The Neutron DHCP options extension allows adding DHCP options that are associated to a Neutron Port. They are tagged such that they can be associated from the hosts file to designate a specific network interface and port. The DHCP tag scheme used to associate options to the host files is the port_id (UUID - in the form of 8-4-4-4-12 for a total of 36 characters), these associate options to a Neutron Port and its network. The Dynamic Host Configuration Protocol (DHCP) provides a framework for passing configuration information to hosts on a TCP/IP network. Configuration parameters and other information are carried in tagged data items that are stored in the 'options' field of the DHCP message.
You can specify a DHCP options when defining or updating a Port by specifying the extra_dhcp_opts tag and providing its options as name value pairs e.g. opt_name='bootfile-name', opt_value='pxelinux.0'.
