provide the portid to the routerinterface 's builder . concode_field_sep String subnetId concode_elem_sep String portId concode_field_sep Builder subnetId concode_elem_sep Builder fromRouterInterface concode_elem_sep Builder toBuilder concode_elem_sep Objects.ToStringHelper string concode_elem_sep String getPortId concode_elem_sep RouterInterface build concode_elem_sep int hashCode concode_elem_sep boolean equals concode_elem_sep Builder builder concode_elem_sep String toString concode_elem_sep Builder portId concode_elem_sep String getSubnetId