@param context - sender context, to match reply w/ request
@param rx_sw_if_index - the interface
@param bd_id - bridge domain id
- @param bvi - Setup interface as a bvi, bridge mode only
+ @param port_type - port_mode, see #l2_port_type
@param shg - Split horizon group, for bridge mode only
@param enable - Enable beige mode if not 0, else set to L3 mode
*/