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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 3500 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 3500 series access point is:

Cisco AP c3500

If your access point was ordered with the Service Provider Option (AIR-OPT60-DHCP)

Note

selected in the ordering tool, the VCI string for the access point contains ServiceProvider. For

example, an AP3500 with this option will return this VCI string:

Cisco AP c3500-ServiceProvider

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 IOS DHCP server, follow these steps:

Enter configuration mode at the Cisco IOS CLI.

Step 1

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 AP3500

<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

Add the option 60 line using the following syntax:

Step 3

option 60 ascii "VCI string"

For the VCI string, "Cisco AP c3500". The quotation marks must be included.