The BGP-4 Path Attribute Unknown Table contains the per network path (NLRI) data on the path attributes advertised with a route but not known to the local BGP implementation or not otherwise capable of being returned from this agent. The absence of row data for a given index value for jnxBgpM2PathAttrIndex indicates a lack of such unknown attribute information for the indicated network path (as indexed by that jnxBgpM2PathAttrIndex value in the jnxBgpM2PathAttrTable).