The egress control Label in the explicit route, and its length. At ingress, this value must be inserted as the last hop of the explicit route. At egress this is the value of the received Label subobject. Since 0 is a valid value, the validity of this field is indicated by mplsTunnelUseEgressLabel. When this label is used in signaling protocol messages, it is copied byte for byte as is. Therefore, if the label octet string is intended to represent multibyte values, it should encode those values in network (big-endian) byte order. This interpretation applies in particular to the non-generalized MPLS labels (32 bits) used in ATM, FR and generic MPLS networks.