Cisco Cisco Aironet 701e Access point 설치 가이드

The 700 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 700 series access point is:

If your access point was ordered with the Service Provider Option (AIR-OPT60-DHCP) selected in the ordering tool, 
the VCI string for the access point contains ServiceProvider. For example, a 700 with this option will return this VCI 
string: 
Cisco AP c700-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. 

Create the DHCP pool, including the necessary parameters such as default router and name server. A DHCP scope 
example is as follows: 

 <pool name> 

 <IP Network> <Netmask> 

 <Default router> 

 <DNS Server> 

Where:

<pool name> is the name of the DHCP pool, such as AP702

<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: 

VCI string” 

For the VCI string, “Cisco AP c702”. The quotation marks must be included. 

Add the option 43 line using the following syntax: 

 <hex string> 

The hex string is assembled by concatenating the TLV values shown below: 

Type + Length + Value 

Type is always f1(hex). Length is the number of controller management IP addresses times 4 in hex. Value is the IP 
address of the controller listed sequentially in hex. 

For example, suppose that there are two controllers with management interface IP addresses, 10.126.126.2 and 10.127.127.2. 
The type is f1(hex). The length is 2 * 4 = 8 = 08 (hex). The IP addresses translate to 0a7e7e02 and 0a7f7f02. Assembling the 
string then yields f1080a7e7e020a7f7f02. The resulting Cisco IOS command added to the DHCP scope is option 43 hex 
f1080a7e7e020a7f7f02.