Cisco Aironet 1570 Series Installation Manual page 167

Appendix D Configuring DHCP Option 43
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, use the value from
Add the Option 43 line using the following syntax:
Step 4
option 43 hex 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 listed below:
option 43 hex f1080a7e7e020a7f7f02
OL-32138-01
Table D-1. The quotation marks must be included.
Cisco Aironet 1570 Series Outdoor Access Point Hardware Installation Guide
Configuring Option 43 for 1570 Series Access Points
D-3