create the DHCP pool, including the necessary parameters such as default router and name

Step 2

server. A DHCP scope example is as follows:

ip dhcp pool <pool name>

network <IP Network> <Netmask>

default-router <Default router>

dns-server <DNS Server>

Where:

<pool name> is the name of the DHCP pool, such as AP1815W

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