@param link_MTU - max. transmission unit
@param sub_if_id - A number 0-N to uniquely identify this subif on super if
@param sub_dot1ad - 0 = dot1q, 1 = dot1ad
@param link_MTU - max. transmission unit
@param sub_if_id - A number 0-N to uniquely identify this subif on super if
@param sub_dot1ad - 0 = dot1q, 1 = dot1ad