Indicates default vlan restore state. There has been a major change to
the usage of this element: it now controls whether or not dynamic VPAs
will be aged on a mobile port. Restore = enable means that aging is
activated; restore = disable means that no VPA aging will occur on this port.
Aging is accomplished by determining that there are no longer any corresponding
layer two source entries for the port.
Non-mobile ports that are potentially mobile do not have this property - a get
returns notApplicable.