Configuring DHCP Option 43 on a Linux Server

This section describes the configurations necessary on the Linux DHCP server to use DHCP option 43 for ExtremeCloud IQ Controller discovery. Option 43 requires the following information:

Vendor Class Identifier (VCI) — The VCI for an ExtremeWireless AP or adapter is HiPath <AP model name>. For example, the ExtremeWireless AP3912 is HiPath AP3912 and the SA201 adapter is HiPath SA201.
Option 43 sub-option code — The option 43 sub-option code for the ExtremeWireless APs is type 1 (0x1).
IP addresses of ExtremeCloud IQ Controller

To configure the vendor encapsulated option on a Linux server, you must do the following:

Define an option space.
Define some options in that option space.
Provide values for the options.
Specify that this option space should be used to generate the vendor-encapsulated-options option.

To configure DHCP option 43:

Modify the dhcp.conf file (modifications are in bold).

[root@localhost ~]# vim /etc/dhcpd.conf
authoritative;
ddns-update-style interim;
ignore client-updates;
option space HAP;
option HAP.HWC code 1 = text;

subnet 10.100.1.0 netmask 255.255.255.0 {
range 10.100.1.10 10.100.1.254;
option subnet-mask 255.255.255.0;
option slp-directory-agent false 10.1.100.11;
option domain-name-servers 10.100.1.2;
option domain-name "bpmgmt.com";
option routers 10.100.1.1;
default-lease-time 40000;
}
…
subnet 10.100.4.0 netmask 255.255.255.0 {
range 10.100.4.100 10.100.4.254;
option subnet-mask 255.255.255.0;
option slp-directory-agent false 10.100.4.46, 10.100.4.47;
option domain-name-servers 10.100.1.2;
option domain-name "bpmgmt.com";
option routers 10.100.4.1;
default-lease-time 40000;


Vendor Class for ExtremeWireless APs:

class "HAP" {
match option vendor-class-identifier;
}
subclass "HAP" "AP3935" {
vendor-option-space HAP;
option HAP.HWC "10.100.2.36, 10.100.2.22";


}

Restart the DHCP server.

[root@localhost ~]# /etc/init.d/dhcpd restart