. . "A reference to the Segment Routing Local Block (SRLB) that is to\nbe advertised by the IGP instance." . "A definition of a Segment Routing Local Block, defined to be\na set of Segment Identifiers (specified as MPLS labels or\nIPv6 addreses) that are defined for local allocation by the\nsystem. A block may optionally be advertised into an IGP." . . . . .