Cisco Cisco Clean Access 3.5

Enter the text and click Update. 

The Cisco Clean Access DHCP option format is largely compatible with the ISC DHCP server version 
3.x. Many vendors include examples of how to send the required vendor-specific options for ISC DHCP 
server version 3.x.

Option #43 is “vendor-specific options.” That is to say, there is no single option or single option format, 
but rather, a more general formula for entering custom data. There are two formats, one simple (and 
short), the other much more complicated. The following is an example of a specific vendor's use of the 
more complicated format to create options for PXE client boot:

# GLOBAL options:

option space PXE;

   option PXE.discovery-control code 6 = unsigned integer 8;

   option PXE.boot-server code 8 = { unsigned integer 16,

                                     unsigned integer 8,

                                     ip-address };

   option PXE.boot-menu code 9 = { unsigned integer 16,

                                   unsigned integer 8,

                                   text};

   option PXE.menu-prompt code 10 = { unsigned integer 8, text };

# In the scope/ip range section:

   option dhcp-parameter-request-list 60,43;

   option vendor-class-identifier "PXEClient";

   vendor-option-space PXE;

   option PXE.discovery-control 7;

   option PXE.boot-server 15 1 192.160.160.160; # address of server

   option PXE.boot-menu 15 5 "PXEboot";

   option PXE.menu-prompt 0 "PXEboot";

Refer to the man page for dhcp-options or dhcpd-options for additional details.