This read-create enumerated value indicates whether this circuit is inactive with respect to mesh groups, administratively blocked from flooding LSPs at all, or set as an active member of a specific mesh group, where circuits in the same group form a virtual multiaccess network that suppresses redundant LSP flooding between them. It matters because in a densely meshed topology, unrestricted LSP flooding across every point-to-point link can waste significant bandwidth re-advertising the same link-state information. For example, an engineer running a full-mesh ATM PVC topology between core routers would set csIsisCircMeshGroupEnabled to set(3) on each spoke circuit so an LSP received on one PVC is not needlessly reflooded out every other PVC in the mesh.