The BGP-4 Received 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 bgpRcvdPathAttrUnknownType indicates a lack of such unknown attribute information for the indicated network path. This table is similar to bgpPathAttrUnknownTable but reports path attributes before import policy has been applied.