@param sw_if_index - interface (if set ip_address is ignored, ~0 means not
used)
@param vfr_id - VRF ID (if ~0 use default VRF)
@param sw_if_index - interface (if set ip_address is ignored, ~0 means not
used)
@param vfr_id - VRF ID (if ~0 use default VRF)