The extra-dhcp-opt extension is an attribute extension which adds the following set of attributes to the port resource:
extra-dhcp-opt:opt_name - Specified the DHCP option that this is defined as mapped to this port resource. Examples are
bootfile-name,server-ip-address,tftp-server, etc..extra-dhcp-opt:opt_value - Identifies the value associated with the opt_name. These are handled in opt_name, opt_value pairs only. value_opt can be any text string depending upon the name.
The actual semantics of extra-dhcp-opt attributes depend on the name of the dhcp option being used that defines the vendor extension to DHCP. For example reference RFC: http://tools.ietf.org/html/rfc2132, contains specific detail on BOOTP Vendor Extensions.
