An SAS domain map is automatically generated at an SAS concentrator switch by a virtual mapping device that presents itself as a target for discovery by SAS devices interfaced with the concentrator, such as information handling systems and storage devices. During the SAS protocol discovery process, the virtual mapping device generates the SAS domain map by acquiring the device name and the device port for each concentrator port that interfaces with a device. A management application running on the concentrator applies the SAS domain map to provide network functions, such as zoning or diagnostics.