Description: This table contains a read-only display of the interface stack in indented format. The first row will correspond to one of the system's physical interfaces. The following rows will be in order of which interfaces are stacked on top of which with blank space at the beginning of the xsysIfStackDisplayString values to show the hierarchy. (Note that several rows may be indented to the same level if they are stacked on top of the same lower-layer interface.) When the top of one stack is reached, the next physical interface will start at the left again.