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 ZoneDirector 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 ZoneDirector 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
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.
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 website, such as
http://www.easycalculation.com/decimal-converter.php
, to perform the conversion.
Ruckus Wireless ZoneDirector™ Release 10.0 User Guide
28
Introducing ZoneDirector
Ensuring That APs Can Communicate with ZoneDirector
