Cisco Systems AIRAP1041NAK9 11

11 Configuring DHCP Option 43 and DHCP Option 60

This section contains 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.

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

separate DHCP pool for each access point type.

The 1040 series 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 60). The VCI string for the 1040 series access point is:

Cisco AP c1040

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

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:

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 AP1040

<IP Network> is the network IP address where the controller resides, such as

10.0.15.1

<Netmask> is the subnet mask, such as 255.255.255.0

<Default router> is the IP address of the default router, such as 10.0.0.1

<DNS Server> is the IP address of the DNS server, such as 10.0.10.2

Step 3 Add the option 60 line using the following syntax:

option 60 ascii “VCI string”

For the VCI string, “Cisco AP c1040”. The quotation marks must be included.