Ruckus Wireless ZoneDirector 1100 User Manual page 27

Configuring the DHCP Server for ZoneDirector-AP Communication
To customize your DHCP server, you need to configure DHCP Option 43 (043 Vendor Specific
Info) with the IP address of the ZoneDirector device on the network. When an AP requests an
IP address, the DHCP server will send a list of ZoneDirector IP addresses to the AP. If there are
multiple ZoneDirector devices on the network, the AP will automatically select a ZoneDirector
to register with from this list of IP addresses.
RFC 2132 describes DHCP Option 60 and Option 43. DHCP Option 60 is the Vendor Class
Identifier (VCI). The VCI is a text string that identifies a vendor/type of a DHCP client. All Ruckus
Wireless Access Points are configured to send "Ruckus CPE" as the Vendor Class Identifier in
option 60, and expect Zone Director IP information to be provided in DHCP option 43 (Vendor
Specific Info), encapsulated with sub-option code 03 (the sub-option code for ZoneDirector).
The RFC describes how vendors can encapsulate vendor-specific sub-option codes (ranging
from 0 to 255). Sub-options are embedded in option 43 as TLV (type, length, value) blocks.
Ruckus Wireless Access points support non-TLV format option 43 values with comma separated
IP address strings for discovering ZoneDirectors, and also TLV based option 43 encapsulation
as specified in RFC 2132.
For Zone Director information (sub-option code 03)
• Type: 0x03
• Length: Count of the characters in the ASCII string. (Length must include the commas if
there is more than one ZoneDirector specified.)
• Value: A non-null terminated ASCII string that is a comma-separated list of ZoneDirector
IP addresses.
For example: If the there are two ZoneDirectors with IP addresses 192.168.0.10 and
192,168.0.20, then the value will be "192.168.0.10,192.168.0.20" and the length is
25 (hex value 0x19).
For FlexMaster information (sub-option code 01)
• Type: 0x01
• Length: Count the number of characters in the ASCII string. (Length must include "http",
plus all colons, slashes and decimals in the complete URL.)
• Value: A non-null terminated ASCII string that is a URL.
For example: If the Flex Master URL is http://192.168.10.1/intune/server, the length
is 33 (hex value 0x21).
You will need this information when you configure DHCP Option 43 for both FlexMaster and
ZoneDirector. To calculate the length field conversion from decimal to hexadecimal, you can
use an online conversion Web site, such as
converter.php, to perform the conversion.
The table below lists the sub-option code, FlexMaster URL and ZoneDirector IP address that
are used as examples in this procedure, along with their lengths in decimal and hexadecimal
values.
Introducing Ruckus Wireless ZoneDirector
Ensuring That APs Can Communicate with ZoneDirector
http://www.easycalculation.com/decimal-
15