This value gives the length, in bits from 1 to 64, of a freeform Generalized Label whose actual content is stored in gmplsFreeformLabel, and it is only meaningful when gmplsLabelSubtype is set to freeformGeneralizedLabel(3). An engineer uses it so the device correctly parses the variable-length freeform label rather than assuming a fixed size. For example, a length of 32 tells the system to read exactly 32 bits from gmplsFreeformLabel as the label's value.